JP6548449B2 - Operation test system of protective relay device - Google Patents

Description

  The present invention relates to an operation test system of a protective relay device which detects a system abnormality and protects an electrical installation of the system from the system abnormality.

  In recent years, protection relays are required to have higher reliability. Therefore, in the conventional digital protective relay device, an operation test system of the protective relay device for improving the reliability is adopted. System monitoring is performed in the operation test system of the protective relay device. An abnormal operation is determined when an operation that can not usually be continued for a certain period of time. In the operation test system of the protective relay device, the system abnormality is determined in the measuring device through the transformer and the current transformer, the voltage RST phase, the current RST phase and the zero phase current, and the zero phase voltage. The operation test system of the protective relay device has a function of confirming its soundness. Even if the equipment such as the control center is in operation, the test signal for soundness confirmation and the input signal from the system are monitored respectively, and the soundness confirmation and equipment monitoring and protection of the protective relay device by the protection characteristic test are possible. I assume.

International Publication WO2013 / 175846 Pamphlet (paragraph [0033], FIG. 11)

The operation test system of the protective relay device shown in Patent Document 1 has a circuit configuration as shown in FIG. 4, and switching of the multiplexer 8 switches the test signal input from the test waveform generation circuit 12 and the power system. The actual input waveform of is alternately monitored. For example, when monitoring the actual input voltage of the RS phase transformed by the three-phase transformer 4 and the CPU detects an abnormal voltage, it outputs a trip signal and operates the circuit breaker through the mechanical relay 13 ing. Further, the CPU sends a signal to an external PLC (Programmable Logic Controller) 15 through the transmission circuit 14, and the PLC controls a lamp or a display screen provided in a control center or the like to notify that a system error has occurred. However, when the wiring path monitoring the RS phase voltage of the protective relay operation test system fails at the timing when the multiplexer 8 is switched to the three-phase transformer 4 side, the input signal from the system is monitored Even though the voltage is normal, there is a possibility of erroneous tripping. In addition, not only the voltage RS phase but also the voltage ST phase, the voltage TR phase, the current R phase, the current S phase, the current T phase, the zero phase current, and the zero phase voltage may be erroneously tripped in the same manner. was there.

  The present invention has been made to solve the above-described problems, and while constantly monitoring the power system, it is possible to determine whether or not the protective relay device has a failure, and erroneous trips are less likely to occur. It is an object of the present invention to obtain an operation test system for a protective relay device.

An operation test system of a protection relay device according to the present invention is an operation test system of a protection relay device that detects a system abnormality and protects an electric installation of the system from the system abnormality, receiving an input signal from the system and measuring an analog measurement value. , An A / D converter for converting the analog measurement values output from the first and second analog measurement circuits into digital signals, and a test on the protective relay device A test signal generating circuit for generating a signal, and first and second switches provided between the test signal and an input signal from the system, which are respectively provided in front of the first and second analog measurement circuits of the protective relay device. A changeover switch and the digital signal from the A / D converter are taken as an input, and protection or control of the protection relay device based on the protection operation and the operation result An indication is issued, the switching timing of the changeover switch is controlled, and the test signal input via the first and second analog measurement circuits and the A / D converter and directly from the test signal generation circuit A CPU for comparing the test signal to be input and monitoring the presence or absence of abnormality of the first and second analog measurement circuits and the A / D converter; and the first analog measurement circuit and the A / D converter When the test signal is input to the first wiring path when monitoring the presence / absence of abnormality of the first wiring path of the second analog measuring circuit and the second wiring path of the A / D converter, the second wiring When the input signal from the system is input to the path and the test signal is input to the second wiring path, the input signal from the system is input to the first wiring path to constantly monitor the system abnormality. Rutotomoni, the first monitors abnormality presence or absence of the wiring path and the second wiring path, when said test signal to any of the first wire path and the second wiring path is not input, the first wiring An input signal from the system is input to both the path and the second wiring path, and the abnormality of the system is monitored by the logical product of the outputs of the first wiring path and the second wiring path .

  Further, the test signal from the test signal generation circuit and the input signal from the system are alternately input to the first wiring path, and the test signal generation circuit from the second wiring path. The test signal and the input signal from the system are alternately input to monitor the presence or absence of abnormality in the first wiring path and the second wiring path.

  According to the present invention, while constantly monitoring the system, it is possible to determine whether or not the protective relay device is broken, and it is possible to obtain an operation test system of the protective relay device that is unlikely to cause an erroneous trip.

It is a figure which shows the structure of the operation test system of the protection relay apparatus in Embodiment 1 of this invention. 5 is a flowchart showing processing of a CPU in the first embodiment. FIG. 5 is a timing chart of input signals from the changeover switch and the system in the first embodiment. It is a figure which shows the structure of the operation test system of the conventional protective relay device.

Embodiment 1
The operation test system of the protective relay device according to the first embodiment of the present invention is, as shown in FIG. 1, a three-phase transformer 4 connected to R phase 1, S phase 2 and T phase 3, amplifier 9, A / D. The converter 10, the CPU 11, the test waveform generation circuit (test signal generation circuit) 12, the mechanical relay 13, and the transmission circuit 14 are included. In addition, RS phase voltage A circuit switch 16 (switching switch), RS phase voltage B circuit switch 17 (switching switch), ST phase voltage A circuit switch 18 (switching switch), ST phase voltage B circuit 19 (switching switch), A TR phase voltage A circuit switch 20 (switching switch) and a TR phase voltage B circuit switch 21 (switching switch) are provided. The amplifier 9 is an analog measurement circuit that amplifies a signal input via the changeover switch, removes noise by a filter circuit, and outputs an analog measurement value. The CPU 11 takes in a digital signal from the A / D converter 10 as an input, issues a protection calculation of the protection relay device and issues a protection or control instruction based on the calculation result, and controls the switching timing of the changeover switch, A test signal input via the analog measurement circuit and the A / D converter 10 is compared with a test signal directly input from the test waveform generation circuit 12 to monitor the presence or absence of an abnormality in the analog measurement circuit and the A / D converter .

  In FIG. 1, 22 is an RS phase voltage A circuit, 23 is an RS phase voltage B circuit, 24 is an ST phase voltage A circuit, 25 is an ST phase voltage B circuit, 26 is a TR phase voltage A circuit, 27 is a TR phase voltage B It is a circuit. Sixteen to twenty-one switches, twenty-two to twenty-seven circuits, an amplifier (analog measurement circuit) 9 and an A / D converter 10 constitute a dual measurement apparatus for a protective relay operation test system. For example, the RS phase voltage A circuit 22 forms a first wiring path by the switch 16, the analog measurement circuit, and the A / D converter 10. The RS phase voltage B circuit 23 includes the switch 17, the analog measurement circuit, and the A / D converter A second wiring path is constituted by 10, and a redundant wiring path is constituted by the first wiring path and the second wiring path. Similarly, the ST phase voltage A circuit 24 constitutes a first wiring path by the switch 18, the analog measurement circuit and the A / D converter 10. The ST phase voltage B circuit 25 comprises the switch 19, the analog measurement circuit and the A / D. The converter 10 configures a second wiring path, and the first wiring path and the second wiring path configure a redundant wiring path. The TR phase voltage A circuit 26 constitutes a first wiring path by the switch 20, the analog measurement circuit and the A / D converter 10. The TR phase voltage B circuit 27 comprises the switch 21, the analog measurement circuit and the A / D converter A second wiring path is constituted by 10, and a redundant wiring path is constituted by the first wiring path and the second wiring path.

  Now, as shown in FIG. 1, when the switch 16 is turned on to the test waveform generation circuit side in the RS phase voltage A circuit 22, the RS phase voltage A circuit 22 generates the inspection waveform generated by the test waveform generation circuit 12. To ensure circuit integrity. At this time, in the RS phase voltage B circuit 23, the real input side of the three-phase transformer 4 is turned ON, and the real input signal from the grid is monitored.

  Here, the processing of the CPU at the failure check timing of the RS phase voltage A circuit 22 will be described with reference to FIG. 2 and FIG. First, when the RS phase voltage A circuit 22 does not perform a failure check (S1, No), if the RS phase voltage B circuit 23 also does not have a failure check, the RS phase voltage A circuit 22 and the RS phase voltage B circuit 23 The system is monitored by taking the AND condition (logical product) of the actual input voltages of (S3 to S6). That is, the RS phase voltage A circuit switch 16 and the RS phase voltage B circuit switch 17 are turned on in S2 in S2, the real phase is taken in in S3 by the RS phase voltage A circuit 22 and the RS phase voltage B circuit 23, TRIP is output under the AND condition of TRIP of the RS phase voltage A circuit 22 and the RS phase voltage B circuit 23 in S6. In addition, when the RS phase voltage A circuit 22 does not perform a fault check and the RS phase voltage B circuit 23 also does not perform a fault check, in FIG. 3, the switch 16 is an actual input side and the switch 17 is an actual input side. This is when the monitoring condition of the RS phase voltage A circuit 22 is an actual input measurement and the monitoring condition of the RS phase voltage B circuit 23 is an actual input measurement.

  In FIG. 2, when the RS phase voltage A circuit 22 carries out a fault check (S1, Yes), the RS phase voltage A circuit switch 16 is turned ON to the inspection waveform (test waveform generation circuit) side (S7), The RS phase voltage B circuit switch 17 is turned on to the actual input (input signal from the system) side (S8). Then, the inspection waveform is taken in from the RS phase voltage A circuit 22 (S9), and it is judged whether or not the RS phase voltage A circuit 22 is faulty (S10). If there is a failure, an error output indicating that the RS phase voltage A circuit 22 is faulty is output (S11), and the RS phase voltage A circuit switch 16 is fixed on the inspection waveform side (S12). 17 is fixed to the actual input side from the system (S13). The RS phase voltage B circuit switch 17 is kept fixed to the actual input side from the system until replacement of the failed RS phase voltage A circuit 22 is completed. As a result, when one of the wiring paths fails, an input signal from the system is input to the other wiring path to continuously monitor the system abnormality.

  Next, following S7 to S8, when the inspection waveform is input to the RS phase voltage A circuit 22 at S9, an actual input is input to the RS phase voltage B circuit 23 (S14). The RS phase voltage B circuit 23 determines the presence or absence of a system abnormality (S15). Generates TRIP output if there is an abnormality in the system (S16)

  Next, when the RS phase voltage B circuit switch 17 is turned on to the inspection waveform side, the RS phase voltage A circuit switch 16 is turned on to the real input side, and the RS phase voltage A circuit 22 monitors the real input. By switching the inspection waveform generated by the test waveform generation circuit 12 in this manner as shown by the switches 16 and 17 in FIG. 3, the system abnormality is constantly monitored, and the duplicated first wiring path and 2) It is possible to monitor the presence or absence of abnormality in the wiring path. The switch switching timing at this time is, for example, every hour.

  The RS phase voltage A circuit (first wiring path) monitoring state and the RS phase voltage B circuit (second wiring path) monitoring state will be described with reference to FIG. 3. The presence or absence of abnormality in the first wiring path and the second wiring path When monitoring a test signal (test circuit A) that is an inspection waveform to the first wiring path, input an input signal from the system (actual input measurement) to the second wiring path, and When a test signal (B circuit test) is input to the path, an input signal (actual input measurement) from the system is input to the first wiring path to constantly monitor the system abnormality, and the first wiring path and the second It monitors the wiring path for abnormalities. Then, the test signal from the test signal generation circuit and the input signal from the system are alternately input to the first wiring path, and the test signal from the test signal generation circuit and the system from the second wiring path. Input signals are alternately input to monitor the presence or absence of abnormality in the first wiring path and the second wiring path. As described above, the system abnormality is constantly monitored and the presence / absence of abnormality of the first wiring path and the second wiring path are constantly monitored by the dual measurement circuit (the first wiring path and the second wiring path) of the RS phase voltage. Can.

  Also, for example, when the ST phase voltage A circuit 24 takes in the inspection waveform and the CPU 11 determines that it is abnormal, the waveform data of the ST phase voltage A circuit 24 thereafter is ignored, and the actual input It is assumed that monitoring is not performed. Since the monitoring of the actual input is performed by the ST phase voltage B circuit until the protective relay replacement, the facility will not be unprotected.

Similarly, by doubling the secondary side of three-phase current transformer 5, zero-phase current transformer 6, and zero-phase transformer 7, three-phase voltage, three-phase current, zero-phase current, and zero-phase voltage By constantly monitoring the actual input, the equipment will not be unprotected.
In the present invention, within the scope of the invention, the embodiment can be appropriately modified or omitted.

1 R phase 2 S phase 3 T phase 4 three phase transformer 5 three phase current transformer 6 zero phase current transformer 7 zero phase transformer 8 multiplexer 9 amplifier 10 A / D converter 11 CPU
12 Test waveform generation circuit 13 Mechanical relay 14 Transmission circuit 15 PLC
16 RS Phase Voltage A Circuit Switch 17 RS Phase Voltage B Circuit Switch 18 ST Phase Voltage A Circuit Switch 19 ST Phase Voltage B Circuit Switch 20 TR Phase Voltage A Circuit Switch 21 TR Phase Voltage B Circuit Switch 22 RS Phase Voltage A Circuit 23 RS Phase voltage B circuit 24 ST phase voltage A circuit 25 ST phase voltage B circuit 26 TR phase voltage A circuit 27 TR phase voltage B circuit

Claims (3)

In the operation test system of a protective relay device that detects a system abnormality and protects the system's electrical equipment from the system abnormality,
First and second analog measurement circuits that receive an input signal from the system and output an analog measurement value;
An A / D converter for converting the analog measurement values output from the first and second analog measurement circuits into digital signals;
A test signal generation circuit that generates a test signal for the protective relay device;
First and second changeover switches respectively provided on the front stage of the first and second analog measurement circuits of the protective relay device, and switching between the test signal and the input signal from the system;
The digital signal from the A / D converter is taken as an input, and an instruction for protection or control based on the protection calculation of the protection relay device and the calculation result is issued, and the switching timing of the changeover switch is controlled, The first and second test signals input via the first and second analog measurement circuits and the A / D converter are compared with the test signals directly input from the test signal generation circuit. An analog measurement circuit and a CPU for monitoring the presence or absence of an abnormality of the A / D converter;
When monitoring the presence or absence of abnormality of the first analog measurement circuit, the first wiring path of the A / D converter, and the second wiring path of the second analog measurement circuit and the A / D converter,
When the test signal is input to the first wiring path, an input signal from the system is input to the second wiring path, and when the test signal is input to the second wiring path, the first wiring An input signal from the system is inputted to a path to constantly monitor a system abnormality and to monitor the presence or absence of an abnormality in the first wiring path and the second wiring path ,
When the test signal is not input to any of the first wiring path and the second wiring path, an input signal from the system is input to any of the first wiring path and the second wiring path. And a test system for a protection relay device, which monitors an abnormality of the system based on a logical product of outputs of the first wiring path and the second wiring path . The test signal from the test signal generation circuit and the input signal from the system are alternately input to the first wiring path, and the test signal from the test signal generation circuit is input to the second wiring path. The test system according to claim 1, wherein a signal and an input signal from the system are alternately input to monitor the presence or absence of an abnormality in the first wiring path and the second wiring path.   When any one of the first wiring path and the second wiring path breaks down, an input signal from the system is input to the other wiring path to continuously monitor a system abnormality. The operation test system of the protection relay device according to claim 1 or 2.

Images