KR100993464B1 - The automatic controller of a pannel loading in a row - Google Patents

Abstract

PURPOSE: An automatic load distribution controller for a parallel operation of a distribution panel is provided to prevent a distribution facility from being damaged by improving phase unbalance of a load. CONSTITUTION: A terminal block supplies a power line from a low voltage unit of a transformer to a load distributor through a current transformer. The load distributor selects an output power line by driving a magnetic switch according to the control command of a main controller. The output power line of the load distributor supplies power to a load through a circuit breaker. A main controller is comprised of a microprocessor and controls the power supply to the load to minimize the phase unbalance of the load.

Description

Switchboard parallel operation Load distribution automatic controller {The automatic controller of a pannel loading in a row}

The present invention relates to a water substation facility for supplying power by building unit or plant unit by lowering the special high voltage of 6,600V or more and 22,900V class to low pressure of 380V or 220V.

The present invention relates to a closed switchgear, which is divided into a high-voltage board and a low-pressure board according to a system order in a grounded cubicle (excluding metal), a breakdown section automatic switch (LBS), an arrester, a high-pressure fuse, and a transformer for instrumentation. (MOF), transformer (TR), transformer for instrument (PT), transformer for instrument (CT), and storage battery are installed, and the circuit breaker (MCCB), various measuring devices, and digital control device are built in the low pressure plate. Each unit is built into a unit cubicle to perform its own unique function in an independent space.

The present invention is to solve the problems caused by load imbalance for each phase (R, S, T) that occurs depending on the use of the load (electric device) when supplying power to the load (electric device) through the switchboard. It is to improve the efficiency by supplementing the unbalance of the loaded load with the switchboard parallel operation load distribution automatic controller, and when the parallel operation (operating two or more transformers), the number of turns and polarity of the transformer must match. , Short-circuit, unbalanced loss, etc. occur to solve this problem.

Also, in a switchgear of two-circuit faucet (optionally supplied from different substations), two transformers are installed for subway construction and major facilities, and one of the two transformers receives an actual faucet. Only transformers have been used. According to the present invention, when the capacity of the transformer is insufficient during the peak demand season, two transformers are temporarily operated in parallel to minimize the no-load loss of the transformer according to the efficient operation of the transformer.

In the three-phase four-wire power supply method, when 220V is supplied to the load through R phase-N phase, S phase-N phase, and T phase-N phase, the load amount varies depending on the phase depending on the use of power by load. In this case, the power factor is lowered, and a partial overload condition is caused in each phase winding of the power supply transformer, thereby causing a problem such that the power supply transformer is burned out.

Therefore, if the load unbalance rate is measured and unbalanced above the set value, it is possible to prevent the power factor drop and burnout of the power supply transformer by performing maintenance work for correcting. The load unbalance rate should be determined, and after installation of the facility, if the manager does not check the load unbalance rate from time to time, the load unbalance may not be detected, resulting in a power factor drop and damage to the power supply transformer.

In addition, in order to efficiently operate the transformer and reduce the no-load loss, in parallel operation by installing a plurality of transformers, the conditions and characteristics of the parallel operation must be identical. Otherwise, the transformer may be burned out or the risk of explosion accident occurs.

In the case of railroad construction, subway construction, and major facilities, only one transformer is installed in a two-circuit power receiving system that selectively receives power from different substations, but two transformers have been installed and used as one transformer.

When the capacity of the transformer is increased for the peak demand season, such as summer, there is a problem that the no-load loss of the transformer is large when the demand period is relatively low.

When multiple transformers are installed and parallel operation (TIE operation), the characteristics of the transformer must be the same, such as the turns ratio and frequency of the transformer. In general, it is common to select a transformer of the same model of the same manufacturer. .

If the characteristics are different, there are many risk factors such as burnout and heat generation of the transformer, and in spite of the many advantages of parallel operation, field maintenance workers are reluctant to parallel operation.

In addition, the actual demand for load varies according to seasons and seasons. (The final terminal outlet load is not uniform for each phase. For example, each phase (A, B-R-R) is considered in consideration of the phase balance for the power supply of 6 computers in the office. Phase, C, D-S phase, E, F-T phase), but when Mr. A leaves the office, R phase decreases the load and the remaining phase becomes relatively unbalanced. Overall, such extremes do not occur, but eventually, the imbalance is greatly affected by seasons and time zones, and the imbalance is inevitable.

In addition, minimizing no-load losses by simply changing the capacity of the transformer. In particular, only one of two transformers installed in a switchgear receiving two-circuit faucets is removed from the conventional method of receiving power in one substation, so that two transformers can be used simultaneously.

The present invention relates to a switchboard applied to major facilities, such as subway construction, railway construction receiving two faucets by installing two transformers.

The present invention solves the above problems by sharing the load without affecting mutual interference even if the characteristics of the plurality of transformers are different in order to solve the above problems.

In addition, in order to reduce the no-load operation loss of the transformer, a plurality of three-phase transformers are installed in parallel, so that the load-free operation of the transformer can be eliminated and the capacity can be simply expanded.

It also minimizes phase imbalance by selecting and controlling the load for each phase.

1. The present invention is fundamentally different from the technique of simply solving the parallel operation or the technique of measuring the phase imbalance and eliminating the phase imbalance with respect to the prior art. It is the first invention that a simple addition and parallel operation of a transformer having different characteristics is possible.

2. Parallel operation of the transformer is possible even if the characteristics of the transformer do not match.

3. It eliminates the risk of loss and accident caused by transformer characteristics, frequency unbalance, etc. in parallel operation.

4. Even if the transformer characteristics are different, it is possible to simply increase the transformer capacity.

5. Improvement of phase imbalance of load prevents power factor improvement and burnout of power distribution equipment.

In particular, the phase imbalance can be immediately and simply improved in consideration of the reality that the load demand for each phase is varied according to seasons and time zones differently from the prior art.

6. In a two-circuit power distribution panel, two conventionally installed transformers are temporarily used during the peak demand season to reduce no-load loss.

1 is a schematic diagram of an embodiment for understanding a load divider to minimize phase imbalance through light load control in a distribution panel
2 is a simplified diagram of operating two three-phase transformer according to the present invention
Figure 3 is a schematic diagram of minimizing phase imbalance through the load distributor in the switchboard low voltage panel twice
4 is a schematic diagram of minimizing phase imbalance through a load divider in a switchgear low voltage panel and a load divider in a distribution panel.
5 is a schematic view of a load divider using a magnetic switch
6 is a schematic diagram of a load divider for selecting a transformer and phase through a relay
7 is a schematic diagram of an embodiment for understanding a load divider in a distribution panel
FIG. 8 is a schematic diagram illustrating an embodiment for understanding a load divider in a distribution panel that minimizes phase imbalance by controlling only a light load. FIG.
9 is a simplified diagram for understanding the present invention receiving two-time faucets
10 is a schematic diagram of the present invention.

The high voltage (6,600V or more and 22,900V) drawn from the Korea Electric Power Corporation through the high voltage inlet is introduced into the transformer (TR) through the automatic failure switch (LBS), lightning arrester, high voltage fuse, and instrument transformer (MOF) in the high voltage board. When converted into low voltage and introduced into the low voltage plate, the common power supply of AC 220V, single phase 380V, three phase 380V is supplied to the load through an earth leakage breaker, wiring breaker, current transformer, terminal block, etc. in the low platen cubicle. DC 110V is supplied to the low platen through the storage battery in the ground, and the low platen is driven by DC 110V driving power to drive various automatic control devices and measuring devices, and separately installs an uninterruptible power supply (UPS) to cope with power failure. It has a normal switchboard configuration.

The main control unit of the switchboard parallel operation load distribution controller is a server-class microprocessor based on the Windows XP operating system.

A microprocessor is a TTL or CMOS IC that operates only on certain characteristics, whereas a microprocessor allows an administrator to inject a program into the processor to achieve the desired operating characteristics. The microcontroller for the entire control program and operation is also called the motherboard (MOTHERBOARD) or the motherboard (MAINBOARD).

In the known prior art, a method of measuring the phase unbalance by measuring the amount of current flowing through the neutral line (N phase) is used, but the present invention does not measure the amount of current in the neutral line (N phase).

That is, measuring the degree of phase imbalance is not important in the present invention, because it is a technology that puts the most important 'combination of loads' and efficient parallel operation to minimize the phase imbalance.

In one embodiment, a transformer added for parallel operation to a transformer having a frequency characteristic of 60 Hz has to have a frequency characteristic of 60 Hz, but according to the present invention, since the two transformers do not influence each other, a transformer having a frequency characteristic of 65 Hz is added. Okay.

As an example, a total of 9kW was used as a light load (1kW), cooling load (2kW), fire load (1kW), and heat transfer load (5kW) through a transformer with a frequency characteristic of 60 Hz and a capacity of 10kW. And when the total heat load demand is increased to 18kW as a light load (1kW), cooling load (8kW), fire load (1kW), heat transfer load (8kW), the frequency characteristics that are additionally input in the present invention is 65Hz, A transformer with a capacity of 10 kW accommodates a light load (1 kW) and a cooling load (8 kW), while a transformer with a conventional frequency characteristic of 60 Hz and a capacity of 10 kW accommodates a fire load (1 kW) and a heat transfer load (8 kW) separately. In this case, the two transformers may have different characteristics.

That is, the greatest core of the present invention is characterized in that a plurality of transformers are operated independently for each load, and that phase imbalance is minimized for each transformer by operating loads independently for each phase.

In addition, according to the present invention, when receiving two-circuit parallel faucet, two transformers may be used by expanding the transformer capacity for parallel operation during peak season as well as two-circuit receiving.

It will be described in detail with reference to the drawings.

1 is a schematic diagram of an embodiment for understanding a load distributor that minimizes phase imbalance through light load control in a distribution panel.

2 is a simplified diagram of operating two three-phase transformers in accordance with the present invention.

As shown in FIG. 2, a load divider receives a power line for each phase through two three-phase transformers. That is, a load divider consisting of six magnetic switches is used to select and output three output power lines among six power lines.

The transformer is selected for the fixed load through the load divider to supply power to the fixed load. That is, three-phase power of R, S, and T output from one transformer is selectively output.

For example, when the output power of transformer 1 is designated as R1, S1, T1 for each phase and the output power of transformer 2 is designated as R2, S2, T2 for each phase, when the load divider supplies power to the fixed load, R1, Only one group of S1, T1 or R2, S2, T2 outputs selectively.

However, the load divider wired to the variable load selects an output that minimizes phase imbalance and selects and outputs one of R1 and R2, and also selects one of S1 and S2 and selects and outputs one of T1 and T2 as a whole. Minimize phase imbalance.

Minimizing phase imbalance will be described in detail with reference to the following table.

As shown in Table 1, 37A current is supplied to the load through the R1-5 circuit breaker (MCCB), and 35A is loaded through the S1-5 wiring breaker (MCCB). If the current of 27A is supplied to the load through the circuit breaker (MCCB) of T1 to 5 and wired to T phase, R5 and T3, S2 and T2 circuit breaker (MCCB) The replacement will resolve the phase imbalance as shown in Table 2.

Award category MCCB No Load Phase load Load inequality

R

R1 7A

37A



+ 12%

R2 8A R3 5A R4 8A R5 9A

S

S1 5A

35A



+ 6%

S2 8A S3 6A S4 8A S5 8A

T

T1 5A

27A



-18%

T2 6A T3 5A T4 5A T5 6A

Award category MCCB No Load Phase load Load inequality

R

R1 7A

33A


0%

R2 8A R3 5A R4 8A T3 5A

S

S1 5A

33A



0%

T2 6A S3 6A S4 8A S5 8A

T

T1 5A

33A



0%

S2 8A R5 9A T4 5A T5 6A

As mentioned above, the main control part that minimizes load inequality is divided into three phase groups in which phase imbalance is minimized by receiving current-carrying current information through a current transformer, thereby driving a magnetic switch in a load breaker to configure a wiring circuit between loads for each three phases. A main control unit comprising: a main control unit comprising a main control unit comprising a microprocessor configured to calculate a total load by receiving current amount information of one or more current transformers; Calculating phase loads for each phase by substituting the current amount information received in the first step for each of R phases, S phases, and T phases; Compare the average load divided by the total load by 3 and the phase load, and if the manager input value (in one embodiment, the load unbalance rate is 1%) or more, substitute the amount of current information into each phase in step 2, and if the manager input value is less than And a step 3 of connecting the ON-contact connection of the magnetic switch in the load divider so as to wire the circuit breaker corresponding to the current amount of information inserted into the corresponding phase.

That is, loads are assigned to each phase until the load unbalance rate is less than 1%.

FIG. 3 is a schematic diagram of minimizing phase imbalance through the load divider in the switchboard low voltage plate twice. FIG. 3 is an exemplary embodiment in which phase imbalance can be finely controlled than in the embodiment of FIG. 2.

FIG. 4 is a schematic diagram of minimizing phase imbalance through a load divider in a switchgear low voltage board and a load divider in a switchgear. FIG. 4 shows a phase power line output from a transformer installed in a high voltage board 1 in a switchgear. It is input to the divider and is supplied to the distribution panel 3 on the fixed and variable load side by the selective output of the load divider.

The load divider in the distribution panel (3) selects and outputs power lines between phases and loads to minimize load imbalance.

Minimizing load inequality is the same principle as described in Tables 1 and 2 above, and minimizing load inequality is controlled by a main controller composed of microprocessors.

FIG. 5 is a simplified diagram of a load divider using a magnetic switch to receive selective inputs through two transformers for each of R, S, and T phases.

6 is a simplified diagram of a load divider for selecting a transformer and phase through a relay.

7 is a schematic diagram of an embodiment for understanding a load distributor in a distribution panel.

8 is a schematic diagram of an embodiment for understanding a load distributor in a distribution panel.

9 is a simplified diagram for the understanding of the present invention receiving two-circuit faucet, when receiving two-circuit faucets through two substations, the circuit changer selectively receives only one of two ON substations, and the transformer switcher receives a high power transformer. When using two transformers at the same time is a simplified diagram for understanding the present invention that can be operated flexibly while minimizing no-load loss without expanding the capacity of the transformer.

10 is a schematic diagram of the present invention.

Hereinafter will be described in detail with reference to the drawings.

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It is an automatic distribution controller for parallel operation of the distribution panel installed in the low voltage panel, consisting of transformer, terminal block, current transformer, load divider, wiring breaker, and main control part.

The terminal block is a terminal block that receives the power line from the transformer low voltage part and fixes and branches it to supply the power line to the load distributor through the current transformer.

The current transformer measures the amount of current in each phase of the power line branched through the terminal block, and transmits the amount of energized current measured by the main control part through the control line.

The load divider is a load divider that selects and outputs an output power line among input power lines by driving a magnetic switch ON / OFF according to a control command of a main controller inputted through a control line.

As an example, only one of the two input power lines of the R phase of the A transformer and the R phase of the B transformer is output.

The output power line of the load divider supplies power to the load through the circuit breaker.

The main controller, which consists of microprocessors, receives the amount of energized current for each phase of the transformer and features a main controller for selecting and controlling a phase for supplying the load through a load divider wired to the load to minimize phase imbalance.

As an example, as shown in Table 1 above, a current of 37 A is supplied to the load through the R1-5 wiring breaker (MCCB), and the S phase is wired through the S1-5 wiring breaker (MCCB). When a current of 35 A is supplied to the load, is wired on T, and a current of 27 A is supplied to the load through the T1 to 5 circuit breakers (MCCB), as shown in Table 2, R5 and T3, S2 and T2 circuit breakers (MCCB). ), If the input power phases are replaced with each other, the phase imbalance is resolved as shown in Table 2.

The main control part is divided into three phase groups that receive the current-carrying current information through the current transformer into three phase groups to minimize phase imbalance. It is a switchboard parallel operation load distribution automatic controller.

In one embodiment, the main control unit for minimizing the load inequality is divided into three phase groups in which the phase imbalance is minimized by receiving the current carrying current information of each phase through the current transformer to drive the magnetic switch in the load breaker to establish the wiring circuit between the loads for each of the three phases. The main control unit is a step of calculating the total load by receiving the current amount information of one or more current transformers to the switchboard parallel operation load distribution automatic controller characterized by the main control unit composed of a microprocessor to configure; Calculating phase loads for each phase by substituting the current amount information received in the first step for each of R phases, S phases, and T phases; Compare the average load divided by the total load by 3 and the phase load, and if the manager input value (in one embodiment, the load unbalance rate is 1%) or more, substitute the amount of current information into each phase in step 2, and if the manager input value is less than And a step 3 of connecting the ON-contact connection of the magnetic switch in the load divider so as to wire the circuit breaker corresponding to the current amount of information inserted into the corresponding phase.

That is, loads are assigned to each phase until the load unbalance rate is less than 1%.

In one embodiment,

In a switchgear receiving two parallel circuits, it is composed of a transformer, a terminal block, a current transformer, a load divider, a wiring breaker, and a main control part.

The terminal block is a terminal block that receives the power line from the transformer low voltage part and fixes and branches it to supply the power line to the load distributor through the current transformer.

The current transformer measures the amount of current per transformer and phase of the power line branched through the terminal block, and transmits the measured amount of current through the control line to the main control part.

The load divider is a load divider that selects and outputs an output power line among input power lines by driving a magnetic switch according to a control command of a main controller inputted through a control line.

The output power line of the load divider supplies power to the load through the circuit breaker.

The main controller composed of microprocessors receives main electric current by each phase of the transformer and controls main electric power to select a phase to supply power to the load through a load divider wired to the load to minimize phase imbalance. Switchboard parallel operation load distribution automatic controller characterized by main controller consisting of microprocessors that organize the wiring circuit between loads by driving magnetic switch in load switch by dividing into three phase group which minimizes phase imbalance by receiving information. to be.

In one embodiment,

In a switchgear receiving two circuits in parallel, it consists of a transformer, a circuit switch, a transformer switch, a terminal block, a current transformer, a load divider, a wiring breaker, and a main control part.

The circuit changer is installed on the input circuit for each substation so that only one of the two circuit changers maintains the ON contact.

In an embodiment, in FIG. 1, two substations are installed on input circuits inputted by substations A and B, and only one ON contact is maintained and the remaining OFF contact is received in one substation.

The terminal block is a terminal block that receives the power line from the transformer low voltage part and fixes and branches it to supply the power line to the load distributor through the current transformer.

The current transformer measures the amount of current per transformer and phase of the power line branched through the terminal block, and transmits the measured amount of current through the control line to the main control part.

The load divider is a load divider that selects and outputs an output power line among input power lines by driving a magnetic switch according to a control command of a main controller inputted through a control line.

The output power line of the load divider supplies power to the load through the circuit breaker.

The main control part composed of microprocessor receives the energizing current of the transformer receiving the current through the current transformer and uses only one transformer by maintaining the transformer contactor when the transformer utilization is less than the administrator input value programmed into the microprocessor.

However, if the transformer utilization increases above the manager input (for example, a value equal to 90%, such as when the transformer is used above 90%, is a numerical value programmed into the microprocessor), the transformer switch maintains the ON contact. do.

That is, power is supplied to both transformers.

The main control section selects and controls the transformer and phase to be supplied to the load through a load divider wired to the load to minimize phase imbalance.

The main control unit receives the current information of each transformer and phase through the current transformer and divides it into three phase groups that minimize phase imbalance of each transformer to drive the magnetic switch in the load breaker to form a wiring circuit between loads for each three phases of the transformer. It is a switchboard parallel operation load distribution automatic controller featuring a main controller composed of microprocessors.

In one embodiment,

In a closed switchgear receiving two circuits in parallel, consisting of an enclosure cubicle, a high voltage board, and a low voltage board, the switchboard parallel operation load distribution automatic controller installed in the low voltage board is composed of a terminal block, a current transformer, a load divider, a wiring breaker, and a main control part.

The enclosure cubicle is an enclosure cubicle including upper and lower partitions that separate the top and the bottom, and a power line is connected to the busbar in the top cubicle to form a converter.

The terminal block is a terminal block that receives the power line from the transformer low voltage part and fixes and branches it to supply the power line to the load distributor through the current transformer.

The current transformer measures the amount of current per transformer and phase of the power line branched through the terminal block, and transmits the measured amount of current through the control line to the main control part.

The load divider is a load divider that selects and outputs an output power line among input power lines by driving a magnetic switch according to a control command of a main controller inputted through a control line.

The output power line of the load divider supplies power to the load through the circuit breaker.

The main controller composed of microprocessors receives main electric current by each phase of the transformer and controls main electric power to select a phase to supply power to the load through a load divider wired to the load to minimize phase imbalance. Switchboard parallel operation load distribution automatic controller characterized by main controller consisting of microprocessors that organize the wiring circuit between loads by driving magnetic switch in load switch by dividing into three phase group which minimizes phase imbalance by receiving information. to be.

In one embodiment,

In a switchboard receiving two parallel circuits,

It consists of transformer, circuit changer, transformer changer, terminal block, current transformer, wiring breaker and main control part.

The circuit changer is installed on the input circuit for each substation so that only one of the two circuit changers maintains the ON contact.

The terminal block is a terminal block that receives the power line from the transformer low voltage part, fixes and branches it, and supplies the power line to the circuit breaker through the current transformer.

The current transformer measures the amount of current for each transformer in the power line branched through the terminal block and transmits the amount of energized current measured to the main control part through the control line.

The main control part composed of microprocessor receives the energizing current of the transformer receiving the current through the current transformer and maintains the transformer contactor OFF contact when the transformer utilization is less than the administrator input value programmed in the microprocessor. Increasingly, the switchboard parallel operation is maintained by maintaining the ON contact, and the main control unit consisting of a microprocessor that converts the contact point of the circuit changer to the opposite contact received from another substation when the receiving substation is out of power. Operation load distribution automatic controller.

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1: High pressure board in switchboard
2: Low voltage plate in switchboard
3: distribution board

Claims (7)

delete In a switchboard receiving two parallel circuits,
Consists of transformer, terminal block, current transformer, load divider, wiring breaker, main control part,
The terminal block is a terminal block for receiving the power line from the transformer low voltage unit, and fixing and branching the power line to supply the power line to the load distributor through the current transformer;
The current transformer measures the amount of current per transformer and phase of the power line branched through the terminal block, and transmits the amount of energized current measured to the main control part through the control line;
The load divider is a load divider which drives the magnetic switch according to the control command of the main controller input through the control line to select and output the output power line among the input power lines;
The output power line of the load divider supplies power to the load via a circuit breaker;
The main controller composed of microprocessors receives main electric current by each phase of the transformer and controls main electric power to select a phase to supply power to the load through a load divider wired to the load to minimize phase imbalance. Switchboard parallel operation load distribution automatic controller characterized by main controller consisting of microprocessors that organize the wiring circuit between loads by driving magnetic switch in load switch by dividing into three phase group which minimizes phase imbalance by receiving information. .
In a switchboard receiving two parallel circuits,
Consists of transformer, circuit switch, transformer switch, terminal block, current transformer, load divider, wiring breaker, main control part,
A circuit changer is installed on an input circuit for each substation so that only one of the two circuit changers maintains an ON contact;
The terminal block is a terminal block for receiving the power line from the transformer low voltage unit, and fixing and branching the power line to supply the power line to the load distributor through the current transformer;
The current transformer measures the amount of current per transformer and phase of the power line branched through the terminal block, and transmits the amount of energized current measured to the main control part through the control line;
The load divider is a load divider which drives the magnetic switch according to the control command of the main controller input through the control line to select and output the output power line among the input power lines;
The output power line of the load divider supplies power to the load via a circuit breaker;
The main control part composed of microprocessor receives the energizing current of the transformer receiving the current through the current transformer and maintains the transformer contactor OFF contact when the transformer utilization is less than the administrator input value programmed in the microprocessor. Increasingly, the transformer switch maintains the ON contact point and features a main controller for selecting and controlling the transformer and phase to be supplied to the load through a load divider wired to the load to minimize phase imbalance. Distribution board characterized by a main controller consisting of microprocessors that form the wiring circuit between loads by three phases of each transformer by driving the magnetic switch in the load breaker by dividing it into three phase groups that minimize the phase imbalance of each transformer by receiving the current amount of current. Parallel operation load divider Controller.
In a closed switchgear which receives two circuits in parallel, consisting of an enclosure cubicle, a high voltage plate and a low voltage plate,
The switchboard parallel operation load distribution controller installed in the low voltage panel. It consists of terminal block, current transformer, load divider, wiring breaker and main control part.
The enclosure cubicle is an enclosure cubicle including upper and lower partitions that separate the top and the bottom, and a power line is fastened to a busbar in the top cubicle to form a converter;
The terminal block is a terminal block for receiving the power line from the transformer low voltage unit, and fixing and branching the power line to supply the power line to the load distributor through the current transformer;
The current transformer measures the amount of current per transformer and phase of the power line branched through the terminal block, and transmits the amount of energized current measured to the main control part through the control line;
The load divider is a load divider which drives the magnetic switch according to the control command of the main controller input through the control line to select and output the output power line among the input power lines;
The output power line of the load divider supplies power to the load via a circuit breaker;
The main controller composed of microprocessors receives main electric current by each phase of the transformer and controls main electric power to select a phase to supply power to the load through a load divider wired to the load to minimize phase imbalance. Switchboard parallel operation load distribution automatic controller characterized by main controller consisting of microprocessors that organize the wiring circuit between loads by driving magnetic switch in load switch by dividing into three phase group which minimizes phase imbalance by receiving information. .
In a switchboard receiving two parallel circuits,
Consists of transformer, circuit changer, transformer changer, terminal block, current transformer, wiring breaker, main control part,
A circuit changer is installed on an input circuit for each substation so that only one of the two circuit changers maintains an ON contact;
The terminal block is a terminal block for receiving the power line from the transformer low voltage unit, and fixing and branching the power line to supply the power line to the circuit breaker through the current transformer;
The current transformer measures the amount of current per transformer by the power line branched through the terminal block and transmits the amount of energized current measured by the main control unit through the control line;
The main control part composed of microprocessor receives the energizing current of the transformer receiving the current through the current transformer and maintains the transformer contactor OFF contact when the transformer utilization is less than the administrator input value programmed in the microprocessor. Increasingly, the switchboard parallel operation is maintained by maintaining the ON contact, and the main control unit consisting of a microprocessor that converts the contact point of the circuit changer to the opposite contact received from another substation when the receiving substation is out of power. Operation load distribution automatic controller.
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