KR20190067564A - Real-time detection and recovery system and its construction method in case of power line failure in distribution system - Google Patents

Abstract

Disclosed is a real-time detection and recovery system in a failure of a power line of a distribution system, which immediately performs alarming, blocking, recovery and control when the disconnection, resistance increase, phase sequence, connection failure, semi-disconnection, and leakage occur in a power supply side of a three-phase or single-phase distribution system. The real-time detection and recovery system of the present invention comprises: a power supply side detection and recovery device having a neutral point, and grounding the neutral point to the ground to reduce a potential difference between the neutral point and the ground less than an existing potential difference; a load side detection and recovery device having a neutral point, and grounding the neutral point to the ground, or connecting the same to the neutral point of the power supply side detection and recovery device to recover a power failure of a power supply side in real time; a failure detector for detecting input and output currents of a power line or the neutral point of the load side detection and recovery device, or detecting voltage of the neutral point and the ground to perform alarming, blocking, and recovering, or transmitting a detected failure detection value to a controller; a controller for comparing a detection value provided by the failure detector with a set value to issue an alarm when it is determined that a failure occurs, or to block power, or to transmit the same to a communication module for a wired/wireless notification, and releasing the alarm when an alarm release signal is received; an alarm generator for generating the alarm in accordance with an alarm signal provided by the failure detector or the controller; an alarm release input unit for releasing the alarm of the alarm generator; and a circuit breaker for blocking a failure power in accordance with a blocking signal of the failure detector or the controller.

Description

TECHNICAL FIELD [0001] The present invention relates to a real-time detection and recovery system for a power line failure in a power distribution system,

The present invention detects in real time when an electric fault occurs in a power line of a three-phase or single-phase power distribution system, such as disconnection, resistance increase, image formation, short circuit, short circuit, contact failure, And more particularly, to a real-time detection / recovery system for a power line failure in a power distribution system and a construction method thereof.

Generally, a three-phase four-wire distribution system combines a neutral wire (N) with a power line (R phase, S phase, T phase) by means of Y connection, delta connection and Wiedelta connection. Here, when one power line and another power line are connected to the load, the voltage becomes 380V. When one power line (for example, A phase) and the neutral line (N) are connected, 220V is supplied to the load.

Here, the neutral line (N) means a line in which one line of each phase is common in the multiphase multi-line line. In principle, 6 wires are required to use 3 phase. However, when the phases of the single-phase, two-wire lines are changed by 120 degrees and all the lines are made common, the number of lines is reduced to four, and the potential at one point is commonly zero by the vector sum. This zero potential (zero potential) becomes the reference potential and becomes a so-called N phase, that is, a neutral line.

In this condition, the neutral line should have a zero potential, which is the ground potential in principle, but it may have a slight voltage when the phase of each phase is not exactly 120 ° in the field. In this case, in order to prevent the rise of the neutral potential, if the neutral line is connected to the ground line which is the ground potential line, even if the phase of each phase slightly changes, the ground potential is maintained because it is in contact with the ground.

Here, a single-phase electric line is used by connecting two lines. One of the two lines is connected to a neutral line, which is an equipotential line, and the other line is connected to a power line having a potential difference of 220V to the ground. If a short circuit (earth fault) occurs, it may result in electric shock or fire.

In addition, when the neutral point of the power supply side to which the single phase loads are commonly connected is disconnected, the unbalanced load connected to the unbalanced single phase load connected to the other three phase phases causes the abnormal voltage to flow into the light load. And the image harmonics flowing into the neutral line also cause an electric accident. In order to prevent this, a wiring breaker and an earth leakage breaker are installed.

A molded case circuit breaker is usually housed in a molded case to protect against overload and short circuit of the wiring. The molded case circuit breaker is a molded case circuit breaker that is used for protecting the wiring in a low voltage indoor voltage circuit of less than 600 V AC or 250 V DC Mold case circuit breaker. In general, the circuit breaker is also referred to as the MCCB (peculiar).

In addition, the earth leakage breaker detects the leakage current of about 5-30mA to prevent electric shock. However, most fuses and wiring breakers operate with a large current of about A to prevent electric shock due to small leakage current. It is necessary to prevent the electric shock from being transmitted to the heart so that the leakage current of about 5-30mA is cut off within 25-40 millisecond time. The leakage current which is the cutoff standard is different according to the country and region. In Korea, And the leakage current is within 50mA if the rated current of the earth leakage breaker is 100A.

A general earth leakage circuit breaker measures the difference between the current flowing through the power line and the current flowing through the neutral line. If the sum of the current flowing in and the current flowing in is not zero, it means that there is a short circuit somewhere. And the circuit breaker which cuts off the large current is complementary to each other. The circuit breaker only for the leakage current can not prevent the overload or the short circuit. Therefore, the circuit breaker is mostly used for the overcurrent (short circuit).

In addition, an earth leakage breaker with a leakage break current of 500 mA or more is installed in an environment such as a data center that can be accidentally operated when the breaking current is low. These earth leakage breakers are installed for fire prevention rather than electric shock.

However, electric fires are not decreasing every year, and most of the fires are generated in the low-pressure rooms due to the poor electric facilities of the low-voltage consumers rather than the high-voltage customers. Electric fires are generated by supplying the disconnected electricity from the power source, If an abnormal voltage, such as a surge, is supplied, the low-voltage customer can not take any measures against the abnormal voltage input, so that an abnormal voltage flows into the load of the consumer, Electric fire is generated.

In addition, from the entrance of the low-pressure building to the distribution center where the breaker is installed, there is a blind spot for monitoring the electric fault such as a short circuit. If a short-circuit accident occurs here, There are various causes of fire, and the major factors are as follows.

First of all, with the short circuit, the shell of the electric wire is peeled off, or the heavy wire is placed on the wire which can be fixed with the nail, pin or the like to the electric wire, and the two strands of the electric wire are directly or indirectly contacted with each other, (Short-circuit) phenomenon occurs at this time, the flame is generated by the contact between the conductors, which leads to a fire.

The overload is caused by excessive use of electricity in excess of the rated capacity, unbalanced current, excessive heat at the connection of the electric wire or the electric appliance itself or the wiring device, and the electric power is generated by the fire.

The unbalanced voltage is caused by a fault in the balanced load (three-phase motor, etc.), failure of the load device, failure of the load device, disconnection of the neutral line of the unbalanced single-phase load of three-phase or four- The overload current of the load is protected by the electronic overload relay (EOCR) to some degree. However, if the motor starts up at the initial start-up (delay time) and the phase failure occurs in the control power supply or if the neutral line is disconnected, the overload relay The protection is not easy beyond supply. Particularly, when the neutral wire is disconnected from the power supply side system of the single-phase two-wire type, the relay is disabled due to power outage, the electric cable is shorted and the electric power is shorted, Even if a fire or an overheating occurs, no measures can be taken to prevent the breakdown of electricity.

In the case of a short circuit, electricity flows to the outside through an object other than a wire through which electric power flows. Leakage fires flow to a building or an auxiliary facility without passing through a portion designed for a current path, and heat accumulates.

The connection failure and the half disconnection are caused when the connection point (branch of the circuit) of the wire or the inner conductor of the wire is disconnected and connected or disconnected repeatedly and resistance is generated and the current flow is obstructed. And the +, - electrodes, which are conductors of the electric wire, are collided to cause a fire.

In addition, when the resistance of a conductor is increased due to carbonization (deterioration) or the like, an overheat may cause an electric fire due to an overcurrent, overvoltage, or unbalanced power due to occurrence of electric shock, fire or overheating, However, since there is no technology for detecting a conduction abnormality such as carbonization (deterioration), the latest inspection method depends on the naked eye of an electric engineer. In this case, only the connection failure which can detect a part is explained.

As such, the causes of electrical fires are diverse. Because the causes of fire in each cause are different from each other, the methods used to detect them are also different, and the types of protective relays are also various.

As an example of detecting a connection failure, an apparatus for detecting a connection failure and an electrical abnormality conventionally detects a connection failure by detecting a temperature, detecting a voltage and a current change, a harmonic change (VTHD, ITHD) Such a conventional technique requires various electrical quality elements to be measured, a temperature sensing device or the like must be separately installed, and an electrical phenomenon that is caused when a connection failure occurs is not accurately analyzed and discriminated.

In other words, the conventional technique of detecting through harmonic variation is that VTHD and ITHD are seriously increased when a customer uses a welding machine and an arc load, and even if the value is in a steady state depending on light load, heavy load and peak load, It is not sure whether it is due to connection failure.

Also, in the conventional technology for detecting connection failure from one factor of voltage value or current value, when the voltage and the current source are separated (customers supplied separately by PT and CT), there is a limit to judge connection failure have.

When the fault accumulates for a certain period of time, the temperature rises and the sheath (insulation material) of the wire is carbonized and softened. Finally, That is, the +, - electrodes which are the conductors of the electric wires collide with each other, so that the electric power meter is burned down and the electric fire continues.

Concretely, as the resistance of the contact surface increases due to the connection failure of the electric wire, the heat of the conductor (electric wire) connection surface rises, and the heat of the raised high temperature damages the insulation between the conductors (electric wires), causing a short circuit between the conductors. In addition, arcing occurs due to contact between the conductors, and the arc heat causes the appliance to be burned and further spread to the electric fire.

Up to now, the development and dissemination of equipment capable of preventing electrical accidents and fires caused by short circuits, overcurrents, short-circuiting, and short-circuiting occurring on the load side of the breaker (breaker) have been made common, but carbonization, deterioration, resistance increase, A breaker (switch) that can accurately detect or shut off when a neutral wire breakage, a power wire image breakdown, an unbalanced abnormal voltage input, a half wire breakage, a connection failure, or a wrong wiring, short circuit, short circuit, It is absent.

That is, many techniques for detecting a short circuit (short circuit), a short circuit (ground fault), and an overload on the load side have been developed. However, there is a problem in that the power supply side and the load side are subject to carbonization, deterioration, resistance increase, There has not been developed a technology that can precisely detect the electric fault when an unbalanced abnormal voltage input, a disconnection, a connection failure, or a mis-wiring, a short circuit, a short circuit, In case of KEPCO, it is necessary to check the distribution lines with a lot of people and budget by infrared (thermal image) camera in order to find the connection failure distribution line.

Therefore, there is a risk that the charger, deterioration, resistance increase, overheat, neutral wire disconnection, power line image disconnection, unbalanced abnormal voltage input, half disconnection, connection failure occur on the power source side and the load side, ), It is more urgent than ever to be able to prevent the electric appliance from burning down, electrical fire, electric shock, and human accidents due to electric failure.

In order to solve all of the problems caused by the connection failure and image formation, disconnection, unbalanced overvoltage, and overcurrent, conventionally proposed techniques are disclosed in Korean Patent Application Publication No. 10-2009-0004718 (published on Jan. 12, 2009) (Hereinafter, referred to as 'Prior Art 1'), Korea Patent Office Registration No. 10-1109024 (Registered on Jan. 17, 2012) (Name of invention: detection of contact failure of a watt hour meter) (Hereinafter, referred to as 'Prior Art 2'), Korean Patent Registration No. 10-1320373 (Registered on Oct. 15, 2013) (Name of invention: Image reconstruction apparatus equipped with a transformer and its installation method) (Hereinafter, referred to as 'Prior Art 4'), Korean Patent Application Publication No. 10-2015-0128124 (entitled "Overcurrent Relay") .

The disclosed 'Prior Art 1'

It is possible to protect the user from the risk of fire by detecting the contact failure by the change of current rms value, power factor, current instantaneous value, harmonics, etc., and by cutting off the power accordingly, and there are five factors It is possible to detect a contact failure more accurately by making a determination that the contact failure is caused when two or more factors of the contact failure are satisfied and further to inform the user terminal about the blocking situation due to the contact failure, .

The disclosed 'Prior Art 2'

A power factor calculator for calculating a power factor value in units of a total measurement time and a measurement time set based on the detected voltage and current values and a voltage and current detector for detecting a voltage and a current supplied to a customer, A contact failure judgment unit for judging that the contact failure is judged to be a contact failure when the power factor value calculated in units of measurement time is continuously decreased in a range smaller than a predetermined reference value and a contact failure signal when it is judged as a contact failure by the contact failure judgment unit And an interface unit for transmitting the electric power to the remote server. In addition, it is configured to prevent contact failure of the watt hour meter and to prevent burning of the electric device (watt hour meter) due to contact failure.

The disclosed 'Prior Art 3'

In the 3-phase 4-wire distribution system, it is detected when the unbalanced fault recovery current occurs in the phase line of the power line, the disconnection of the neutral line, and the power line and the neutral line, and recovery of normalization of power line image, disconnection of neutral line and power unbalance, So as to maintain normal power.

The disclosed 'Prior Art 4'

In order to solve the problem of the relay malfunction due to the normal load fluctuation which is the limit of the conventional art of the overcurrent relay, it is determined whether there is a normal load fluctuation when the load fluctuates, It is possible to perform proper relay operation according to the load condition, to prevent the relay malfunction caused by the normally added load, and to provide stable and reliable line protection and system operation.

1. Published Patent Publication No. 10-2009-0004718 (Dec. 1, 2009) 2. Patent Registration No. 10-1109024 (Registered on January 17, 2012) 3. Registration Patent Registration No. 10-1320373 (Registered on October 15, 2013) 4. Published Patent Publication No. 10-2015-0128124 (published Nov. 11, 2015)

However, the above-mentioned conventional technology has a problem in that if there is carbonization, deterioration and increase in resistance of the power distribution system, there is no way to detect it immediately, which causes electric shock, overheating, fire, there was.

In addition, if an abnormality of the converter occurs due to a broken wire, a phase failure, an unbalanced abnormal voltage, a disconnection, a connection failure, or a malfunction, a short circuit, a ground fault or a short circuit on the power supply side, There is a problem in that the switch may not be operated due to a malfunction of the switch which must be opened and closed automatically to prevent an electric accident.

In addition, voltage, current, waveform, harmonics, leakage current (voltage), current, waveform, harmonics, and leakage current are generated when a power failure occurs due to a short circuit (short circuit), disconnection, image formation, connection failure, The system and algorithm for detecting each electric failure are different and there is a problem that the reference value setting is difficult to operate or can not be detected.

In addition, electric faults such as short circuit (ground fault), disconnection, phase failure, connection failure, half disconnection, erroneous connection, short circuit, abnormal voltage inflow, etc. on the power supply side of low voltage switchboard, The circuit breaker and the earth leakage circuit breaker which can not detect the electric fault at the time of occurrence can not be operated at all and the abnormal voltage such as the unbalanced overvoltage is inputted into the customer without any control and the electric shock of the electric device, There was a problem to give.

In addition, if the protective relay does not supply the control power for executing the system operation and the algorithm separately, malfunction or malfunction of the system may occur due to abnormality of the control power due to electrical failure such as disconnection of the control system, There is a problem that electric fire, electric shock, equipment burnout, human accidents occur.

Also, in case of electrical failure due to ground fault (short circuit), disconnection, phase failure, connection failure, half disconnection, erroneous connection, short circuit, abnormal voltage inflow, etc. in the power supply side power supply system supplied to the customer, (OCGR, OCR, OVR, UVR, POR, etc.) according to the failure of the protection relays, and even if the protection relays are all provided, the ground fault, short circuit, , A short circuit (short circuit), an abnormal voltage input, or the like, malfunctions and malfunctions occur when the control power supply of the protection relay fails.

In the three-phase four-wire power distribution system, which is the power supply side of single-phase, two-wire type, abnormal voltage is introduced at the neutral line disconnection or interrupted due to the failure of the control power supply of the breaker There is a problem that electric leakage or fire or personal accident occurs when electric leakage occurs or when an abnormal voltage flows into a consumer using light load (electricity consumption saving).

Therefore, a real-time detection / recovery system is required in case of power line failure of power distribution system that immediately alerts, intercepts, and real-time recovery in the case of disconnection, resistance increase, contact failure, (R, S, T, N) or a single-phase two-wire system (RN, SN, TN) or the like in order to solve the problems in the conventional power distribution system. In the event of line break, resistance increase, contact failure, semi-disconnection, or short circuit, these abnormalities are immediately alarmed, interrupted, and restored in real time to prevent accidents such as power failure, electric shock, equipment burnout, fire, overheating, This paper proposes a real-time detection / recovery system and its construction method in case of power line failure in power distribution system.

According to an aspect of the present invention, there is provided a system for preventing a power failure, an electric shock, and a fire accident caused by a disconnection, an increase in resistance, a contact failure, a disconnection,

The power supply side detection / recovery device includes at least one power supply side detection / recovery device and a load side detection / recovery device in the power distribution system, wherein the power supply side detection / recovery device forms a neutral point in the middle of the power output coil, grounds the neutral point to the ground, And the power supply line of the single-phase or three-phase power supply performs at least one of abnormal voltage input, image formation, disconnection, connection failure, recovery in case of increase in resistance, interruption, alarm, notification,

The load side detection / recovery unit may be configured to configure a neutral point in the middle of the power output coil so that the neutral point is grounded to the ground or connected to the neutral point of the power supply side detection / recovery unit, or a potential difference between the neutral point and the ground is detected, And the control circuit performs at least one of an abnormal voltage input, an image forming operation, a disconnection, a connection failure, and a recovery, interruption, alarm, notification and control at the time of increasing resistance.

Meanwhile, in another embodiment, the power source side detector / restorer includes a first leg, a second leg, and a third leg which may include a primary coil and are iron cores; And a first winding, a second winding, and a third winding, which are secondary coils. Wherein the first winding is wound on the first leg, the second winding is wound on the second leg, the third winding is wound on the third leg, and the first winding, the second winding, The three-phase power source supplied to the load from the secondary coil is supplied at a value three times the root of the ground potential difference, the single-phase power source is supplied at half the ground potential difference, and the power is supplied from the load side And recovering the magnetic flux from the coil.

The power source side detector /

Even if R or S phase or T phase or neutral line (N) is disconnected or frayed from the power supply side due to lightning, short circuit, short circuit, ground fault, fuse disconnection in the power distribution system, And the ground potential difference of the single-phase power source is reduced to prevent electric shock and fire from occurring due to a short circuit (ground fault).

In the above, the load side detection /

The neutral point of the load side detector / restorer is grounded to the ground and composed of a single-phase power supply line, which prevents the short-circuit accident by the line, reduces the leakage current, reduces the line fault, do.

In the above, the load side detection /

When the neutral point of the load side detection / recovery device is connected to the neutral point of the power source side detection / recovery device, if an electric failure occurs due to a disconnection or a contact failure, a disconnection or a short circuit (ground fault) / Electrical generator at the power line or the neutral point of the recoverer, and transmits the electric signal to the fault detector.

The power source side and the load side detection /

Phase or three-phase power source, and the neutral point is grounded to the ground, or the potential difference between the neutral point and the ground is detected, or a current flowing through the neutral point and the ground is detected, The power supply line of the three-phase power supply performs at least one of abnormal voltage input, phase loss, disconnection, faulty connection, recovery, interruption, alarm, notification and control when the resistance increases.

In the above electronic device,

A resistor or capacitor or varistor or silicon or germanium or carbon or a coil or an integrated circuit or a relay or a contactless relay SSR ) Or a trip coil.

Wherein the failure detector comprises:

The abnormal voltage is detected by detecting an electric signal generated when the power line or the neutral point provided at the input or output line of the power source side or the load side detector / The alarm is generated through the alarm generator, the alarm is interrupted through the circuit breaker, the control is performed through the controller, or the real-time restoration is performed through the power source side or the load side detection / recovery device.

Wherein the failure detector comprises:

An electronic relay (SSR), a video current transformer, a voltage detector, a current detector, a relay, or a trip coil is used for detecting a fault generating electrical signal output from the neutral point or the power line.

The power source side detector /

The neutral point of the output voltage of the power supply side detector / restorer is grounded to the ground, and the potential difference between the power supply line and the ground is lowered and the potential difference is maintained at a constant potential (for example, 110 V) Thereby preventing the occurrence of an electric shock or a fire accident due to the occurrence.

The power source side detector /

It is connected to three-phase four-wire or single-phase three-wire distribution system to block the source of image harmonics introduced into the neutral line by the nonlinear single-phase load in the distribution system and prevents unbalance overvoltage inflow when the neutral line is broken. .

The power source side detector /

It is connected to the three-phase four-wire power distribution system to recover real-time three-phase power even when one of the fuse breaks, line breakage, transformer failures, equipment failures, and neutral breaks are disconnected from the power source. So that the power source of the single-phase power source is prevented from origin.

In this case, the real-time detection /

A power supply side detection / recovery unit having a first neutral point and grounding the neutral point to the ground to reduce the potential difference with the earth from the existing potential difference; A load side detection / recovery unit having a second neutral point and grounding the neutral point to the ground or connecting the neutral point of the power source side detection / A fault detector for detecting input / output currents of a power line or a neutral point of the load side detector / restorer, detecting a voltage of the neutral point and the ground and alerting or shutting off or transmitting a detected fault value to the controller; A controller for comparing the detection value provided by the fault detector with a set value to deliver an alarm to the communication module to notify an alarm, a power supply, or a wired / wireless connection when a fault is detected; An alarm generator for generating an alarm according to the alarm signal provided by the fault detector or the controller; An alarm release input unit for canceling an alarm notification of the alarm generator; And a breaker for shutting down the faulty power supply according to the fault signal from the fault detector or the controller.

According to another aspect of the present invention, there is provided a method of constructing a real-time detection / recovery system in a power line failure of a power distribution system,

Installing at least one of a power side detection / recovery device and a load side detection / recovery device in a three-phase or single phase existing power distribution system; A neutral point of the power source side detector / restorer is connected to the ground or connected to the neutral point of the load side detector / restorer, or a neutral point of the power source side detector / Installing a detector; A failure detector is connected to the neutral point of the load side detector / restorer to ground or to the neutral point of the power detector / repairer or to detect the neutral point and ground of the load side detector or the current flowing through the neutral point and the ground. Installing; Connecting the winding of the output coil of the power source side detector / breaker to the load or electrically connecting the winding of the output coil of the power source side detector / breaker to the winding of the input coil of the load side detector / breaker; The input power side coil winding of the power supply side detection / recovery device is electrically connected to a three-phase or single-phase power supply line of the existing power distribution system to provide a single phase of the power supply side detection / recovery device, power supply device, or power supply side detection / Or disconnecting, disconnection, connection failure, recovery upon increase in resistance, interruption, alarm, notification, and control in a power supply system of a three-phase power supply.

According to the present invention, it is possible to prevent a power failure by preventing a power failure by real-time restoration by normal power when a power source side supplied from a single-phase two-wire system, a single-phase three-wire system or a three-phase three- can do. As a result, it is possible to prevent the occurrence of personal injury due to increase in resistance of the power source side, carbonization, deterioration, image formation, breakage, contact failure, electric leakage due to short circuit,

In addition, in case of single-phase 2-wire, single-phase 3-wire, 3-phase 3-wire or 3-phase 4-wire power distribution system, The electric faults can be quickly repaired, thereby preventing the accident from spreading.

In addition, it has a neutral point in a single-phase power distribution system and can suppress the occurrence of electric shock and fire accident due to a neutral line failure and a power line short-circuit (ground fault) by lowering the electric potential against the ground of the power line.

1 is a block diagram of a conventional single-phase two-wire distribution line.
FIG. 2 is a block diagram of a real-time detection / recovery system 200 when a power line failure occurs in the power distribution system of the present invention. FIG.
Fig. 3 is a circuit diagram of the embodiment of Fig. 2 when the power source is a single-phase, two-wire type.
Fig. 4 is a circuit diagram of the embodiment of Fig. 2 when the line of the restoration power distribution system 150 is constituted by one line, which is a modified embodiment of Fig.
FIG. 5 is a circuit diagram of the embodiment of FIG. 2 when the power source is a single-phase three-wire type.
FIG. 6 is a schematic diagram of a circuit diagram of FIG. 2 when a three-phase three-wire or four-wire power source is in operation and a method 150 for constructing a real-time detection / recovery system in a power line failure of a power distribution system according to a preferred embodiment of the present invention.
7 is a circuit diagram of various embodiments of a power side detector /
FIG. 8 is a vector road for explaining the power recovery principle (order) when a three-phase three-wire or three-phase four-wire power source side detector /
Vector 241-a also shows the phase vector when the power supply side detector /
The vector 242-b also shows the recovery order vector when the input power source S phase is disconnected,
243-a shows a recovery order vector when the input power source R is broken,
242-b is a recovery order vector when the input power source T phase is disconnected and phase-wise.
9 is a configuration circuit diagram for detecting fault lines of a single-phase (2-wire, 3-wire) or three-phase (3-wire, 4-wire)
FIG. 10 is a circuit diagram of a real-time detection / recovery system in a power line failure in a power distribution system according to a preferred embodiment of the present invention when the power source is a single-phase (2-wire, 3-wire) or a 3-wire (3-wire or 4-wire)
11 is a circuit diagram of various embodiments of the load side detector /

The present invention provides a real-time detection / recovery system for a power line failure in a power distribution system, comprising: a power supply side detection / recovery unit having a neutral point and grounding the neutral point to the ground to reduce a potential difference with the ground from an existing potential difference; A load side detection / recovery device having a neutral point and grounding the neutral point to the ground or connecting a neutral point of the power source side detection / A fault detector for detecting input / output currents of a power line or a neutral point of the load side detector / restorer, detecting a voltage of the neutral point and alarming or shutting off or transmitting a detected fault value to the controller; A controller for comparing the detection value provided by the fault detector with a set value to deliver an alarm to the communication module to notify an alarm, a power supply, or a wired / wireless connection when a fault is detected; An alarm generator for generating an alarm according to the alarm signal provided by the fault detector or the controller; An alarm release input unit for canceling an alarm notification of the alarm generator; And a breaker for shutting down the faulty power supply according to the break signal of the fault detector or the controller. Will be described more specifically with reference to the drawings.

2 is a block diagram of a real-time detection / recovery system 200 when a power line failure occurs in a power distribution system according to a preferred embodiment of the present invention.

1), which is provided in a power distribution system (for example, Fig. 1) of a conventional single-phase or multi-phase polynomial (for example, 300). ≪ / RTI > It has a neutral point (first neutral point) that is grounded on the earth itself, and functions to lower the potential difference with the earth than the existing potential difference.

And a load side detector / breaker 230 connected to the load side line of the power distribution system. This has its own neutral point (second neutral point), which is grounded to the earth or connected to the first neutral point of the power source side detector / breaker to provide a real-time recovery of the power source electrical fault.

- Fault detector (210) that detects the disconnection of the power source side, the contact failure, the disconnection, and the occurrence of the short circuit by interlocking with the load side detector / Output current of the load side detector / restorer or the input / output current of the second neutral point or detects the failure by detecting the voltage of the second neutral point and transmits the detected failure detection value to the controller.

An alarm generator 250 for alarming the occurrence of faults detected by the fault detector 210 or by the controller as visual and / or audible alarms.

- An alarm cancellation input device (260) which receives a signal for canceling the generated alarm (for example, when the alarm release switch is operated) and generates an alarm release signal.

A breaker (270) which breaks the power supply side and the load side of the power distribution system according to the detection of a fault by the fault detector (210) or according to a shutoff signal of the following controller.

- outputting an alarm or shut-off signal for operating the alarm generator (250) or the breaker (270) by determining the failure of the power distribution system from the output of the fault detector (210) (220).

Hereinafter, the details of each component of Fig. 2 will be described with reference to specific embodiments with reference to Figs. 3 to 6. Fig. 3 is a circuit diagram of an embodiment of a real-time detection / recovery system 200 in the case of a single-phase power distribution system power line failure, which is the embodiment of FIG. 2 for a single-phase, two- Fig. 4 is a circuit diagram of the embodiment of Fig. 2 when the line of the restoration power distribution system 150 is composed of one line as a modified embodiment of Fig. 3, which is a single-phase two- 2 is a circuit diagram of an embodiment of the present invention. Fig. 6 is a circuit diagram of the embodiment of Fig. 2 in the case of a three-phase four-wire type incoming power source.

The power source side detector / restorer 240 is connected to the power source side to receive power from a main voltage transformer (e.g., 300 in FIG. 1) of the power distribution system (e.g., FIG. 1) (The first neutral point N1) and serves to lower the potential difference with the ground than the existing potential difference.

3, the power supply side detection / recovery unit 240 includes a primary coil L5 connected to the R phase single phase power output of the main transformer 300 and a primary coil L5 connected in series with the primary coil L5 And two secondary coils L3 and L4. A first neutral point N1 is formed between two serially connected secondary coils L3 and L4 and grounded. In fact, the secondary coils L3 and L4 are one coil, and the center tap in the middle may be grounded to the first neutral point N1. In the power source side detector / restorer 240 of the embodiment of FIG. 3, one load power supply line R2 is connected at the connection point between the primary coil L5 and the secondary coil L3, and the end of another secondary coil L4 connected to the secondary coil L3 Another load power supply line (R1) comes out of the brakes and constitutes a restoration power distribution system (150).

4, the power supply side detection / recovery unit 240 includes a primary coil L5 connected to the R phase single phase power output of the main transformer 300 and a secondary coil L5 connected in series to the primary coil L5. And a coil L3. The end of the secondary coil L3 connected in series is constituted by the first neutral point N1 and is grounded. One load power supply line R1 is formed at a connection point between the primary coil L5 and the secondary coil L3 to constitute a recovery power distribution system 150. [

In addition, the configuration of the power supply side detection / recovery unit 240 in the single-phase three-wire power supply embodiment of FIG. 5 is the same as that of FIG. However, N1 itself is not grounded, but comes out of the third load power supply line N along with the other two load power supply lines R1 and R2 to form the recovery power distribution system 150. [

6, the three load power supply lines R1, R2, and N constitute a recovery power distribution system 150. The power supply side detection / recovery unit 240-a is a three-phase four- .

If the power supply voltage of the existing three-phase four-wire (R, S, T, N) or single-phase (RN, SN, TN) power distribution system is 220 V, the power detector / Is 220V. Here, the primary coil of the power source side detector / restorer 240 (or 240-a of FIGS. 6 to 8) is supplied with either three-phase 380 V or single-phase 220 V power. Wind the secondary coil according to the transformer ratio to transform the supplied power to the actual power source. An intermediate tap or a first neutral point N1 is formed in the middle of the secondary coil winding and the neutral point N1 is grounded to the ground E to secure the power supply line of the recovery power distribution system 150, Is lowered to 110V. Here, it is preferable that the transforming ratio of the windings L3 and L4 of the secondary coil of the power source side detecting / recovering devices 240 and 240-a is 1: 1.

This power source side detector / restorer 240 can reduce the risk of electric shock even when a short circuit (ground fault) is caused by lowering the potential of the single phase supply power source to 110 V and can eliminate the neutral line commonly used in the power distribution system having an unbalanced single- The source of the abnormal voltage introduced by the unbalanced load due to the disconnection of the neutral line is cut off. Thus, the reliability of the restoration power distribution system 150 can be ensured, and in particular, even in the single-phase three-wire type, it is possible to recover in real time even if the neutral line is disconnected, thereby preventing electric shocks caused by the neutral line from being transmitted through the load side detection / can do.

Next, the load side detection / recovery device 230 connected to the load side will be described.

3, the load side detector / restorer 230 is connected to the two lines R1 'and R2' that are supplied to the load, and is connected to each of the coils L1 and L2 (or one coil (Center tap of L1-L2) is grounded by forming a second neutral point N2.

3 is similar to the load side detection / recovery device 230 of FIG. 3, but the load side detection / recovery device 230 of FIG. 4 is similar to the load side detection / (150). In FIG. 4, one or more load detecting / recovering devices 230 are connected in parallel to perform a redundancy function.

5, the load side detector / restorer 230 is connected to the two load power supply lines R1 'and R2' at the rear end of the circuit breaker 270 as in the case of FIG. 2 and the second neutral point N2 thereof is connected to the third load power supply line And is connected to the load power supply line N '.

In FIG. 6, two load side detectors / recoverers 230 are located at the front end of the breaker 270, and the left side shows the second neutral point N2 at the power source side detector / ), And the right side grounds the second neutral point (N2) similarly to the case of Fig.

Next, the failure detector 210 detects a current flowing through the coil L1-L2 of the load side detector / restorer 230 or a voltage between both ends thereof, using the current / voltage detector, or detects the current flowing through the second neutral point N2 and the ground E). In this case, the controller (220 in FIG. 2) compares the detection value detected by the failure detector 210 with the preset value preset in the controller 220 to determine whether the failure has occurred. If the failure is determined, To output a trip signal. The trip signal may be designed to be output from the fault detector 210 as shown in FIG. 2 or may be designed to be output from the controller 220.

In another embodiment, if the failure detector 210 is implemented as a contactless relay (SSR), it is possible to detect a disconnection of a power supply line and to cause the controller 220 to detect disconnection and output an alarm or shutdown signal .

The operation of the real-time detection / recovery system 200 in the case of the single-phase power distribution system power line failure shown in Figs. 3 to 5 will now be described in detail.

The power source side detector / restorer 240 comprises a coil and an iron core for voltage transformation of a single-phase power source and outputting the voltage. The potential difference of the single-phase two-wire power supplied from the power source side detector / restorer 240 and supplied to the earth E by grounding the neutral point N1 is formed in the middle of the winding of the output coil Reduce to half compared with the existing power supply, greatly reducing electric shock and fire accident caused by ground fault (short circuit). In addition, since the neutral line (N) of the general distribution system commonly used in a general single-phase load is not used, it is possible to prevent the inflow of the abnormal voltage by the neutral line and to prevent the risk of fire due to disconnection of the neutral line. (However, even if the neutral wire is used in the single-phase three-wire type of Fig. 5, the neutral voltage is immediately recovered from the load side and the abnormal voltage is not generated).

The real-time detection / recovery system 200 in case of such a single-phase power distribution system power line failure includes a load side detector / restorer 230 on the load side converter to the power distribution line 150 of the recovery power distribution system 150. A second neutral point N2 is formed in the input or output coil of the load side detector / restorer 230 for recovering, interrupting, alerting, or notifying when the power line supplied from the power source side detector / , The second neutral point N2 is grounded to the ground E or the second neutral point N2 is electrically connected to the first neutral point N provided in the power supply side detector / This allows real-time recovery of single-phase, two-wire or single-phase, three-wire power supplies when disconnected, faulty, or broken. Alternatively, the fault detector 210 can detect the occurrence of a fault voltage or a fault current flow on a power line or a neutral point at the time of a disconnection, a contact failure, a disconnection, a short circuit, or the like.

The second neutral point N2 of the load side detector / recoverer 230 electrically connected to the first neutral point N1 of the power source side detector / restorer 240 becomes a neutral line in the single phase three wire type, When the line break occurs on the power supply side, the alarm is immediately activated or shut off or restored. When the second neutral point (N2) electrically connected to the first neutral point (N1) is used also in the single-phase two-wire system, a short circuit current is dispersed and flowed at short- It is possible to increase the reliability of the apparatus.

The load side detector / restorer 230 also forms a second neutral point N2 in the middle of the input and output coils of the power source to generate the second neutral point N2 Ground or connected to the first neutral point (N1) of the power supply side detection / recovery unit (240). When the disconnection, the contact failure, the disconnection, and the short circuit are occurred in the electric lines (R1, R2, etc.) of the recovery power distribution system 150, the second neutral point N2 is operated so that it can be recovered, will be.

In this case, when the power line is disconnected from the power line, only one line is left as the power line. When the power line R2 is connected to the load detection / And supplies power to the coil L2. The coil L2 is electromagnetically induced in the coil L1 in conjunction with the ground E connected to the second neutral point N2 of the load side detector / When the wire R2 is disconnected, only one wire R1 is present in the restoration power distribution system 150 and the existing wire R1 supplies power to the coil L1 of the load side detector / The first coil L1 is electromagnetically induced in the coil L1 by maintaining a potential of 110 V with the earth E connected to the second neutral point N2 of the load side detector / do. In case of contact failure or half-breaking, real-time restoration is possible for the above reasons.

Phase single-phase three-wire system, the same principle is restored by using a neutral point in place of the ground E as in the single-phase two-wire system, so that detailed description of the single-phase three-wire system will be omitted. As a result, it is obvious that normal electric use works even if a single-phase power line is constituted by one line like the circuit shown in FIG.

When a short circuit occurs in the lines R1 and R2 of the recovery power distribution system 150, a leakage current flows only in the short circuit and leakage current is supplied by the recovery power of the load side detector / The leakage current can be detected by monitoring the input / output line of the load side detector / restorer 230 by the video current transformer or by monitoring the ground (E) line connected to the N2 terminal of the load side detector / . Alternatively, it is also possible to detect only the short circuit voltage by connecting the N2 terminal of the load side detector /

If the voltage is detected without connecting the N2 terminal of the load side detector / breaker 230 to the ground, the voltage can be detected at the N2 terminal and the ground E even in the case of disconnection, contact failure, A leakage current is detected at line R1 or R2. When the voltage is detected at the N2 terminal and the ground E, the controller 220 determines that the electric current is short-circuited (ground fault), and issues a cutoff or notification (alarm). If a voltage is detected at the N2 terminal and the ground E without detecting a leakage current at the line R1 or R2, the controller 220 determines that a disconnection, a contact failure, E), and performs a function of transferring an electric signal so that the breaker or the alarm or the communication module operates.

Now, with reference to Figs. 6 to 8, the disconnection and image restoration in the case of a three-phase four-wire power source will be described. 6 and 7, the power source side detector / restorer 240-a includes windings P1, P2, P3, and P4 wound with 1: 1 voltage ratios and legs 120, 130, And the single-phase lines R1 and R2 of the recovery power distribution system 150 connected to the intermediate tap.

7 shows various embodiments of the power source side detector / 240-a represents a power source side detector / restorer used in the three-phase four-wire system of FIG. 6, and 240-b represents another embodiment of the power source side detector / And 240-c represent another embodiment of the power source side detector / restorer 240 of FIG.

8, the steady state vector diagram 241-a of the power source side detector / restorer 240-a and the recovery vector diagrams 242-a, 242-b, and 242-c at the time of disconnection and image formation are described have. See Figure 8 for a description of recovery. 11 of the vector diagram 242-a is a vector diagram of the state in which the input S phase is extinguished. When the input S phase is extinguished, the power of the coil winding P1 disappears and only the input R phase, the input T phase, and the neutral line N, which maintain the phase angle of 120 degrees with each other, The voltage on the input R is connected to the other end of the winding (coil) P2 connected to the winding P1 and the winding P4 wound on the same leg 140 as the third leg 140 wound with the winding P2 in the direction opposite to the winding P2 A phase voltage in the direction opposite to that of the voltage induced in the winding P 2 by 180 degrees with respect to the neutral point N is generated by the electromagnetic induction in the winding P 4 and a phase vector in the state 242-a (11) appears. On the other hand, the input T phase having a phase difference of 120 degrees with the input R phase and having a 380V potential difference and a neutral line N and a 220V potential difference is connected to one end of the winding P3 so that the power is turned on and the voltage of the phase generated in the winding P4 is A voltage equal to the phase of the phase of the input S, which has been lost in the winding P3, is applied to the other end of the input R having the phase difference from the input T to the other end connected to P3, A phase vector appears. Further, the winding P3 causes electromagnetic induction to generate a reverse phase voltage of the phase of the winding P3 with respect to the winding P1 wound in the opposite direction in the same leg 120 in which the winding P3 is wound, so that one end is connected to the neutral point N The connected winding P1 generates a discon- nected power input S phase that is 180 degrees opposite to the phase of the winding P3 on the basis of the neutral point to restore the input S phase.

8, only the input R phase, the input S phase, and the neutral wire N are supplied to the coil windings P1 and P2, so that the coil windings P2 are supplied to the same legs 140 And the coil P3 is electromagnetically induced by the coil winding P1 wound around the same leg 120 as the input S phase to recover the T phase. Likewise, when the input R phase is disconnection and disconnection occurs as in the case of the vector diagram 242-b (21), the same phase voltage is induced in the coil P3 by the coil P1 on the input S and the coil P3 is in the input T phase The phase voltage on the input S is induced and the coil P4 having one end connected to the coil P3 generates a potential difference of 220 V with the neutral line and the voltage is induced in the coil P4 by the potential difference, And the input R phase is restored to its original state.

Also, as described above, the failure detector 210 is installed at the neutral point N2 of the load side detector / restorer 230 to detect the occurrence of electrical failure of the disconnection, short circuit, contact failure, and half disconnection, Or to transmit the alarm to the controller 220 to recover the alarm, to remotely shutdown the failure electricity, or to inform the user of the abnormality by radio or wirelessly. Alternatively, it is also possible to interrupt or alarm without using the controller 220 using only the fault detector 210.

In detail, when the break or alarm is generated without the controller 220, a voltage is generated at the neutral point N2 and the earth E provided in the load side detector / . When the voltage generated at this time is detected and operated by the non-contact relay SSR implemented by the failure detector 210, the non-contact relay SSR operates the trip coil using the self- And the alarm generator 250 can be operated and the neutral point N2 provided on the load side detector / restorer 230 can be connected to the earth E to recover the failure electricity in real time . Further, when the failure detector 210 detects the current flowing through the neutral point N2 and the ground E, it is possible to inform the outside that the failure has been restored.

Here, the method in which the failure detector 210 detects the disconnection on the power source side, the contact failure, and the half-disconnection can be classified into the following three methods: (1) the voltage of the earth E and the neutral point N2 generated when the disconnection, 2) Detecting what the current detection value of the single-phase, two-wire type electric wire is, and when R1 + R2 = 0, it is judged as normal and when R1 + R2? 0 is detected, an error occurs in the recovery power distribution system 150 (3) In the single-phase three-wire type power line, it can be determined that an abnormality occurs in the restoration power distribution system 150 when the current generated in the failure recovery is R1 + N2 ≠ 0 or R2 + N2 ≠ 0. Similarly, in the case of the occurrence of a short circuit, 1) it is possible to detect the voltage or current of the earth E and the neutral point N2, 2) the current detection value of the single-phase two- It can be determined that an abnormality has occurred in the recovery power distribution system 150 when R1 + R2? 0 is detected. When it is determined that a failure has occurred, the controller 220 transmits an alarm signal or a breaker 270 or transmits a detection value to the controller 220 to remotely send a breaker shutoff signal to the controller 220. Alternatively, And notify them.

Here, the controller 220 may use a relay equipped with a conventional microcomputer function, a short circuit alarm, or the like, or may use a communication facility provided in an existing facility. However, in the present invention, the controller 220 may include a microcomputer, a microprocessor, a central processing unit (CPU), a microprocessor, and a microprocessor, which are capable of storing controllable programs and controlling the overall operation of the real- , A microcontroller, or the like.

If it is determined that an abnormal voltage is generated at the neutral point N2 due to the disconnection or contact failure of the power line or the short-circuit or short-circuit of the power line or the current flows, the controller 220 immediately activates the breaker 270, Generator 250 is driven. The alarm generator 250 alerts the user of a disconnection or a contact failure, a disconnection or a short circuit. In the present invention, an alarm is generated using a visual alarm and / or audible alarm. If the administrator recognizes the time and / or the audible alarm, the user is promptly taken up to follow-up, thereby preventing various electric accidents that may occur due to poor contact of the power line,

The administrator can release alarms as needed. For example, when the alarm release switch provided in the alarm release input device 260 is operated, the alarm release input device 260 generates an alarm release signal and transmits the alarm release signal to the controller 220. When the controller 220 receives the alarm release signal, the controller 220 stops the operation of the alarm generator 250 and releases the alarm.

In the present invention, when the failure detector 210 detects the occurrence of a disconnection or a contact failure, a disconnection, or a short circuit, a high signal is output if the disconnection, a contact failure, a disconnection, The controller 220 compares the set value with the preset value to determine a failure, and real-time restoration, alarming, or blocking as previously determined, or notifying the manager of wired or wireless, , Electric shocks such as electric shock, interruption of control, device burnout, and fire are prevented in advance.

In addition, as is well known, the present invention can be applied to the failure detector 210 even when the load side detector / restorer 230 is operated by the disconnection, the contact failure, or the half disconnection to recover the disconnection or contact failure, If the electric leakage or short-circuit is detected in spite of the operation of the load side detector / restorer 230 due to the abnormal voltage or current at the power line or the neutral point at this time, (MCCB, ELB, etc.) are automatically operated, alarmed or notified by wired or wireless using a signal to prevent power outage, electric shock, load burnout and fire.

For example, according to the present invention, the power supply side of the power distribution system automatically performs the automatic recovery of the fault power, thereby preventing the occurrence of a power failure caused by disconnection. (Short circuit), electric appliance burnout, overheating, and electric fire are prevented, and electric shock and electric fire caused by electric leakage can be reduced when an electric leakage is generated, thereby preventing accidents caused by electric failure.

In addition, when the failure recovery is failed, the circuit breaker operation control signal is generated to operate the circuit breaker, thereby preventing damage of the rear end device due to an overcurrent, an abnormal voltage, or the like

Fig. 9 is a circuit diagram for detecting a failure electric power such as a broken wire. For example, when a failure occurs in an electrical equipment such as a transformer or a fuse connected to the R phase, the electrical circuit of the S phase and the T phase changes into a single phase, the neutral point N1 changes the potential, and the failure detector 210 detects the changed potential In the case of a single phase, it is possible to detect a fault situation through the neutral point N1, the ground, the neutral line, and the neutral point.

10 is a circuit diagram of a real-time detection / recovery system 200 in the event of a power line failure in a power distribution system according to a preferred embodiment of the present invention. The fault detector 210, which detects a faulty electric power, Or the failure recovery switch may be operated to operate the recoverers 240-a and 230-b, or to transmit an electrical signal to the alarm or controller to perform the tasks such as interception, alarm, notification, A resistor or a capacitor or an inductor may be installed on the power line (R or S or T or R1 or R2) and the neutral line (N) so that the fault can be detected by the fault detector (210) R1 or R2 is induced in the neutral line N during disconnection of the neutral line N so that the neutral line disconnection can be detected.

The real-time detection / recovery system (200) in the event of power line failure of the power distribution system of the present invention can be realized as a single module and commercialized. This can be used to check electrical faults (short-circuit, single-wire, poor contact, or short-circuit) on a single-phase power supply, to alert them by installing them on a distribution board or switchboard, or to cut off power in case of power failure, It can easily be applied to alarm or block abnormal power, or to gain real-time electrical fault recovery.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

120 - first leg, 130 - second leg, 140 - third leg
200 - Real-time repair transforming system (method) in case of single-phase power line failure according to a preferred embodiment of the present invention
210 - Failure detector (SSR, ZCT, CT, voltage, current detector, relay, etc.)
220 - controller
230 - Load detection / recovery
240 - Power side detection / recovery device
250 - Alarm generator
260 - Alarm release input device
270 - Circuit breaker (earth leakage circuit breaker, wiring breaker, MG / SW, electronic switch, etc.)
300 - Main transformer (secondary coil of existing transformer)
R1, R2 - single-phase power line of the recovery power distribution system
R, S, T - Three phase power line,
E or ET - Ground (Ground)
N - neutral line, N1 - first neutral point, N2 - second neutral point
L1 - Load side transformer coil winding
L2 - Load side transformer coil winding
L3 - Power side transformer coil winding
L4 - Power side transformer coil winding
P1 - S phase power supply side disconnection recovery transformer coil winding
P2 - R phase power supply side disconnection recovery transformer coil winding
P3, P4 - T phase power supply side disconnection recovery transformer coil winding

Claims (15)

In a system for prevention of electric power failure, electric shock, and fire accident due to disconnection of power source side of power distribution system, contact failure,
Wherein the power distribution system includes at least one of a power source side detection / recovery unit and a load side detection / recovery unit,
The power source side detector / restorer may be configured to neutralize the neutral point of the power output coil to ground the neutral point or to detect a potential difference between the neutral point and the ground, thereby detecting abnormal voltage input, Failure, restoration, interruption, alarm, notification, and control when the resistance increases,
The load side detection / recovery unit may be configured to configure a neutral point in the middle of the power output coil so that the neutral point is grounded to the ground or connected to the neutral point of the power supply side detection / recovery unit, or a potential difference between the neutral point and the ground is detected, Wherein at least one of abnormal voltage input, image formation, disconnection, connection failure, resistance recovery, interruption, alarm, notification, and control is performed in a power line failure in a power line failure detection system. In a system for prevention of electric power failure, electric shock, and fire accident due to disconnection of power source side of power distribution system, contact failure,
A first leg, a second leg, and a third leg which are connected to a power source and are iron cores; A power source side detection / recovery device composed of a first coil, a second winding, and a third winding which are coils, and a load side detection / recovery device connected to the load side,
The power source side detector / restorer may include a primary coil, a first leg, a second leg, and a third leg which are iron cores; And a first winding, a second winding, and a third winding, which are secondary coils. Wherein the first winding is wound on the first leg, the second winding is wound on the second leg, the third winding is wound on the third leg, and the first winding, the second winding, The three-phase power source supplied to the load at the secondary coil is supplied at a value three times the root of the ground potential difference, the single-phase power source is supplied at half the ground potential difference, and the load side detection / And a coil for recovering the power from the recovery unit. The power supply side detection / recovery device according to claim 1 or 2,
Even if R phase or S phase or T phase or neutral line (N) is disconnected or frayed from the power source side due to lightning, short circuit, short circuit, ground fault, fuse breakage in the power distribution system, the power failure is recovered, And the ground potential difference of the single-phase power source is lowered to prevent electric shock and fire caused by a short circuit (ground fault). A real-time detection / recovery system in case of power line failure in a power distribution system. The load detection / recovery device according to claim 1 or 2,
The neutral point of the load side detector / restorer is grounded to the ground and composed of a single-phase power supply line, which prevents the short-circuit accident by the line, reduces the leakage current, reduces the line fault, Real - time detection / recovery system in case of power line failure in power distribution system. The load detection / recovery device according to claim 1 or 2,
If an electrical failure occurs due to a disconnection or a contact failure, a disconnection or a short circuit (ground fault) at the power source side of the load side detector / breaker, the neutral point of the load side detector / And transmits the generated power to the fault detector. The power supply side and load side detection / recovery device according to claim 1 or 2,
Phase or three-phase power source, and the neutral point is grounded to the ground, or the potential difference between the neutral point and the ground is detected, or a current flowing through the neutral point and the ground is detected, Wherein the power supply line of the three-phase power supply performs at least one of abnormal voltage input, phase loss, disconnection, connection failure, recovery, blocking, alarm, Recovery system. The electronic device according to claim 6,
A resistor or capacitor or varistor or silicon or germanium or carbon or a coil or an integrated circuit or a relay or a contactless relay SSR ) Or a trip coil. 2. The real-time detection / recovery system according to claim 1, 6. The apparatus of claim 5,
It detects electric signals that occur when a power line or a neutral point on a power line or a neutral point of a power source side or a load side detection / recovery line is broken and detects an abnormal voltage input, disconnection, phase loss, resistance increase, contact failure, half break, And when the failure is detected by one or more faults, the fault is detected through an alarm generator, blocked through a circuit breaker, controlled through a controller, or recovered in real time through the power source side or the load side detection / Detection / recovery system. 6. The apparatus of claim 5,
(SSR), a video current transformer, a voltage detector, a current detector, a relay, or a trip coil is used for detecting a fault generating electrical signal output from the neutral point or the power line. system. The power supply side detection / recovery device according to claim 1 or 2,
The neutral point of the output voltage of the power supply side detector / restorer is grounded to the ground, and the potential difference between the power supply line and the ground is lowered, and the potential difference is maintained at a constant potential. Thus, disconnection, unbalance, A real time detection / recovery system in case of power line failure in power distribution system, characterized by preventing a fire accident. The power supply side detection / recovery device according to claim 1 or 2,
It is connected to three-phase four-wire or single-phase three-wire distribution system to block the source of image harmonics introduced into the neutral line by the nonlinear single-phase load in the distribution system and prevents unbalance overvoltage inflow when the neutral line is broken. Wherein the power supply line is connected to the power supply line. The power supply side detection / recovery device according to claim 1 or 2,
It is connected to the three-phase four-wire power distribution system to recover real-time three-phase power even when one of the fuse breaks, line breakage, transformer failures, equipment failures, and neutral breaks are disconnected from the power source. Wherein a power failure of the single-phase power supply is prevented at the source. In a system for prevention of power outage, electric shock and fire accident caused by disconnection of power source side, contact failure, semi-disconnection, short-circuit of single-phase or three-phase power distribution system,
A power supply side detection / recovery unit having a first neutral point and grounding the neutral point to the ground to reduce the potential difference with the earth from the existing potential difference;
A load side detection / recovery unit having a second neutral point and grounding the neutral point to the ground or connecting the neutral point of the power source side detection /
The input / output current of the power line or the neutral point of the load side detector /
A fault detector for detecting the neutral point and the ground voltage and for alerting or shutting off or transmitting the detected fault detection value to the controller;
A controller for comparing the detection value provided by the fault detector with a preset value and delivering the alarm to the communication module so as to issue an alarm, turn off the power supply, notify the wired or wireless communication line when the alarm is detected,
An alarm generator for generating an alarm according to the alarm signal provided by the fault detector or the controller;
An alarm release input unit for canceling an alarm notification of the alarm generator;
And a breaker for shutting down the faulty power supply according to the fault signal from the fault detector or the controller. In a construction method for prevention of power outage, electric shock and fire accident caused by phase loss, disconnection, increase of resistance, contact failure, half break, short-circuit of single-phase or three-phase power distribution system,
a. Installing at least one of a power side detection / recovery device and a load side detection / recovery device in a single-phase or three-phase power distribution system;
b. The neutral point of the power source side detection / recovery device is grounded or connected to the neutral point of the load side detection / recovery device, and the neutral point of the load side detection / recovery device is grounded to the ground or connected to the neutral point of the power source side detection / ;
c. Connecting the winding of the output coil of the power source side detector / breaker to the load or electrically connecting the winding of the output coil of the power source side detector / breaker to the winding of the input coil of the load side detector / breaker;
d. The power supply side detection / recovery unit and / or the power supply side detection / recovery unit and the load side detection / recovery unit are electrically connected to each other through a single phase or three phase power supply line of the power distribution system. Performing at least one of recovery, shutdown, alarm, notification, and control in the case of abnormal voltage input, image formation, disconnection, connection failure, or increase in resistance in a power supply system of a three-phase power supply. Construction method of real - time detection / recovery system in case of line failure. In a construction method for prevention of power outage, electric shock and fire accident caused by phase loss, disconnection, poor contact, half-breaking, short-circuiting of single-phase or three-phase power distribution system,
a. Installing at least one of a power side detection / recovery device and a load side detection / recovery device in a single-phase or three-phase power distribution system;
b. Installing a fault detector to detect at least one neutral point of the power source side detector / breaker and the load side detector / breaker and a current flowing in the ground and a potential or neutral point of the ground;
c. Connecting the winding of the output coil of the power source side detector / breaker to the load or electrically connecting the winding of the output coil of the power source side detector / breaker to the winding of the input coil of the load side detector / breaker;
e. The power supply side detection / recovery unit and / or the power supply side detection / recovery unit and the load side detection / recovery unit are electrically connected to each other through a single phase or three phase power supply line of the power distribution system. The method comprising the step of performing at least one of abnormal voltage input, image formation, disconnection, connection failure, recovery, interruption, alarm, notification, and control in the power supply system of the three-phase power supply when the resistance increases, Construction method of real - time detection / recovery system in case of failure.

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