Detection platform and detection method for high-voltage alternating current fuse breaking test

Abstract

This invention discloses a testing platform and method for testing the breaking capacity of high-voltage AC fuses. A first Rogowski coil LH1 is connected to the low-voltage circuit. The first Rogowski coil LH1 is connected in parallel with a digital stopwatch, then in series with a rectifier bridge circuit, and finally connected to a data acquisition unit. A second Rogowski coil LH2 is connected to the high-voltage circuit and is also connected to the data acquisition unit. During the test, the low-voltage circuit is first turned on, and the current-carrying time t1 of the low-voltage circuit is measured using the digital stopwatch. The data acquisition unit is set to trigger on the falling edge of the current, and the triggering time of the data acquisition unit is recorded as T. X When the low-voltage circuit is completely disconnected and the high-voltage circuit is energized, the data acquisition unit records the starting time of the high-voltage circuit current waveform as T. Y The switching time required to switch from the low-voltage circuit to the high-voltage circuit is t2=T. Y -T X This invention employs two Rogowski coils to collect current and utilizes a level-triggered mode to accurately acquire the switching time t2 required for the low-voltage circuit to switch to the high-voltage circuit in each test.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical appliance detection, in particular to a detection platform and method for high-voltage alternating current fuse breaking test. BACKGROUND

[0002] In the field of electrical appliance detection, the fuse needs to be tested according to the standard GB / T15166.2-2008 High-voltage alternating current fuses Part 2: Current limiting fuses, wherein the test mode 3 is stipulated in the clause 6.6.1.1 Test overview: for general fuses, I3 is the melting current for 1h or longer.

[0003] In the actual experiment process, the high-voltage loop part of the detection platform for breaking test generally cannot exceed 10 seconds, so the test needs to preheat the conversion system. The data acquisition time of the data acquisition device is generally within 3 minutes, and the data acquisition device cannot collect the current in the whole test process. The detection platform can only measure the low-voltage current passing time t1 when the low-voltage loop is connected by using the time relay or PLC, and the high-voltage current passing time t3 when the high-voltage loop is connected by using the data acquisition device. The switching time t2 required for switching the low-voltage loop to the high-voltage loop is required to be not more than 0.2s according to the clause 6.6.3.1 of the standard GB / T15166.2-2008, but the switching time t2 cannot be accurately measured in each test at present, so it is impossible to judge whether the breaking test meets the requirements of the standard. SUMMARY

[0004] The present application aims to provide a detection platform and method for high-voltage alternating current fuse breaking test to solve the problems in the prior art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows:

[0006] A detection platform for high-voltage alternating current fuse breaking test, comprising a high-voltage loop and a low-voltage loop, the high-voltage loop comprising a high-voltage alternating current power supply and an operating circuit breaker G1 connected to the high-voltage alternating current power supply, the low-voltage loop comprising a high-voltage circuit breaker G2, a low-voltage circuit breaker D1 and a low-voltage alternating current power supply connected in series with each other, a first Rogowski coil LH1 connected to the low-voltage loop, the secondary connection ends LH1+ and LH1- of the first Rogowski coil LH1 connected in parallel to a digital electric chronograph and in series to a rectifier bridge circuit and then connected to a data acquisition device 1 channel, a second Rogowski coil LH2 connected to the high-voltage loop, the secondary connection ends LH2+ and LH2- of the second Rogowski coil LH2 connected to a data acquisition device 2 channel, and a test sample SP connected to the high-voltage loop and the low-voltage loop.

[0007] Preferably, a filter capacitor C1 is connected between the rectifier bridge circuit and the channel 1 of the data acquisition device.

[0008] A detection method for a detection platform for high-voltage alternating current fuse breaking test, which adopts the implementation of the detection platform for high-voltage alternating current fuse breaking test described above, and the implementation method comprises the following steps:

[0009] Step one, build a high-voltage loop and a low-voltage loop, adjust the voltage, current and power factor of the high-voltage loop, and adjust the current of the low-voltage loop to meet the requirements of the high-voltage alternating current fuse breaking test;

[0010] Step two, set the test timing control process: open the operating circuit breaker G1, close the low-voltage circuit breaker D1 at time Ta, and close the high-voltage circuit breaker G2 at time Tb, at this time the high-voltage loop is in an open state and the low-voltage loop is in a current passing state; when the test sample SP meets the conditions for the low-voltage loop to switch to the high-voltage loop, open the high-voltage circuit breaker G2 and the low-voltage circuit breaker D1 at time Tc, at this time the high-voltage loop and the low-voltage loop are both in an open state; close the operating circuit breaker G1 at time Td, at this time the low-voltage loop is in an open state and the high-voltage loop is in a current passing state; open the operating circuit breaker G1 at time Te, at this time the high-voltage loop and the low-voltage loop are both in an open state; the switching time t2 required for the low-voltage loop to switch to the high-voltage loop is theoretically:

[0011] T2=Td-Tc

[0012] Step three, measurement of the switching time t2 required for the low-voltage loop to switch to the high-voltage loop: connect a digital electric chronograph to the secondary connection terminals LH1+ and LH1- of the first Rogowski coil LH1, and at the same time connect a rectifier bridge circuit and a filter capacitor C1 to the secondary connection terminals LH1+ and LH1- of the first Rogowski coil LH1, when the low-voltage loop is in a current passing state, the digital electric chronograph starts timing, when the low-voltage loop is in an open state without current, the digital electric chronograph stops timing, the current passing time t1 of the low-voltage loop is measured, and the rectifier bridge circuit and the filter capacitor C1 rectify the current output from the secondary connection terminals LH1+ and LH1- of the first Rogowski coil LH1 into direct current; when the first Rogowski coil LH1 is powered off, the positive connection terminal 1+ and the negative connection terminal 1- of channel 1 of the data collector 1 show a current falling edge, the current falling edge trigger of the data collector is set, the data collector is turned on, and the trigger time T X of the data collector is recorded; after the high-voltage loop is in a current passing state, the secondary connection terminals LH2+ and LH2- of the second Rogowski coil LH2 are connected to channel 2 of the data collector 2, the data collector collects the melting current I3 of the high-voltage loop, and after the low-voltage loop is completely opened and the high-voltage loop is in a current passing state, the current waveform of the high-voltage loop is displayed on the data collector, the starting time T Y of the current waveform of the high-voltage loop is recorded, and the switching time t2 required for the low-voltage loop to switch to the high-voltage loop is T Y -T XThe high-voltage loop through time t3 is directly read on the data collector.

[0013] Preferably, the voltage measurement range of the current collected by the first Rogowski coil LH1 is 0-3kA, and the voltage measurement range of the current collected by the second Rogowski coil LH2 is 0-10kA.

[0014] Preferably, the sampling frequency of the data collector is 500kHz, the input signal is 0-200V DC / AC, and the measurement time range is 0.001ms-100s.

[0015] Preferably, the contact of the digital electric stopwatch allows the potential and potential input to be 0.5-250V DC / AC, the working power voltage is 220v±10% 50Hz, and the measurement range is 0000.001s-9999.999s.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] The present application adopts two Rogowski coils to collect current, and uses a level trigger mode, so that the switching time t2 required for switching from a low-voltage loop to a high-voltage loop can be accurately collected each time.

[0018] The measurement method described in the present application is simple and effective, and has strong anti-interference ability. DETAILED DESCRIPTION

[0019] Figure 1 is a circuit principle diagram of a high-voltage loop and a low-voltage loop of a detection platform for high-voltage alternating current fuse breaking test;

[0020] Figure 2 is a circuit principle diagram of a detection platform, a digital electric stopwatch and a data collector for high-voltage alternating current fuse breaking test;

[0021] Figure 3 is a time node diagram of a detection method of a detection platform for high-voltage alternating current fuse breaking test. DETAILED DESCRIPTION

[0022] The present application will be further described in detail below in combination with the drawings. It is suggested that the test process can be illustrated by examples.

[0023] As Figure 1 , Figure 2The detection platform for high-voltage alternating current fuse breaking test shown in the figure includes a high-voltage loop and a low-voltage loop, the high-voltage loop includes a high-voltage alternating current power supply and an operating circuit breaker G1 connected with the high-voltage alternating current power supply, the low-voltage loop includes a high-voltage circuit breaker G2, a low-voltage circuit breaker D1 and a low-voltage alternating current power supply connected in series with each other, a first Rogowski coil LH1 is connected to the low-voltage loop, the secondary connection terminals LH1+ and LH1- of the first Rogowski coil LH1 are connected in parallel with a digital electric chronograph and in series with a rectifier bridge circuit and then connected to a channel of a data collector 1, a second Rogowski coil LH2 is connected to the high-voltage loop, the secondary connection terminals LH2+ and LH2- of the second Rogowski coil LH2 are connected to a channel of a data collector 2, and a test sample SP is connected to the high-voltage loop and the low-voltage loop.

[0024] A filter capacitor C1 is connected between the rectifier bridge circuit and the channel 1 of the data collector.

[0025] The detection method of the detection platform for high-voltage alternating current fuse breaking test adopts the detection platform for high-voltage alternating current fuse breaking test described above, and includes the following steps:

[0026] Step one, building a high-voltage loop and a low-voltage loop, adjusting the voltage, current and power factor of the high-voltage loop, and adjusting the current of the low-voltage loop to meet the requirements of high-voltage alternating current fuse breaking test;

[0027] Step two, setting a test timing control process: disconnecting the operating circuit breaker G1, closing the low-voltage circuit breaker D1 at Ta=0.101s, closing the high-voltage circuit breaker G2 at Tb=1.004s, at this time, the high-voltage loop is in a disconnected state and the low-voltage loop is in a current passing state; when the test sample SP meets the condition of switching the low-voltage loop to the high-voltage loop, disconnecting the high-voltage circuit breaker G2 and the low-voltage circuit breaker D1 at Tc=3752s, at this time, the high-voltage loop and the low-voltage loop are both in a disconnected state; closing the operating circuit breaker G1 at Td=3752.1s, at this time, the low-voltage loop is in a disconnected state and the high-voltage loop is in a current passing state; disconnecting the operating circuit breaker G1 at Te=3754.3s, at this time, the high-voltage loop and the low-voltage loop are both in a disconnected state; the switching time t2 required for switching the low-voltage loop to the high-voltage loop is theoretically:

[0028] T2=Td-Tc=0.1s

[0029] Ta, Tb, Tc, Td and Te can only represent the sequence and closing and opening time of the corresponding switches in the test process, and cannot be used as the time of the actual current passing time to calculate the current passing time;

[0030] Step three, the measurement of the switching time t2 required for the low voltage circuit to switch to the high voltage circuit: connect a digital electric chronograph to the secondary connection terminals LH1+ and LH1- of the first Rogowski coil LH1, and at the same time connect a rectifier bridge circuit and a filter capacitor C1 to the secondary connection terminals LH1+ and LH1- of the first Rogowski coil LH1, start the digital electric chronograph when the low voltage circuit is in conduction, stop the digital electric chronograph when the low voltage circuit is disconnected and has no current, measure the low voltage circuit conduction time t1, and rectify the current output from the secondary connection terminals LH1+ and LH1- of the first Rogowski coil LH1 into direct current by the rectifier bridge circuit and the filter capacitor C1; when the first Rogowski coil LH1 is disconnected, the positive connection terminal 1+ and the negative connection terminal 1- of the channel of the data collector 1 present a current falling edge, the current falling edge trigger of the data collector is set, the data collector is turned on, and the trigger time of the data collector is recorded as T X =300ms; after the high voltage circuit is in conduction, the secondary connection terminals LH2+ and LH2- of the second Rogowski coil LH2 are connected to the channel of the data collector 2, the data collector collects the melting current I3 of the high voltage circuit, and after the low voltage circuit is completely disconnected and the high voltage circuit is in conduction, the current waveform of the high voltage circuit is displayed on the data collector, and the starting time of the current waveform of the high voltage circuit is recorded as T Y =417ms, then the switching time t2 required for the low voltage circuit to switch to the high voltage circuit is T Y -T X =117ms; the high voltage circuit conduction time t3 is directly read on the data collector.

[0031] The voltage measurement range of the current collected by the first Rogowski coil LH1 is 0-3kA; and the voltage measurement range of the current collected by the second Rogowski coil LH2 is 0-10kA.

[0032] The sampling frequency of the data collector is 500kHz, the input signal is 0-200V DC / AC, and the measurement time range is 0.001ms-100s.

[0033] The contact of the digital electric chronograph allows potential and potential input of 0.5-250V DC / AC, the working power voltage is 220v±10% 50Hz, and the measurement range is 0000.001s-9999.999s.

[0034] The application adopts two Rogowski coils to collect current, and uses a level trigger mode, so that the switching time t2 required for the low voltage circuit to switch to the high voltage circuit can be accurately collected each time.

[0035] The above is only a preferred example of the application. It should be noted that for ordinary skilled persons in the art, other equivalent modifications and improvements can also be made under the technical inspiration provided by the application, and should also be considered as the protection scope of the application.

Claims

1. A detection platform for high-voltage alternating current fuse breaking test, comprising a high-voltage loop and a low-voltage loop, the high-voltage loop comprising a high-voltage alternating current power supply and an operating circuit breaker G1 connected to the high-voltage alternating current power supply, the low-voltage loop comprising a high-voltage circuit breaker G2, a low-voltage circuit breaker D1 and a low-voltage alternating current power supply connected in series with each other, characterized in that: The low-voltage circuit is connected with a first Rogowski coil LH1, the secondary terminals LH1+ and LH1- of the first Rogowski coil LH1 are connected in parallel with the digital electric chronograph and in series with the rectifier bridge circuit and then connected to the channel 1 of the data collector 1; the high-voltage circuit is connected with a second Rogowski coil LH2, the secondary terminals LH2+ and LH2- of the second Rogowski coil LH2 are connected with the channel 2 of the data collector 2; the test sample SP is connected to the high-voltage circuit and the low-voltage circuit.

2. The test platform for high voltage AC fuse breaking test according to claim 1, characterized in that: The rectifier bridge circuit is connected with the channel 1 of the data collector with a filter capacitor C1.

3. A detection method for a detection platform for high-voltage alternating current fuse breaking tests, which detection method employs the implementation of the detection platform for high-voltage alternating current fuse breaking tests as claimed in claim 1 or 2, characterized in that: The method comprises the following steps: Step one, building the high-voltage circuit and the low-voltage circuit, adjusting the voltage, current and power factor of the high-voltage circuit and adjusting the current of the low-voltage circuit to meet the requirements of the high-voltage AC fuse breaking test; Step two, setting the test timing control process: opening the operating circuit breaker G1, closing the low-voltage circuit breaker D1 at time Ta, closing the high-voltage circuit breaker G2 at time Tb, at this time, the high-voltage circuit is in an open state and the low-voltage circuit is in a current passing state; when the test sample SP meets the conditions for the low-voltage circuit to switch to the high-voltage circuit, opening the high-voltage circuit breaker G2 and the low-voltage circuit breaker D1 at time Tc, at this time, the high-voltage circuit and the low-voltage circuit are both in an open state; closing the operating circuit breaker G1 at time Td, at this time, the low-voltage circuit is in an open state and the high-voltage circuit is in a current passing state; opening the operating circuit breaker G1 at time Te, at this time, the high-voltage circuit and the low-voltage circuit are both in an open state; the switching time t2 required for the low-voltage circuit to switch to the high-voltage circuit is theoretically: T2=Td-Tc Step three, the measurement of the switching time t2 required for the low voltage circuit switching to the high voltage circuit: connect the digital electric chronograph to the secondary connection terminals LH1+ and LH1- of the first Rogowski coil LH1, and at the same time connect the rectifier bridge circuit and the filter capacitor C1 to the secondary connection terminals LH1+ and LH1- of the first Rogowski coil LH1, start the digital electric chronograph when the low voltage circuit is in conduction, stop the digital electric chronograph when the low voltage circuit is disconnected and there is no current, measure the low voltage circuit conduction time t1, and rectify the current output from the secondary connection terminals LH1+ and LH1- of the first Rogowski coil LH1 into direct current by the rectifier bridge circuit and the filter capacitor C1; when the first Rogowski coil LH1 is disconnected, the positive connection terminal 1+ and the negative connection terminal 1- of the channel of the data collector 1 show a current falling edge, set the current falling edge trigger of the data collector, start the data collector, and record the trigger time T X of the data collector; after the high voltage circuit is in conduction, connect the secondary connection terminals LH2+ and LH2- of the second Rogowski coil LH2 to the channel of the data collector 2, and the data collector collects the melting current I3 of the high voltage circuit; after the low voltage circuit is completely disconnected and the high voltage circuit is in conduction, the current waveform of the high voltage circuit is displayed on the data collector, and the starting time T Y of the current waveform of the high voltage circuit is recorded, then the switching time t2 required for the low voltage circuit switching to the high voltage circuit is t2=T Y -T X ; and the high voltage circuit conduction time t3 is directly read on the data collector.

4. The detection method of claim 3, wherein: The voltage measurement range of the current collected by the first Rogowski coil LH1 is 0-3kA; the voltage measurement range of the current collected by the second Rogowski coil LH2 is 0-10kA.

5. The detection method according to claim 3 or 4, characterized in that: The sampling frequency of the data collector is 500kHz, the input signal is 0-200V DC / AC, and the measurement time range is 0.001ms-100s.

6. The method of claim 5, wherein: The contacts of the digital electric chronograph allow the charged potential and potential input to be 0.5-250V DC / AC, the working power voltage is 220v±10% 50Hz, and the measurement range is 0000.001s-9999.999s.

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