JP5727239B2 - Circuit breaker test apparatus, program, and circuit breaker test method - Google Patents

Description

  The present invention relates to a circuit breaker test apparatus, a program, and a circuit breaker test method.

When inspecting the circuit breaker housed in the switchgear housing, an open / close characteristic test of the circuit breaker is performed.
In the circuit breaker switching characteristics test, for example, the device measurement test lead wire disclosed in Patent Document 1 is used to extend the connection cable connecting the circuit breaker and the DC bus of the switchgear, and switch the circuit breaker. This is done by pulling it out of the gear housing. Further, for example, the circuit breaker is pulled out from the switchgear housing and then connected to a dedicated test apparatus using a dedicated power source (working power source) provided for testing.
On the other hand, the quality of the circuit breaker operation time (on / off operation time and turn-off operation time) measured by the switching characteristic test is determined, for example, by collating with the measurement result at the time of shipment of the circuit breaker. Further, for example, the determination is made by comparing with a pass / fail range of the measurement result managed by the manufacturer of the circuit breaker.
In this way, the switchgear test can be performed and the switchgear circuit breaker can be checked.

JP 2006-3000529 A

  However, when performing the circuit breaker switching characteristics test by extending the connection cable, the impedance of the extension cable is connected in series to the circuit breaker control circuit, so the circuit breaker is housed in the switchgear. Test under different conditions. Also, when conducting switching characteristics tests using a dedicated power supply and test equipment, impedance differs from when the circuit breaker is connected to the DC bus, so testing under conditions different from actual operating conditions Become.

  On the other hand, when determining whether the operating time is good or not based on the measurement results at the time of shipment from the factory or the measurement results managed by the manufacturer, since these are measurement results at the rated voltage, there is an impedance from the DC power supply to the switchgear. In many cases, the open / close characteristics differ from the actual operating state. For this reason, although it is possible to determine the quality of the outline by comparing the measurement results, it is not possible to grasp the signs of the characteristic change at the initial stage of the failure in a timely manner.

  By the way, since the direct-current power supply supplies power to various loads other than the switchgear, the control voltage changes depending on the size of the load and the operating condition of the load, and the switching characteristics of the circuit breaker also change. Further, the control voltage changes depending on the state of charge of the storage battery of the DC power supply device, and the switching characteristics change.

  Therefore, it is necessary to obtain in advance the fluctuation of the control voltage due to the impedance from the DC power supply device to the switchgear, the state of the load, the state of charge of the storage battery, etc., and correct the operating time of the circuit breaker. Furthermore, for example, as shown in FIG. 7 and FIG. 8, the relationship between the control voltage of the circuit breaker and the operation time is different for each circuit breaker, such as the manufacturer and model, so a common correction value cannot be used. Different corrections are required for each circuit breaker to be inspected.

  The main present invention for solving the above-mentioned problems is a voltage measuring unit for measuring a voltage of a bus for supplying a control voltage to a circuit breaker housed in a switchgear housing, and a voltage measured by the voltage measuring unit is recorded. A voltage recording unit; a voltage control unit that outputs a voltage control signal according to the voltage recorded in the voltage recording unit; a DC power source that supplies a DC voltage according to the voltage control signal; and opening and closing the circuit breaker A voltage at which the voltage measuring unit measures the voltage of the bus, the switching control unit controlling, and an operation time measuring unit that measures the operation time of the circuit breaker when the switching control is performed by the switching control unit In the measuring step, the voltage recording unit records the voltage of the bus as an operating voltage while the control voltage is supplied from the bus and the circuit breaker is operating, and the operating time measuring unit records the operating time. Total In the testing step, the DC power supply supplies the DC voltage corresponding to the operating voltage recorded in advance in the voltage recording unit, and the switching control unit uses the DC voltage as a control voltage for the circuit breaker. A circuit breaker test apparatus, characterized in that the circuit breaker is supplied to

  Other features of the present invention will become apparent from the accompanying drawings and the description of this specification.

  According to the present invention, the switching characteristic test can be performed under the same conditions as the actual operation state without correcting the operation time for each circuit breaker.

It is a block diagram which shows the connection state in the structure of the circuit breaker testing apparatus in one Embodiment of this invention, and a voltage measurement process. It is a block diagram which shows the structure of the circuit breaker testing apparatus in one Embodiment of this invention, and the connection state in a test process. It is a flowchart explaining the method to measure the constant voltage V0, the on-operation voltage Vc, and the cut-off operation voltage Vt in a voltage measurement process. It is a flowchart explaining the method of measuring on-operation time Tc and cutting | disconnection operation time Tt in a test process. It is a flowchart explaining the method of measuring on-operation time Tc and cutting operation time Tt continuously in a test process. It is a block diagram which shows the structure of the circuit breaker test apparatus at the time of using MPU. It is a figure which shows the relationship between the control voltage for every circuit breaker, and an input operation time. It is a figure which shows the relationship between the control voltage for every circuit breaker, and cutting-off operation time.

  At least the following matters will become apparent from the description of this specification and the accompanying drawings.

=== Configuration of Circuit Breaker Test Device ===
Hereinafter, with reference to FIG. 1 and FIG. 2, the structure of the circuit breaker test apparatus in one Embodiment of this invention is demonstrated.

  The circuit breaker test apparatus 1 shown in FIGS. 1 and 2 is an apparatus for performing an open / close characteristic test of the circuit breakers 21 (21a, 21b) housed in the casing of the switchgear 2. FIG. 2 shows a connection state in a voltage measurement process and a test process, which will be described later. The circuit breaker test apparatus 1 includes terminals 91 to 98, and includes a voltage measurement unit 11, a voltage recording unit 12, a voltage control unit 13, a DC power source 14, a switching control unit 15, a current sensor 16, an operating time measurement unit 17, And a display unit 18. In the following description, the circuit breaker 21a is the test object.

  The DC bus 20 (20p, 20n) of the switch gear 2 is connected to the DC power supply device 3 via the control cable 4. In the voltage measurement step (FIG. 1), the circuit breakers 21 a and 21 b are housed in the casing of the switch gear 2, and the power supply voltage and the control voltage are supplied from the DC bus 20. On the other hand, in the test process (FIG. 2), the circuit breaker 21 a to be tested is pulled out from the casing of the switch gear 2, and the power supply voltage and the control voltage are supplied from the circuit breaker testing device 1. In FIGS. 1 and 2, 20 p and 20 n indicate the positive electrode side and the negative electrode side of the DC bus 20, respectively, and Rc indicates the impedance of the control cable 4.

  The input terminal for measurement of the voltage measuring unit 11 is connected to terminals 91 and 92. In addition, the voltage measurement unit 11 receives a selection signal SLm. The constant voltage V0, on-operation voltage Vc, and off-operation voltage Vt output from the voltage measurement unit 11 are input to the voltage recording unit 12 and recorded. The terminals 91 and 92 are connected to the DC buses 20p and 20n in the voltage measurement process, respectively, but may not be connected in the test process.

  The voltage control unit 13 appropriately reads the constant voltage V0, the on operation voltage Vc, or the off operation voltage Vt recorded in the voltage recording unit 12. In addition, a selection signal SLt is input to the voltage control unit 13. A voltage control signal CV is output from the voltage control unit 13.

  The input terminal of the DC power supply 14 is connected to terminals 93 and 94, and the output terminal is connected to terminals 95 and 96. Further, a voltage control signal CV is input to the DC power supply 14. The terminals 93 and 94 are connected to the DC buses 20p and 20n in the test process, respectively, but may not be connected in the voltage measurement process. Further, instead of DC buses 20p and 20n, they may be connected to another power source. On the other hand, the terminals 95 and 96 are connected to the power supply voltage supply terminals P and N of the circuit breaker 21a, respectively, in the test process.

  The open / close control unit 15 is supplied with the output voltage of the DC power supply 14. The selection signal SLt is input to the open / close control unit 15. The output end of the open / close control unit 15 is connected to terminals 97 and 98. The terminals 97 and 98 are respectively connected to the control voltage supply terminals C and T of the circuit breaker 21a in the test process.

  The current sensor 16 outputs a control current Ic supplied from the switching control unit 15 to the circuit breaker 21a. In addition, the control current Ic and the selection signal SLt are input to the operation time measurement unit 17. The on / off operation time Tc and the turn-off operation time Tt output from the operation time measuring unit 17 are input to the display unit 18.

=== Operation of Circuit Breaker Test Device ===
Hereinafter, the operation of the circuit breaker test apparatus according to the present embodiment will be described with reference to FIGS. 3 to 5 as appropriate.

  The selection signals SLm and SLt can be input from a changeover switch (not shown) provided in the circuit breaker test apparatus 1, a display unit 18 configured as a touch panel provided with an input unit, or the like. The selection signal SLm is a signal for selecting a voltage to be measured in the voltage measurement process, and SLm = 1 when measuring the on-operation voltage Vc, and SLm = when measuring the off-operation voltage Vt. 2. On the other hand, the selection signal SLt is a signal for selecting the operation time to be measured in the test process, and SLt = 1 is set when the on-operation time Tc is measured, and SLt = when the cut-off operation time Tt is measured. 2 and SLt = 3 when both are measured continuously. Further, SLt = 0 is set in the voltage measurement process, and SLm = 0 is set in the test process.

  First, referring to FIG. 3, the circuit breaker testing apparatus 1 is connected to the switchgear 2 as shown in FIG. 1, and SLt = 0, and the voltage measuring unit 11 detects the voltage of the DC bus 20 (between the DC buses 20p and 20n). The operation in the voltage measurement process for measuring (voltage) will be described. In the following, the case where the input operation voltage Vc is measured with SLm = 1 will be described.

  When SLm = 1 and the voltage measurement process is started, the breaker testing apparatus 1 first stops the output of the DC power supply 14 or stops the output of the DC power supply 14 in order to suppress the load on the DC bus 20. Is confirmed (S11). For example, when the output of the DC power supply 14 is stopped, the output voltage of the DC power supply 14 is set to 0 V by setting CV = 0 when SLt = 0. Further, when confirming the stop of the output of the DC power supply 14, the terminals 93 and 94 are not connected to the DC buses 20p and 20n, respectively, and the output voltage of the DC power supply 14 is directly confirmed.

  Next, the voltage measurement unit 11 always measures the voltage of the DC bus 20 while the circuit breakers 21a and 21b are not operating as the voltage V0, and temporarily stores it in a memory (not shown) provided in the voltage measurement unit 11. (S12). In this state, the operator performs an input operation to close the circuit breaker 21a to be tested (S13).

  Next, the voltage measuring unit 11 measures the voltage of the DC bus 20 as the input operating voltage Vc while the control voltage is supplied from the DC bus 20 and the circuit breaker 21a is closing, and the voltage is constantly applied. Similar to V0, it is temporarily stored in the memory (S14). The measurement of the input operation voltage Vc is continued until a predetermined time (for example, 500 ms) elapses (S16: NO). In the present embodiment, if the voltage of the DC bus 20 does not change even after the input operation (S15: NO), the operator stops the measurement (S18: YES) and ends the voltage measurement process. It is good (S19).

  Next, when a predetermined time elapses (S16: YES), the voltage recording unit 12 records the constant voltage V0 and the input operation voltage Vc stored in the memory (S17), and ends the voltage measurement process (S19). . Here, the constant voltage V0 is an instantaneous voltage or an average voltage while the circuit breakers 21a and 21b are not operating, and is recorded as one data. On the other hand, the on-operation voltage Vc is recorded as time-series data of voltage during the on-operation of the circuit breaker 21a. In order to save the capacity of the memory and the voltage recording unit 12, the change in the voltage of the DC bus 20 is approximated to a step-like change, and only the elapsed time up to the change point and the voltage after the change are applied to the input operation voltage Vc. May be stored and recorded as

  In this way, the voltage V0 and the incoming operation voltage Vc are previously recorded in the voltage recording unit 12 in the voltage measurement step. Similarly, by performing the voltage measurement process with SLm = 2, the voltage of the DC bus 20 is cut off while the control voltage is supplied from the DC bus 20 and the circuit breaker 21a is opened. It can be measured as voltage Vt and recorded with voltage V0 at all times.

  The voltage measuring unit 11 measures the voltage of the DC bus 20 so that the voltage obtained by subtracting the voltage drop due to the impedance Rc of the control cable 4 from the output voltage of the DC power supply device 3 is always the voltage V0 and the input operating voltage. It outputs as Vc and the cut-off operation voltage Vt. Moreover, it is desirable that the voltage measuring unit 11 has a sufficiently high input impedance so as not to become a load on the DC bus 20.

  Next, referring to FIG. 4, the circuit breaker test apparatus 1 is connected to the switchgear 2 and the circuit breaker 21a to be tested as shown in FIG. 2, and SLm = 0, and the operation time measuring unit 17 is connected to the circuit breaker 21a. The operation in the test process for measuring the operation time will be described. In the following, the case where the input operation time Tc is measured with SLt = 1 will be described. In the test process (FIG. 2), the impedance of the lead wire connecting the terminals 95 to 98 and each terminal (P, N, C, T) of the circuit breaker 21a is the DC bus in the voltage measurement process (FIG. 1). 20 and the impedance between each terminal of the circuit breaker 21a.

  When SLt = 1 and the test process is started (S21), the voltage control unit 13 first reads the data of the constant voltage V0 recorded in the voltage measurement process from the voltage recording unit 12, and determines the voltage according to the data. The control signal CV is output and the voltage V0 is always output from the DC power supply 14 (S22). Here, the DC power supply 14 has an input terminal connected to the DC bus 20 via terminals 93 and 94, and supplies a DC voltage obtained by appropriately transforming the voltage of the DC bus 20 according to the voltage control signal CV.

  Next, the opening / closing control unit 15 outputs an input operation command from the output C and inputs it to the terminal C of the circuit breaker 21a (S23). Here, the open / close control unit 15 is supplied with the output voltage of the DC power source 14, that is, the constant voltage V0. The constant voltage V0 is supplied as a control voltage to the terminal C of the circuit breaker 21a. Start the input operation. When the circuit breaker 21a starts the on-operation, the switching control unit 15 supplies the control current Ic to the circuit breaker 21a, and the control current Ic is measured by the current sensor 16 such as a current transformer for measuring and operating time Input to the measurement unit 17.

  Next, the voltage control unit 13 reads the time series data of the input operation voltage Vc recorded in the voltage measurement process from the voltage recording unit 12, outputs a voltage control signal CV according to the data, and inputs from the DC power supply 14. The operating voltage Vc is output (S24). In the voltage measurement step, when the change in the voltage of the DC bus 20 is approximated to a step-like change, the output voltage of the DC power source 14 is changed after the elapsed time until the recorded change point has elapsed. Change to the recorded post-change voltage. Further, the operation time measuring unit 17 outputs an input operation command from the switching control unit 15, and measures an elapsed time after the circuit breaker 21a starts the input operation (S25). Until the control current Ic becomes substantially 0 (S26: NO), the voltage control unit 13 continues to control the output voltage of the DC power supply 14, and the operation time measurement unit 17 continues to count the elapsed time.

  Next, when the control current Ic becomes substantially 0 (S26: YES), the voltage control unit 13 outputs the voltage V0 from the DC power supply 14 again (S27). Further, the operation time measuring unit 17 outputs the elapsed time until the control current Ic becomes substantially zero as the input operation time Tc. And the display part 18 displays on-operation time Tc as a measurement result (S28), and complete | finishes a test process (S29).

  In this way, the input operation time Tc can be measured in the test process. Similarly, by performing the test process with SLt = 2, it is possible to measure the operating time of the circuit breaker 21a when the control voltage is supplied from the switching control unit 15 to perform the switching operation as the switching operation time Tt. . A recording unit may be provided instead of the display unit 18 or together with the display unit 18 to record the on / off operation time Tc and the turn-off operation time Tt as measurement results.

  Further, in the testing process, the switching control of the circuit breaker 21a is not performed by the operator, but is performed by the switching control unit 15. Therefore, as shown in FIG. Tt can also be measured continuously. In the incoming operation test step S32 of FIG. 5, the same processing as S22 to S27 of FIG. 4 in the case where the test step is performed with SLt = 1 is performed. On the other hand, in the cutting operation test step S33, processing similar to S23 to S27 in FIG. 4 in the case where the test step is performed with SLt = 2 is performed. Then, the display unit 18 displays the on-operation time Tc and the off-operation time Tt measured in the on-operation test step S32 and the off-operation test step S33, respectively (S34), and ends the test step (S35).

  Further, a mode for obtaining a measurement result at the rated voltage may be provided in the test process, similarly to the measurement result at the time of factory shipment. For example, when SLt = 4 to 6, a voltage equal to the rated control voltage of the circuit breaker 21a is output from the DC power supply 14, and the output voltage is supplied as a control voltage to the circuit breaker 21a to perform the test process. The quality can be judged by comparing with the measurement result at the time of factory shipment. In this case, SLt = 4 when measuring the on-operation time Tc, SLt = 5 when measuring the cutting operation time Tt, and SLt = 6 when measuring both continuously.

=== Other configuration examples of the circuit breaker test apparatus ===
Among the circuit breaker test apparatus 1, functions of the voltage control unit 13, a part of the switching control unit 15, and a part of the operation time measurement unit 17 can be realized by a computer. FIG. 6 shows the configuration of a circuit breaker testing apparatus when an MPU (Micro Processing Unit) 19 is used as the computer.

  The circuit breaker test apparatus 1 shown in FIG. 6 is the same as the circuit breaker test apparatus 1 shown in FIGS. 1 and 2 except for the MPU 19. The voltage measurement unit 11, the voltage recording unit 12, the DC power supply 14, the current The sensor 16 and the display unit 18 are included, and switches 151 and 152 and a clock unit 171 are further included.

  Similar to the voltage control unit 13, the MPU 19 outputs a voltage control signal CV according to the voltage recorded in the voltage recording unit 12. Further, the MPU 19 outputs the switching control signals Sc and St and controls the switches 151 and 152, respectively, thereby supplying the control voltage and controlling the switching of the circuit breaker to be tested in the same manner as the switching control unit 15. can do. Further, the MPU 19 uses the current time Tp output from the clock unit 171 to measure the time difference between the current times at the start and end of the on / off operation of the circuit breaker to be tested as the operation time of the circuit breaker. can do.

  As described above, in the voltage measurement step, the voltage of the DC bus 20 while the control voltage is supplied from the DC bus 20 and the circuit breaker 21a is operating is previously measured and recorded as the operating voltage (Vc, Vt). In the test process, the operation time (Tc, Tt) is corrected for each circuit breaker by supplying a voltage equivalent to the operation voltage recorded in the voltage measurement process to the circuit breaker 21a as a control voltage and measuring the operation time (Tc, Tt). It is possible to perform an open / close characteristic test under the same conditions as the actual operation state without performing the above.

  In addition, by supplying a voltage equal to the rated control voltage of the circuit breaker 21a to the circuit breaker 21a as a control voltage and performing the test process, it is possible to determine whether the circuit is good or bad compared with the measurement result at the time of factory shipment.

  Further, by measuring the control current Ic supplied from the switching control unit 15 to the circuit breaker 21a, the process from when the switching control unit 15 starts the switching control of the circuit breaker 21a until the control current Ic becomes substantially zero. Time can be measured as operating time.

  Further, in the test process, by connecting the input terminal of the DC power supply 14 to the DC bus 20, a DC voltage obtained by appropriately transforming the voltage of the DC bus 20 according to the voltage control signal CV can be supplied from the DC power supply 14. .

  In addition, the impedance of the lead wire connecting the terminals 95 to 98 and each terminal of the circuit breaker 21a in the test process should be substantially equal to the impedance between the DC bus 20 and each terminal of the circuit breaker 21a in the voltage measurement process. Thus, in the test process, a control voltage equivalent to the voltage measurement process can be supplied to the circuit breaker 21a.

  Further, in a program for causing the MPU 19 to realize functions corresponding to a part of the voltage control unit 13, part of the switching control unit 15, and part of the operation time measurement unit 17 of the circuit breaker test apparatus 1, The voltage control signal CV is output according to the recorded voltage, the switching control signals (Sc, St) are output to control the circuit breaker to be tested, and the current time at the start and end of the switching control. By measuring the time difference as the operation time of the circuit breaker, the test process can be performed using the MPU 19.

  Further, the voltage of the DC bus 20 while the control voltage is supplied from the DC bus 20 and the circuit breaker 21a is operating is previously measured and recorded as the operating voltage, and a voltage equivalent to the pre-recorded operating voltage is recorded. By supplying the control voltage to the circuit breaker 21a and measuring the operation time, the switching characteristic test can be performed under the same conditions as the actual operation state without correcting the operation time for each circuit breaker.

  In addition, the said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Circuit breaker test apparatus 2 Switch gear 3 DC power supply 4 Control cable 11 Voltage measurement part 12 Voltage recording part 13 Voltage control part 14 DC power supply 15 Opening / closing control part 16 Current sensor 17 Operating time measurement part 18 Display part 19 MPU
20 (20p, 20n) DC bus 21 (21a, 21b) Circuit breaker 91-98 Terminal 151, 152 Switch 171 Clock unit

Claims (7)

A voltage measuring unit for measuring a voltage of a bus for supplying a control voltage to a circuit breaker housed in a switchgear housing;
A voltage recording unit for recording the voltage measured by the voltage measuring unit;
A voltage control unit that outputs a voltage control signal according to the voltage recorded in the voltage recording unit;
A DC power supply for supplying a DC voltage according to the voltage control signal;
An opening / closing control unit for controlling opening / closing of the circuit breaker;
An operation time measuring unit that measures an operation time of the circuit breaker when the opening / closing control is performed by the opening / closing control unit;
Have
In the voltage measuring step in which the voltage measuring unit measures the voltage of the bus,
The voltage recording unit records a voltage of the bus as an operating voltage while a control voltage is supplied from the bus and the circuit breaker is operating.
In the test process in which the operating time measuring unit measures the operating time,
The DC power supply supplies the DC voltage corresponding to the operating voltage recorded in advance in the voltage recording unit,
The circuit breaker testing apparatus, wherein the switching control unit supplies the DC voltage as a control voltage to the circuit breaker. In the test process,
The DC power supply supplies the DC voltage corresponding to the operating voltage pre-recorded in the voltage recording unit or the DC voltage equal to the rated control voltage of the circuit breaker according to the voltage control signal. The circuit breaker testing apparatus according to claim 1. In the test process,
The operation time measuring unit is defined as a time from when the switching control unit starts switching control of the circuit breaker until a control current supplied from the switching control unit to the circuit breaker becomes zero. The circuit breaker testing device according to claim 1 or 2, wherein the circuit breaker testing device is measured. In the voltage measurement step,
The voltage measuring unit is connected to the bus;
In the test process,
4. The DC power supply according to claim 1, wherein the DC power supply is connected to the busbar, and transforms the voltage of the busbar according to the voltage control signal to supply the DC voltage. 5. Circuit breaker testing device. The circuit breaker is housed in the switchgear case in the voltage measurement step, and is pulled out of the switchgear case in the test step,
The impedance of a lead wire for supplying a control voltage from the switching control unit to the circuit breaker in the test step is substantially equal to an impedance between the bus bar and the circuit breaker in the voltage measurement step. 4. The circuit breaker testing device according to 4. A voltage measuring unit for measuring a voltage of a bus for supplying a control voltage to a circuit breaker housed in a switchgear housing;
A voltage recording unit for recording the voltage measured by the voltage measuring unit;
A DC power supply for supplying a DC voltage corresponding to the voltage control signal;
A switch for supplying the DC voltage to the circuit breaker as a control voltage in response to a switch control signal;
A clock section that outputs the current time;
On a computer with
In the voltage measurement process,
A function for causing the voltage measuring unit to measure the voltage of the bus;
A function of causing the voltage recording unit to record a voltage of the bus as an operating voltage while a control voltage is supplied from the bus and the circuit breaker is operating;
In the testing process,
A function of outputting the voltage control signal according to the operating voltage recorded in advance in the voltage recording unit;
A function of outputting the switching control signal to control the switching of the circuit breaker;
A function of measuring a time difference of the current time at the start and end of the switching control of the circuit breaker by the switching control signal as an operating time of the circuit breaker;
A program to realize A control voltage is supplied from a bus to a circuit breaker housed in a switchgear housing, and the voltage of the bus is measured and recorded in advance as an operating voltage while the circuit breaker is in operation.
Supplying a DC voltage corresponding to the operating voltage recorded in advance to the circuit breaker as a control voltage;
A circuit breaker test method, comprising: measuring an operation time of the circuit breaker when the DC voltage is supplied and the switching is controlled.

Images