CN112154340B - Characteristic test system of protective relay device - Google Patents
Characteristic test system of protective relay device Download PDFInfo
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- CN112154340B CN112154340B CN201880093647.XA CN201880093647A CN112154340B CN 112154340 B CN112154340 B CN 112154340B CN 201880093647 A CN201880093647 A CN 201880093647A CN 112154340 B CN112154340 B CN 112154340B
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- 238000012360 testing method Methods 0.000 title claims abstract description 130
- 230000001681 protective effect Effects 0.000 title claims abstract description 82
- 238000012545 processing Methods 0.000 claims abstract description 39
- 238000006243 chemical reaction Methods 0.000 claims description 45
- 238000005259 measurement Methods 0.000 claims description 37
- 238000012790 confirmation Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 12
- 238000009413 insulation Methods 0.000 description 9
- 230000006870 function Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 230000005856 abnormality Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000012937 correction Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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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
-
- 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
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. Comprises 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 operation processing part (2) of a 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 on the protective relay device that protects an electric facility from an abnormality of an electric power system.
Background
The protective relay apparatus is an apparatus for detecting an abnormality such as an accident or a malfunction in the electric power system and separating an electric device connected to the electric power system from the electric power system to protect the electric device.
In order to maintain the proper protection function of the protective relay device, it is necessary to perform characteristic tests on the protective relay device at regular intervals.
In such a characteristic test of the protective relay, an abnormality is detected by providing an input to the protective relay that is a reference for operating the protective function of the protective relay (also referred to as a set value, hereinafter the same) of a predetermined value or more, and when the time for which the abnormality is detected continues for a predetermined period of time, the protective operation is confirmed. 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 portion of a protective relay apparatus, 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 apparatus (for example, refer to patent document 1).
Prior art literature
Patent literature
Patent document 1: japanese patent 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. In addition, in the case of performing a characteristic test by using a test waveform generating circuit built in a protection relay device, since the system cannot confirm the soundness of a test signal generated by the test waveform generating circuit corresponding to a test signal simulating the output of the tester, it is impossible to determine whether or not protection is performed under a predetermined condition based on the test signal input from the test waveform generating circuit.
The present application discloses a technique for solving the above-described problems, and an object thereof is to provide a characteristic test system of a protective relay device which does not require preparation of a tester externally separately from the protective relay device, and which can confirm soundness of a test signal generated by a test waveform generating circuit provided inside the protective relay device when the characteristic test is performed using the test waveform generating circuit.
Technical means for solving the technical problems
In a characteristic test system of a protective relay apparatus disclosed in the present application, the protective relay apparatus 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 the analog power from the input circuit into a digital signal; an arithmetic processing unit that performs arithmetic processing using the digital signal from the measurement circuit; an output circuit that generates a signal for operating the circuit breaker based on a determination result of the operation processing unit; a display unit that sets display items according to an input from the operation switch unit, and displays an output from the operation processing unit according to the set display items; and a test waveform generation circuit provided in the protective relay device and generating a test signal input to the measurement circuit based on the processing signal from the operation processing unit, wherein the characteristic test system of the protective relay device includes a measurement device that measures the test signal generated by the test waveform generation circuit.
Effects of the invention
According to the characteristic test system of the protective relay device disclosed in the present application, by providing the measuring device for measuring the test signal generated by the test waveform generating circuit, the soundness of the test signal generated by the test waveform generating circuit can be confirmed.
Drawings
Fig. 1 is a block diagram showing the configuration of a characteristic test system of a protective relay device according to embodiment 1.
Fig. 2 is an external view showing a schematic front structure of the protective relay in the characteristic test system of the protective relay according to embodiment 1.
Fig. 3 is an external view showing a schematic front structure of a signal conversion unit in the characteristic test system of the protective relay device of embodiment 1.
Fig. 4 is a diagram showing a connection structure of a signal conversion unit and a measuring device in the characteristic test system of the protective relay device of embodiment 1.
Fig. 5 is a diagram showing an example of a display mode of a display unit of the protective relay device in the characteristic test system of the protective relay device according to embodiment 1.
Fig. 6 is a diagram for explaining a connection structure between a protective relay device and a signal conversion unit and a use example thereof in the characteristic test system of the protective relay device according to embodiment 1.
Fig. 7 is a diagram showing an example of an adjustment screen of a display unit of the protective relay device in the characteristic test system of the protective relay device according to embodiment 1.
Fig. 8 is a diagram showing an operation flow of the characteristic test system of the protective relay device according to embodiment 1.
Detailed Description
A preferred embodiment of the characteristic test system of the protective relay will be described below using the drawings. The same or corresponding portions in the drawings are denoted by the same reference numerals.
Embodiment 1.
Fig. 1 is a block diagram showing the 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, the input circuit 5 being inputted with an analog electric quantity from an electric power system; a measurement circuit 6, the measurement circuit 6 having an a/D converter 61 that converts analog electric power from the input circuit 5 into a digital signal; a Calculation Processing Unit (CPU) 2, the Calculation Processing Unit (CPU) 2 executing a predetermined calculation 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, wherein the display unit 11 sets display items according to an input from the operation switch unit 10 constituting the operation unit, and displays an output from the operation 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 input to the measurement circuit 6 based on the processing signal from the arithmetic processing section 2. The test waveform generation circuit 7 is configured to include a D/a converter 71 and an amplifier 72 for converting an output (digital signal) from the arithmetic processing section 2 into an analog signal.
Further, the protective relay apparatus 1 includes: a nonvolatile memory 3, the nonvolatile memory 3 storing information required for the arithmetic processing in the arithmetic processing unit 2; a power supply 4 required for operating the protective 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 a Programmable Logic Controller (PLC) as a 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 electric power system into a level suitable for a subsequent circuit, i.e., a current measurement circuit 51 having an auxiliary converter (auxiliary CT) for detecting a current of the electric 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 the zero-phase voltage of the power system.
The measurement circuit 6 has input switches 62a, 62b, 62c, and 62D constituted by multiplexers for switching the signals from the input circuit 5 and the 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 device 1 is generally used, and the measurement circuit 6 is connected to the test waveform generation circuit 7 when the characteristic test of the protective relay device 1 is conducted. Further, the input switches 62a, 62b, 62c, 62D and the a/D converter 61 are connected through amplifiers 63a, 63b, 63c, 63D. Further, the measurement circuit 6 has 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 electric power system connected to the protective relay device 1, performs an opening operation based on a signal from the output circuit 9, and separates an electric device connected to the electric power system from the electric power system to protect the electric device.
Furthermore, the protective relay apparatus 1 is connected to the voltage measuring apparatus 15 and the time measuring apparatus 16 through the signal converting unit 14.
The signal conversion unit 14 is configured to have an amplifying circuit 140, a variable resistor 141, and insulating circuits 142a, 142b using an insulating transformer, and supplies the output of the test waveform generating circuit 7 through the amplifying circuit 140, the variable resistor 141, and the insulating circuit 142a, and supplies a pulse signal corresponding to a time signal for controlling the arithmetic processing section 2 through the insulating circuit 142 b.
The protective relay apparatus 1 has an input terminal portion for connecting the power source 4, the current measurement circuit 51, the voltage measurement circuit 52, the zero-phase current measurement circuit 53, and the zero-phase voltage measurement circuit 54 to the power system on the input side, and an output terminal portion for connecting the signal conversion unit 14, the controller 12, and the circuit breaker 13 on the output side.
The signal conversion unit 14 has an input terminal portion T2 as an input terminal for inputting a test waveform and a pulse signal on the input side, and an output terminal portion T3 as an output terminal for outputting a test waveform and a pulse signal on the output side.
The output terminal T1 of the signal output from the test waveform generating circuit 7 and the input terminal T2 of the signal converting unit 14 are connected to each other by the dedicated cable C1.
The voltage measuring device 15 and the time measuring device 16 are connected to the output terminal portion T3 of the signal converting unit 14, respectively, and the voltage measuring device 15 measures the signal of the test waveform from the test waveform generating circuit 7, and the time measuring device 16 measures the signal of the pulse output from the arithmetic processing portion 2.
Fig. 2 is an external view showing a schematic front structure of the protective relay in the characteristic test system of the protective relay according to embodiment 1.
As shown in fig. 2, the protective relay 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 front structure of a signal conversion unit in the characteristic test system of the protective relay device of embodiment 1.
As shown in fig. 3, the front portion of the signal conversion unit 14 has an input terminal portion T2 connected to the protective relay device 1, an output terminal portion T3 connected to the voltage measurement device 15 and the time measurement device 16, an input terminal portion T4 connected to a correction device 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 a panel attached to the front surface portion of the signal conversion unit 14 by screws, connection objects connected to 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 respective terminal portions.
Fig. 4 is a diagram showing a connection structure of a signal conversion unit and a measuring device in the characteristic test system of the protective relay device of embodiment 1.
As shown in fig. 4, the voltage measuring device 15 and the time measuring device 16 are connected to the output terminal portion 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.
In fig. 4, a manner is shown in which the voltage measuring device 15 and the time measuring device 16 are connected to the output terminal portion T3, the voltage measuring device 15 being configured to measure a signal output from the test waveform generating circuit 7 corresponding to an output from the current measuring circuit 51 in fig. 1, and the time measuring device 16 being configured to measure a signal of a pulse output from the arithmetic processing portion 2 shown in fig. 1. A measuring device suitable for an output to be measured is connected to the output terminal portion T3. For example, fig. 4 shows a manner in which, when the current measuring circuit 51 in fig. 1 changes an input current and outputs a voltage, the voltage measuring device 15 measures the voltage for a signal output from the test waveform generating 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 confirm 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-current voltage generator is connected to the input terminal portion T4, and the accuracy of the signal conversion unit 14 can be confirmed by a measuring device connected to the output terminal portion T3. As a result of this, if the accuracy of the signal conversion unit 14 is confirmed and the accuracy of the signal conversion unit 14 is out of the predetermined range, the variable resistor 141 shown in fig. 1 incorporated in the signal conversion unit 14 is adjusted, whereby the signal conversion unit 14 can be brought into an appropriate state. For example, the adjustment work of the variable resistor 141 can be performed by removing a panel screwed to the main body of the signal conversion unit 14.
Fig. 5 is a diagram showing an example of a display mode of a display unit of the protective relay device in the characteristic test system of the protective relay device according to embodiment 1. An example of selecting a screen displayed on the display unit 11 by operating the operation switches 10A, 10B, 10C, 10D provided in the operation switch unit 10 of the protection relay device 1 is shown, and the mode is shifted to a mode in which the test signal waveform can be adjusted and the pulse signal of the operation processing unit measurement time 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) calculation 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 arrow direction.
Fig. 6 is a diagram showing a connection structure between a protective relay device and a signal conversion unit and a use example thereof in the characteristic test system of the protective relay device according to embodiment 1. 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 portion T3 of the signal converting unit 14. Fig. 6 shows, by way of example, a display system of a signal flowing through the dedicated cable C1 connecting the output terminal T1 of the protective relay device 1 and the input terminal 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 an output waveform), and confirmation (C) of a measurement time (pulse output) by the arithmetic processing unit. For example, the confirmation can be performed by displaying these signals on an oscilloscope connected to the output terminal portion T3.
After determining the adjustment elements (a) to (e) illustrated in fig. 5, 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, thereby reflecting the offset of the output waveform and the amplitude of the waveform. Although there is no adjustment screen for confirming the measurement time of the arithmetic processing unit, pulse output is performed by an operation switch operation 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 device in the characteristic test system of the protective relay device 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 the selection, the screen is shifted 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 device according to embodiment 1.
First, as preparation before adjustment, 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 through 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 portion T3 of the signal conversion unit 14 (step S11). The time measuring device 16 connected to the signal converting means 14 confirms the time of the pulse output of the operation processing unit 2, confirms the measurement time of the operation 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), proceeds to step S14, and if the confirmation result is not within the range of the predetermined value (no in step S13), proceeds to step S15, and determines that the protective relay device 1 has failed, performs device replacement, and ends the operation.
In step S14, an output element of the test waveform is selected (see fig. 5), the current test waveform is output when the output element is a current element (step S16), the voltage test waveform is output when the output element is a voltage element (step S17), the zero-phase current test waveform is output when the output element is a zero-phase current element (step S18), and the 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 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 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 the process returns to step S20.
In step S21, it is judged whether all waveform adjustment is completed, and if all waveform adjustment is completed (yes), it proceeds to step S23 and starts the characteristic test, and if all waveform adjustment is not completed (no), it returns to step S14.
The basic structure in this embodiment can be constituted by providing a measuring device for measuring a test signal from the test waveform generating circuit 7 provided in the protective relay device 1 without interposing the signal converting unit 14, and according to this structure, the soundness of the test signal can be confirmed by measuring the test waveform of the test signal by the voltage measuring device 15 as the measuring device.
In embodiment 1, the following 3 functions are provided.
(1) The system is configured to be able to confirm the soundness of the test signal generated by the test waveform generating circuit 7 via the signal converting unit 14, and thus has a function of confirming that the test signal is a test signal whose output from the tester is simulated. The signal conversion unit can make a correction, and the test signal is confirmed by the signal conversion unit which has made the correction.
(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 corrected time measuring device 16. This can confirm that the time measured by the arithmetic processing unit 2 is correct.
(3) A function of confirming the generated test signal and adjusting the output of the test signal when the test signal exceeds a predetermined value is provided. When the generated test signal deviates from a predetermined value due to component degradation or the like, a function of adjusting the offset and amplitude (gain) of the output waveform is provided. Here, the adjustment value subjected to waveform adjustment is reflected in the test signal.
By the above (1) and (2), the soundness of the test signal generated by the test waveform generating circuit 7 can be confirmed, and the soundness of the time measured by the arithmetic processing section 2 can be confirmed, so that 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 (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 amplifying circuit 140, insulating circuits 142a and 142b, and a variable resistor 141 of the input waveforms, the respective purposes of which are as shown in (1) and (2) below.
(1) The output waveform is adjusted by configuring the amplifying circuit 140 and the variable resistor 141 within the signal conversion unit. Although the usual amplification factor is a resistance value of x 1 times, the amplification factor can be changed by changing the variable resistor 141, and the output waveform can be adjusted. Accordingly, when a deviation between the input waveform and the output waveform occurs due to a problem (e.g., degradation) 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, it is necessary to replace the signal conversion unit itself.
(2) The internal circuit of the protection relay device 1 is protected by the insulation transformers of the insulation circuits 142a, 142 b. When the internal circuit of the protective relay device 1 is directly connected to the voltage measuring device 15, the time measuring device 16 as a measuring device without insulation, for example, electrostatic noise may enter through contact of a human finger. The signal conversion unit 14 and the protective relay apparatus 1 are connected by a connector, and a structure is adopted in which a human finger does not come into contact at the time of connection (a connection port is small). In a state where the signal conversion unit 14 is connected and the signal conversion unit 14 is insulated from the protective relay apparatus 1, the voltage measurement apparatus 15 and the time measurement apparatus 16 as measurement apparatuses 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 arranged inside the protective relay device 1, or even a signal conversion unit composed of only the insulation transformer can perform measurement without problems.
However, in the case of such a structure, the following problems (1) and (2) need to be considered.
(1) In the case where an insulation transformer is disposed inside the protective relay 1
In the case of measuring the test waveform by the measuring device, when the test waveform deviates from the normal value range, it cannot be judged whether the test signal generated by the protective relay device 1 deviates from the normal value due to a problem or the insulation transformer deviates from the normal value due to a problem (e.g., deterioration).
(2) In the case of signal conversion units consisting of insulating transformers 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.
By providing the signal conversion means as in embodiment 1, these problems can be solved.
Although the present application describes exemplary embodiments, the various features, modes and functions described in the embodiments are not limited to application to specific embodiments but can be applied to the embodiments alone or in various combinations.
Accordingly, numerous modifications are contemplated as not illustrated within the scope of the technology disclosed in the present specification. For example, the case where at least one component is deformed, added, or omitted is also included.
Description of the reference numerals
A protective relay device 1, a computing and processing part 2, an input circuit 5, a measuring circuit 6, a test waveform generating circuit 7, an output circuit 9, an operation switch part 10, a display part 11, a signal conversion unit 14, a voltage measuring device 15 and a time measuring device 16.
Claims (2)
1. A characteristic testing 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 an analog power amount from the input circuit into a digital signal; an arithmetic processing unit that performs arithmetic processing using the digital signal from the measurement circuit; an output circuit that generates a signal for operating a circuit breaker provided in the power system based on a determination result of the arithmetic processing unit; an operation switch section operable to switch a current waveform offset adjustment screen, a current waveform gain adjustment screen, a voltage waveform offset adjustment screen, a voltage waveform gain adjustment screen, or a time confirmation screen; a display unit that sets a display item according to an input from the operation switch unit, and displays an output from the arithmetic processing unit according to the set display item; and a test waveform generating circuit provided inside the protective relay device, the test waveform generating circuit generating a test signal input to the measuring circuit based on a processing signal from the arithmetic processing unit,
the characteristic test system of the protective relay device comprises: a voltage measuring device that measures the test signal generated by the test waveform generating circuit to confirm whether the test signal is a prescribed value required for the characteristic test; and a signal conversion unit provided on an input side of the voltage measuring device and correcting a test signal from the test waveform generating circuit,
the signal conversion unit includes an amplifying circuit, a variable resistor, and an insulating circuit.
2. The characteristic testing system of a protective relay device according to claim 1, wherein,
the time measuring device is provided with a time measuring device which measures a time signal for 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 |
|---|---|
| CN112154340A CN112154340A (en) | 2020-12-29 |
| CN112154340B true 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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| TW202004207A (en) | 2020-01-16 |
| KR20210005089A (en) | 2021-01-13 |
| JPWO2019229886A1 (en) | 2020-06-18 |
| CN112154340A (en) | 2020-12-29 |
| KR102462925B1 (en) | 2022-11-04 |
| TWI670504B (en) | 2019-09-01 |
| WO2019229886A1 (en) | 2019-12-05 |
| PH12020552022A1 (en) | 2021-06-14 |
| JP6456573B1 (en) | 2019-01-23 |
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