CN112154340A - Characteristic test system for protective relay device - Google Patents
Characteristic test system for protective relay device Download PDFInfo
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- CN112154340A CN112154340A CN201880093647.XA CN201880093647A CN112154340A CN 112154340 A CN112154340 A CN 112154340A CN 201880093647 A CN201880093647 A CN 201880093647A CN 112154340 A CN112154340 A CN 112154340A
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- 238000012360 testing method Methods 0.000 title claims abstract description 131
- 230000001681 protective effect Effects 0.000 title claims abstract description 83
- 238000012545 processing Methods 0.000 claims abstract description 39
- 238000006243 chemical reaction Methods 0.000 claims description 50
- 238000005259 measurement Methods 0.000 claims description 34
- 238000010586 diagram Methods 0.000 description 12
- 230000006870 function Effects 0.000 description 8
- 238000009413 insulation Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000012790 confirmation Methods 0.000 description 7
- 238000002955 isolation Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000003321 amplification Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000012937 correction Methods 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 230000005856 abnormality Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/333—Testing of the switching capacity of high-voltage circuit-breakers ; Testing of breaking capacity or related variables, e.g. post arc current or transient recovery voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
- G01R31/3274—Details related to measuring, e.g. sensing, displaying or computing; Measuring of variables related to the contact pieces, e.g. wear, position or resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Emergency Protection Circuit Devices (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention provides a characteristic test system of a protective relay device, which can confirm the soundness of a test signal generated by a test waveform generating circuit arranged in the protective relay device. The device is provided with a voltage measuring device (15), wherein the voltage measuring device (15) measures a test signal from a test waveform generating circuit (7), and the test waveform generating circuit (7) generates the test signal input to a measuring circuit (6) according to a processing signal from an arithmetic processing unit (2) of the protective relay device (1).
Description
Technical Field
The present invention relates to a characteristic test system for a protective relay device that performs a characteristic test of a protective relay device that protects an electrical facility from an abnormal influence of an electric power system.
Background
A protective relay device is a device for detecting an abnormality such as an accident or a failure in an electric power system and separating an electric apparatus connected to the electric power system from the electric power system to protect the electric apparatus.
In order to maintain a proper protection function of the protective relay device, it is necessary to periodically perform a characteristic test on the protective relay device.
In such a characteristic test of the protective relay device, an input of a predetermined value (also referred to as a set value) or more as a reference for operating the protective function of the protective relay device is provided to the protective relay device to detect an abnormality, and when the time during which the abnormality is detected continues for a predetermined period, it is confirmed that the protection is operating. There is known a method of performing a characteristic test by applying a test input from a dedicated tester capable of generating a test signal suitable for the characteristic test, which is connected to an external device connection terminal section of a protective relay device, or a characteristic test system capable of performing the characteristic test using a test signal generated by a test waveform generation circuit provided inside the protective relay device (for example, see patent document 1).
Documents of the prior art
Patent document
Patent document 1: japanese patent application laid-open No. 2010-284057
Disclosure of Invention
Technical problem to be solved by the invention
In the above-described characteristic test of the protective relay device, when the characteristic test is performed using the tester, it is necessary to connect the tester prepared separately from the protective relay device to the protective relay device every time the characteristic test is performed. Further, when a characteristic test is performed by using a test waveform generation circuit built in the protection relay device, since the system cannot confirm the soundness of a test signal generated by the test waveform generation circuit corresponding to a test signal simulating the output of the tester, it cannot be determined whether or not the protection is operating under a predetermined condition based on the test signal input from the test waveform generation circuit.
The present application discloses a technique for solving the above-described problems, and an object thereof is to provide a characteristic test system for a protective relay device that does not require a tester to be prepared externally separately from the protective relay device, and that is capable of confirming the soundness of a test signal generated by a test waveform generation circuit provided inside the protective relay device when a characteristic test is performed using the test waveform generation circuit.
Means for solving the problems
In a system for testing characteristics of a protective relay device disclosed in the present application, the protective relay device includes: an input circuit to which an analog electric quantity from an electric power system is input; a measurement circuit having an A/D converter that converts an analog electrical quantity from the input circuit into a digital signal; an arithmetic processing unit that executes arithmetic processing using the digital signal from the measurement circuit; an output circuit that generates a signal for operating the circuit breaker based on the determination result of the arithmetic processing unit; a display unit that sets display items based on an input from the operation switch unit and displays an output from the arithmetic processing unit based on the set display items; and a test waveform generating circuit provided in the protective relay device and generating a test signal to be input to the measuring circuit based on the processing signal from the arithmetic processing unit, wherein the characteristic test system of the protective relay device includes a measuring device that measures the test signal generated by the test waveform generating circuit.
Effects of the invention
According to the characteristic test system of the protective relay disclosed in the present application, by including the measuring device for measuring the test signal generated by the test waveform generation circuit, the soundness of the test signal generated by the test waveform generation circuit can be confirmed.
Drawings
Fig. 1 is a block diagram showing a configuration of a characteristic test system of a protective relay device according to embodiment 1.
Fig. 2 is an external view showing a schematic configuration of the front surface of the protective relay in the characteristic test system for the protective relay according to embodiment 1.
Fig. 3 is an external view showing a schematic configuration of a front surface of a signal conversion unit in the characteristic test system of the protective relay device according to embodiment 1.
Fig. 4 is a diagram showing a connection configuration between a signal conversion unit and a measurement device in the characteristic test system of the protective relay device according to embodiment 1.
Fig. 5 is a diagram showing an example of a display mode of a display unit of the protective relay in the characteristic test system of the protective relay according to embodiment 1.
Fig. 6 is a diagram for explaining a connection structure between the protective relay device and the signal conversion unit in the characteristic test system for the protective relay device according to embodiment 1, and an example of use thereof.
Fig. 7 is a diagram showing an example of an adjustment screen of a display unit of a protective relay in the characteristic test system of a protective relay according to embodiment 1.
Fig. 8 is a diagram showing an operation flow of the characteristic test system of the protective relay according to embodiment 1.
Detailed Description
A preferred embodiment of the characteristic test system of the protective relay device will be described below using the drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals.
Fig. 1 is a block diagram showing a configuration of a characteristic test system of a protective relay device according to embodiment 1.
The protective relay device 1 includes an input circuit 5 to which analog electric power from a power system is input; a measurement circuit 6, the measurement circuit 6 having an a/D converter 61 that converts the analog electric quantity from the input circuit 5 into a digital signal; an arithmetic processing unit (CPU)2 for executing a predetermined arithmetic process using the digital signal from the measurement circuit 6; an output circuit 9, the output circuit 9 generating a signal for operating the circuit breaker 13 based on the determination result of the arithmetic processing unit 2; a display unit 11, the display unit 11 setting display items according to an input from the operation switch unit 10 constituting the operation unit and displaying an output from the arithmetic processing unit 2 according to the set display items; and a test waveform generation circuit 7, the test waveform generation circuit 7 generating a test signal to be input to the measurement circuit 6 based on the processing signal from the arithmetic processing unit 2. The test waveform generation circuit 7 includes a D/a converter 71 for converting the output (digital signal) from the arithmetic processing unit 2 into an analog signal, and an amplifier 72.
Further, the protective relay device 1 includes: a nonvolatile memory 3, the nonvolatile memory 3 storing information necessary for arithmetic processing in the arithmetic processing unit 2; a power supply 4 required for protecting the operation of the relay device 1; and a transmission circuit 8, the transmission circuit 8 constituting a transmission interface (transmission I/F) for transmitting and receiving signals and information between the Programmable Logic Controller (PLC) as the controller 12 provided outside and the arithmetic processing unit 2 via the open field network N.
The input circuit 5 includes a unit that converts an analog electric quantity input from the power system into a level suitable for a subsequent circuit, that is, a current measurement circuit 51 having an auxiliary current transformer (auxiliary CT) for detecting a current of the power system; a voltage measurement circuit 52 having an auxiliary transformer (auxiliary VT) for detecting a voltage of the power system; a zero-phase current measurement circuit 53 having an auxiliary current transformer (auxiliary CT) for detecting a zero-phase current of the power system; and a zero-phase voltage measurement circuit 54 having an auxiliary transformer (auxiliary VT) for detecting a zero-phase voltage of the power system.
The measurement circuit 6 has input switches 62a, 62b, 62c, and 62D constituted by multiplexers for switching signals from the input circuit 5 and signals from the test waveform generation circuit 7 and supplying these signals to the a/D converter 61, and the measurement circuit 6 is connected to the input circuit 5 when the protective relay 1 is normally used, and the measurement circuit 6 is connected to the test waveform generation circuit 7 when a characteristic test of the protective relay 1 is carried out. Further, the input switches 62a, 62b, 62c, 62D and the a/D converter 61 are connected by amplifiers 63a, 63b, 63c, 63D. Further, the measurement circuit 6 has therein a reference power supply (also referred to as a reference power supply IC) of the a/D converter 61.
The circuit breaker 13 is provided in the power system connected to the protective relay device 1, performs an open operation in response to a signal from the output circuit 9, and disconnects the power system, thereby separating the electric equipment connected to the power system from the power system and protecting the electric equipment.
Further, the protective relay device 1 is connected to a voltage measuring device 15 and a time measuring device 16 through a signal conversion unit 14.
The signal conversion unit 14 is configured to have an amplification circuit 140, a variable resistor 141, and isolation circuits 142a, 142b using an isolation transformer, and to supply the output of the test waveform generation circuit 7 through the amplification circuit 140, the variable resistor 141, and the isolation circuit 142a, and to supply a pulse signal corresponding to a time signal for controlling the arithmetic processing section 2 through the isolation circuit 142 b.
The protective relay device 1 has, on the input side, an input terminal portion for connecting the power supply 4, the current measuring circuit 51, the voltage measuring circuit 52, the zero-phase current measuring circuit 53, and the zero-phase voltage measuring circuit 54 to the power system, and has, on the output side, an output terminal portion for connecting the signal converting unit 14, the controller 12, and the circuit breaker 13.
The signal conversion unit 14 has an input terminal section T2 as an input terminal for inputting a test waveform and a pulse signal on the input side, and has an output terminal section T3 as an output terminal for outputting a test waveform and a pulse signal on the output side.
The output terminal portions T1, which output the test waveform signal from the test waveform generation circuit 7 and the pulse output signal from the arithmetic processing unit 2, and the input terminal portion T2 of the signal conversion unit 14 are connected by individual cables C1.
The voltage measuring device 15 and the time measuring device 16 are connected to the output terminal section T3 of the signal conversion unit 14, respectively, and the voltage measuring device 15 measures the signal of the test waveform from the test waveform generation circuit 7, and the time measuring device 16 measures the signal of the pulse output from the arithmetic processing section 2.
Fig. 2 is an external view showing a schematic configuration of the front surface of the protective relay in the characteristic test system for the protective relay according to embodiment 1.
As shown in fig. 2, the protection relay device 1 includes an operation switch section 10, a display section 11, and an output terminal section T1 in a front portion thereof. The operation switch section 10 has operation switches 10A and 10B for switching the display mode and operation switches 10C and 10D for switching the display mode.
Fig. 3 is an external view showing a schematic configuration of a front surface of a signal conversion unit in the characteristic test system of the protective relay device according to embodiment 1.
As shown in fig. 3, the signal conversion unit 14 has, in a front portion thereof, an input terminal portion T2 connected to the protective relay device 1, an output terminal portion T3 connected to the voltage measuring device 15 and the time measuring device 16, an input terminal portion T4 connected to a device for correction as a reference for correcting the signal conversion unit 14, and a power supply terminal portion T5 connected to a power supply of the signal conversion unit 14.
Further, on the panel mounted to the front face portion of the signal conversion unit 14 by screws, connection targets to be connected to respective terminal portions of the input terminal portion T2, the output terminal portion T3, the input terminal portion T4, and the power supply terminal portion T5 are marked in the vicinity of the terminal portions.
Fig. 4 is a diagram showing a connection configuration between a signal conversion unit and a measurement device in the characteristic test system of the protective relay device according to embodiment 1.
As shown in fig. 4, the voltage measuring device 15 and the time measuring device 16 are connected to the output terminal part T3 of the signal converting unit 14. Further, as shown in fig. 1, the input terminal portion T2 of the signal conversion unit 14 is connected to the output terminal portion T1 of the protective relay device 1 through a dedicated cable C1.
Fig. 4 shows a mode in which a voltage measuring device 15 for measuring a signal output from the test waveform generating circuit 7 corresponding to an output from the current measuring circuit 51 in fig. 1 and a time measuring device 16 for measuring a signal of a pulse output from the arithmetic processing unit 2 in fig. 1 are connected to the output terminal unit T3. A measuring device adapted to an output to be measured is connected to the output terminal part T3. For example, fig. 4 shows a manner in which, in the case where the current measurement circuit 51 in fig. 1 changes the input current and outputs a voltage, the voltage is measured by the voltage measurement device 15 for the signal output from the test waveform generation circuit 7 corresponding to the voltage. The same applies to fig. 6 described below.
The voltage measuring device 15 or the time measuring device 16 can check whether or not the output from the test waveform generating circuit 7 or the arithmetic processing unit 2 is a predetermined value required for the characteristic test.
Further, a correction device such as an alternating voltage generator is connected to the input terminal section T4, and the accuracy of the signal conversion unit 14 can be confirmed by a measuring device connected to the output terminal section T3. As a result of checking the accuracy of the signal conversion unit 14, if the accuracy of the signal conversion unit 14 is out of the predetermined range, the signal conversion unit 14 can be brought into an appropriate state by adjusting the variable resistor 141 shown in fig. 1 incorporated in the signal conversion unit 14. For example, the adjustment work of the variable resistor 141 can be performed by removing a panel fixed to the main body of the signal conversion unit 14 with screws.
Fig. 5 is a diagram showing an example of a display mode of a display unit of the protective relay in the characteristic test system of the protective relay according to embodiment 1. An example is shown in which the screen displayed on the display unit 11 is selected by operating the operation switches 10A, 10B, 10C, and 10D provided in the operation switch unit 10 of the protective relay device 1, and the mode is shifted to a pulse signal mode in which the waveform of the test signal can be adjusted and the measurement time of the arithmetic processing unit can be confirmed. The adjustment elements (current, voltage) and time measurement are switched by the operation switch of the operation switch unit 10. The adjustment elements are (a) current waveform adjustment (offset), (b) current waveform adjustment (gain), (c) voltage waveform adjustment (offset), (d) voltage waveform adjustment (gain), and (e) an arithmetic processing unit measurement time output, and the display unit 11 can selectively display a current waveform adjustment screen (offset), a current waveform adjustment screen (gain), a voltage waveform adjustment screen (offset), a voltage waveform adjustment screen (gain), and a time confirmation screen in the direction of the arrow.
Fig. 6 is a diagram showing a connection structure between a protective relay and a signal conversion unit in the characteristic test system for a protective relay according to embodiment 1, and an example of use thereof. As shown in fig. 6, in the protective relay device 1 and the signal conversion unit 14, the output terminal portion T1 of the protective relay device 1 and the input terminal portion T2 of the signal conversion unit 14 are connected by a dedicated cable C1. Further, the voltage measuring device 15 and the time measuring device 16 are connected to the output terminal part T3 of the signal conversion unit 14. Fig. 6 shows, by way of example, a display mode of a signal flowing through a dedicated cable C1 connecting an output terminal portion T1 of the protective relay device 1 and an input terminal portion T2 of the signal conversion unit 14, and shows an example of adjustment (a) of an offset (center voltage of an output waveform), adjustment (B) of a gain (amplitude of the output waveform), and confirmation (C) of a measurement time (pulse output) of the arithmetic processing unit. For example, confirmation can be made by displaying these signals on an oscilloscope connected to the output terminal section T3.
After determining the adjustment elements (a) to (e) illustrated in fig. 5, a transition is made to the adjustment screen of the test waveform. In the adjustment screen, the adjustment value is increased or decreased by operating the switch, and the offset of the output waveform and the amplitude of the waveform are reflected. Although there is no adjustment screen for confirming the measurement time of the arithmetic processing section, the pulse output is performed by the operation of the operation switch on the time confirmation screen of fig. 5.
Fig. 7 is a diagram showing an example of an adjustment screen (current) of a display unit of the protective relay in the characteristic test system of the protective relay according to embodiment 1. The waveform adjustment element 7a and the adjustment value 7b are displayed on the display unit 11. In the adjustment element selection screen in fig. 5, the adjustment element of the test waveform is selected, and after selection, the process shifts to the adjustment screen in fig. 7. The adjustment value is increased or decreased by operating the switch. As shown in fig. 6, the adjustment value is reflected on the output of the test waveform.
Fig. 8 is a diagram showing an operation flow of the characteristic test system of the protective relay according to embodiment 1.
First, as preparation before adjustment, the output terminal section T1 of the protective relay device 1 and the input terminal section T2 of the signal conversion unit 14 are connected by the dedicated cable C1, the signal conversion unit 14 is connected to the protective relay device 1, and the measurement devices such as the voltage measurement device 15 and the time measurement device 16 are connected to the output terminal section T3 of the signal conversion unit 14 (step S11). The time measuring device 16 connected to the signal conversion unit 14 confirms the time of the pulse output of the arithmetic processing unit 2, confirms the measurement time of the arithmetic processing unit 2 (step S12) (see fig. 6), and if the confirmation result is within the range of the predetermined value (yes in step S13), the process proceeds to step S14, and if the confirmation result is not within the range of the predetermined value (no in step S13), the process proceeds to step S15, and it is determined that the protective relay device 1 has failed, the device replacement is performed, and the operation is ended.
In step S14, an output element of a test waveform (see fig. 5) is selected, a current test waveform is output when the output element is a current element (step S16), a voltage test waveform is output when the output element is a voltage element (step S17), a zero-phase current test waveform is output when the output element is a zero-phase current element (step S18), and a zero-phase voltage test waveform is output when the output element is a zero-phase voltage element (step S19).
In step S20, if the amplitude and the offset value of the waveform output in steps S16 to S19 are within the range of prescribed values (yes), the process proceeds to step S21, and if the amplitude and the offset value are not within the range of prescribed values (no), the process proceeds to step S22, amplitude adjustment of the output waveform is performed (see fig. 6), and it returns to step S20.
In step S21, it is determined whether all the waveform adjustments are completed, and if all the waveform adjustments are completed (yes), it proceeds to step S23 and starts a characteristic test, and if all the waveform adjustments are not completed (no), it returns to step S14.
The basic configuration in this embodiment can be configured by providing a measuring device for measuring a test signal from the test waveform generation circuit 7 provided in the protective relay device 1 without interposing the signal conversion unit 14, and by this configuration, the voltage measuring device 15 as the measuring device measures the test waveform of the test signal, thereby making it possible to confirm the soundness of the test signal.
In addition, embodiment 1 has 3 functions as shown below.
(1) The system is provided to be able to confirm the soundness of the test signal generated by the test waveform generation circuit 7 through the signal conversion unit 14, thereby having a function of being able to confirm that the test signal is a test signal in which an output from the tester is simulated. The signal conversion unit is capable of performing a correction, and the test signal is confirmed by the corrected signal conversion unit.
(2) A function of outputting the time measured by the arithmetic processing unit 2 to the outside as a pulse signal is installed. The pulse signal is measured by the time measuring device 16 which has performed the correction. This makes it possible to confirm that the time measured by the arithmetic processing unit 2 is correct.
(3) A function is provided which can confirm the generated test signal and adjust the output of the test signal if the test signal exceeds a predetermined value. A function of adjusting an offset and an amplitude (gain) of an output waveform when a generated test signal deviates from a predetermined value due to component deterioration or the like is mounted. Here, the adjustment value subjected to the waveform adjustment is reflected in the test signal.
By the above-described (1) and (2), the soundness of the test signal generated by the test waveform generation circuit 7 and the soundness of the time measured by the arithmetic processing unit 2 can be confirmed, and the test reliability of the characteristic test system can be improved and the traceability of the characteristic test result can be ensured.
Further, by installing the function of the above (3), a system capable of always inputting a sound test signal and performing a characteristic test can be realized.
The signal conversion unit 14 includes an amplification circuit 140 of an input waveform, insulation circuits 142a and 142b, and a variable resistor 141, each purpose of which is shown in (1) and (2) below.
(1) The output waveform is adjusted by disposing the amplification circuit 140 and the variable resistor 141 in the signal conversion unit. Although the usual magnification is a resistance value of × 1 times, the magnification can be changed by changing the variable resistor 141, and the output waveform can be adjusted. Therefore, when a deviation between the input waveform and the output waveform occurs due to a problem (e.g., deterioration) of the insulation transformers constituting the insulation circuits 142a, 142b, the output waveform is adjusted. Since the deviation of the offset portion of the signal conversion unit 14 is not adjustable, the signal conversion unit itself needs to be replaced.
(2) The internal circuit of the protective relay 1 is protected by the isolation transformer of the isolation circuits 142a and 142 b. When the internal circuit of the protective relay device 1 is directly connected to the voltage measuring device 15 and the time measuring device 16 as the measuring devices without being insulated, for example, electrostatic noise may enter by contact of a human finger. The signal conversion unit 14 and the protective relay device 1 are connected by a connector, and a structure that a human finger does not touch at the time of connection (the connection port is small) is adopted. In a state where the signal conversion unit 14 is connected and the signal conversion unit 14 is insulated from the protective relay device 1, the voltage measurement device 15 and the time measurement device 16 as measurement devices are connected, and the output waveform is confirmed.
If the test waveform is measured only by the voltage measuring device 15 as the measuring device, the signal converting unit 14 is not required.
The insulation transformer is disposed inside the protective relay device 1, or even the signal conversion unit constituted only by the insulation transformer can perform measurement without problems.
However, in the case of such a configuration, the following problems (1) and (2) need to be considered.
(1) The case where the insulation transformer is disposed inside the protective relay device 1
In the case where the test waveform is measured by the measuring device, when the test waveform deviates from the normal value range, it cannot be determined whether the test waveform deviates from the normal value due to a problem with the test signal generated by the protective relay device 1 or deviates from the normal value due to a problem (e.g., deterioration) of the insulation transformer.
(2) Case of a signal conversion unit consisting of an insulation transformer only
Although the soundness of the signal conversion unit itself can be confirmed by confirming the input/output of the signal conversion unit 14, since the output value of the signal conversion unit itself cannot be adjusted, when there is a problem in soundness confirmation, the signal conversion unit needs to be replaced.
These problems can be solved by providing a signal conversion means as in embodiment 1.
Although the present application describes exemplary embodiments, the various features, modes and functions described in the embodiments are not limited to being applied to specific embodiments, but can be applied to the embodiments individually or in various combinations.
Therefore, countless modifications not exemplified are conceivable within the technical scope disclosed in the specification of the present application. For example, the case where at least one of the components is modified, added, or omitted is also included.
Description of the reference symbols
The device comprises a protective relay device 1, an arithmetic processing unit 2, an input circuit 5, a measuring circuit 6, a test waveform generating circuit 7, an output circuit 9, an operation switch unit 10, a display unit 11, a signal conversion unit 14, a voltage measuring device 15 and a time measuring device 16.
Claims (4)
1. A characteristic test system of a protective relay device, the protective relay device comprising: an input circuit to which an analog electric quantity from an electric power system is input; a measurement circuit having an A/D converter that converts the analog electrical quantity from the input circuit into a digital signal; an arithmetic processing unit that executes arithmetic processing using the digital signal from the measurement circuit; an output circuit that generates a signal for operating a breaker provided in the power system based on a determination result of the arithmetic processing unit; a display unit that sets a display item based on an input from an operation switch unit and displays an output from the arithmetic processing unit based on the set display item; and a test waveform generating circuit provided in the protective relay device, for generating a test signal to be input to the measuring circuit based on a processing signal from the arithmetic processing unit,
the characteristic test system for a protective relay device includes a measuring device that measures a test signal generated by the test waveform generating circuit.
2. The characteristic test system of a protective relay according to claim 1,
the measuring device is a voltage measuring device.
3. The characteristic test system of a protective relay according to claim 1 or 2,
the measuring device is provided with a signal conversion unit which is arranged on the input side of the measuring device and corrects the test signal from the test waveform generating circuit.
4. The characteristic test system of a protective relay according to claim 3,
the time measurement device measures a time signal used in the arithmetic processing unit.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2018/020810 WO2019229886A1 (en) | 2018-05-30 | 2018-05-30 | Characteristic testing system for protection relay device |
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| Publication Number | Publication Date |
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| CN112154340A true CN112154340A (en) | 2020-12-29 |
| CN112154340B CN112154340B (en) | 2024-03-19 |
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| CN201880093647.XA Active CN112154340B (en) | 2018-05-30 | 2018-05-30 | Characteristic test system of protective relay device |
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|---|---|
| JP (1) | JP6456573B1 (en) |
| KR (1) | KR102462925B1 (en) |
| CN (1) | CN112154340B (en) |
| PH (1) | PH12020552022A1 (en) |
| TW (1) | TWI670504B (en) |
| WO (1) | WO2019229886A1 (en) |
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| CN109765447B (en) * | 2019-01-29 | 2021-12-21 | 国网冀北电力有限公司唐山供电公司 | Automatic testing method for relay protection of intelligent substation |
| CN110687375B (en) * | 2019-10-11 | 2021-08-20 | 南京能云电力科技有限公司 | Parallel automatic test system and method for relay protection device |
| CN113075910A (en) * | 2021-02-25 | 2021-07-06 | 南京南瑞继保电气有限公司 | Intelligent testing system and method for complete machine retest of relay protection device |
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| JPWO2019229886A1 (en) | 2020-06-18 |
| KR102462925B1 (en) | 2022-11-04 |
| TW202004207A (en) | 2020-01-16 |
| KR20210005089A (en) | 2021-01-13 |
| CN112154340B (en) | 2024-03-19 |
| JP6456573B1 (en) | 2019-01-23 |
| PH12020552022A1 (en) | 2021-06-14 |
| TWI670504B (en) | 2019-09-01 |
| WO2019229886A1 (en) | 2019-12-05 |
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