DC component short circuit connection and disconnection test full circuit power factor test method

Abstract

The present invention belongs to the technical field of short-circuit connection and disconnection test, and in particular, relates to a full-circuit power factor test method for a DC component short-circuit connection and disconnection test. It is realized by using a full-circuit power factor test system for a DC component short-circuit connection and disconnection test, and the test system has the characteristics of simple structure and easy operation. The test system can realize the power factor test of the short-circuit connection and disconnection capacity test of a mine explosion-proof low-voltage AC feeder switch, which can effectively improve the test accuracy of parameters such as power factor and arcing time during the inspection process, improve the inspection efficiency and technological level of the mine explosion-proof low-voltage AC feeder switch, ensure the synchronization between the disconnection of the isolating switch and the test current, shorten the inspection cycle, save power resources, and improve the inspection level of the connection and disconnection capacity of mine explosion-proof electrical appliances, provide new ideas for the evaluation of the operating process status of mine explosion-proof electrical appliances, and promote the continuous and healthy development of the detection and inspection and mine explosion-proof electrical appliances.

Description

Technical Field

[0001] The invention belongs to the technical field of short-circuit connection and disconnection tests, and in particular relates to a full-circuit power factor test method for a direct current component short-circuit connection and disconnection test. Background Art

[0002] The power factor of AC circuit is one of the important electrical parameters in short-circuit making and breaking capacity tests, and has a direct impact on the breaking performance of AC electrical appliances.

[0003] The existing power factor test for short-circuit connection and breaking capacity test of AC electrical appliances adopts phase difference method, low voltage estimation method and DC component method. The first two methods have great disadvantages and cannot accurately test the power factor of the line during short-circuit connection and breaking capacity test of AC electrical appliances.

[0004] The phase angle difference method obtains the phase angle of voltage and current manually by drawing a graph, and has low test accuracy and large result deviation.

[0005] The low voltage inference method does not take into account the impedance of the power grid and transformer. There is a large deviation between the test results and the actual lines of the short-circuit connection and disconnection capacity test, and the test accuracy is low.

[0006] The DC component method tests the power factor of the entire circuit and is suitable for situations where the DC component of the test process is large. Generally, the power factor of the test circuit is low (not greater than 0.3).

[0007] The power factor of the short-circuit connection and disconnection capacity test of the mining explosion-proof low-voltage AC feeder switch is between 0.25 and 0.3, and it is suitable to use the DC component method to test the power factor of the test circuit.

[0008] With respect to the above-mentioned prior art, it is necessary for those skilled in the art to conduct research, development and improvement. Summary of the invention

[0009] In view of the shortcomings of the above-mentioned prior art, the present invention provides a full-circuit power factor test method for DC component short-circuit connection and disconnection test. Its purpose is to realize the power factor test of short-circuit connection and disconnection capacity test of mining explosion-proof low-voltage AC feeder switch, improve the power factor test accuracy, and enhance the inspection efficiency and scientific and technological level of mining explosion-proof low-voltage AC feeder switch.

[0010] The technical solution adopted by the present invention to achieve the above-mentioned purpose is:

[0011] The DC component short-circuit connection and disconnection test full-circuit power factor test method is realized by using the DC component short-circuit connection and disconnection test full-circuit power factor test system, wherein the test system is connected by a touch screen and a communication module, and one end of the communication module, the power module, the reset module, the clock module, and the crystal oscillator module are respectively connected to the PIC; the other end of the PIC is connected to the mine explosion-proof low-voltage AC feeder switch through an electromagnetic relay group; one end of the three-phase line voltage transformer and the three-phase phase voltage transformer are respectively connected to the mine explosion-proof low-voltage AC feeder switch, and the other end of the three-phase line voltage transformer and the three-phase phase voltage transformer are respectively connected to the signal processing module, and the other end of the signal processing module is connected to the PIC; one end of the three-phase current transformer is connected to the mine explosion-proof low-voltage AC feeder switch, and the other end of the three-phase current transformer is connected to the signal integral conversion module, and the other end of the signal integral conversion module is connected to the PIC.

[0012] Furthermore, the signal output end of the touch screen is connected to the signal input end of the communication module, and the signal output ends of the communication module, power module, reset module, clock module, and crystal oscillator module are respectively connected to the PIC communication signal terminal, power terminal, reset signal terminal, clock signal input terminal, and crystal oscillator signal input terminal.

[0013] Furthermore, the control signal output terminal of the PIC is connected to the control signal input terminal of the electromagnetic relay group, and the control signal output terminal of the electromagnetic relay group is connected to the remote control signal input terminal of the mining explosion-proof low-voltage AC feeder switch.

[0014] Furthermore, the signal test end of the three-phase line voltage transformer is connected to the line voltage test part of the mine explosion-proof low-voltage AC feed switch, the signal test end of the three-phase phase voltage transformer is connected to the phase voltage test part of the mine explosion-proof low-voltage AC feed switch, the signal output ends of the three-phase line voltage transformer and the three-phase phase voltage transformer are respectively connected to the signal input end of the signal processing module, and the signal output end of the signal processing module is connected to the phase voltage and line voltage signal input end of the PIC.

[0015] Furthermore, the signal test end of the three-phase current transformer is connected to the current test part of the mining explosion-proof low-voltage AC feeder switch, the signal output end of the three-phase current transformer is connected to the signal input end of the signal integral conversion module, and the signal output end of the signal integral conversion module is connected to the current signal input end of the PIC.

[0016] Furthermore, the reset module is composed of a power supply VCC, a ground terminal GND, a voltage monitoring chip TCM809L, and a current limiting resistor R1; wherein the power supply VCC and the ground terminal GND are respectively connected to the voltage monitoring chip TCM809L terminal ① and the voltage monitoring chip TCM809L terminal ②, the voltage monitoring chip TCM809L terminal ① is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the PIC reset signal terminal; the reset module provides an external reset signal for the full-circuit power factor test system of the DC component short-circuit connection and disconnection test.

[0017] Furthermore, the clock module is composed of a capacitor C1, a capacitor C2, a ground terminal GND1, and a crystal oscillator Y1; wherein the ground terminal GND1 is respectively connected to one end of the capacitor C1, one end of the capacitor C2, and a PIC clock signal input terminal ②, the other end of the capacitor C1 is connected to one end of the crystal oscillator Y1 and the PIC clock signal input terminal ①, and the other end of the capacitor C2 is connected to the other end of the crystal oscillator Y1; the clock module provides a clock signal for the full-circuit power factor test system for the DC component short-circuit connection and disconnection test.

[0018] The DC component short-circuit connection and disconnection test full circuit power factor test method includes the following steps:

[0019] Step 1. Obtain the current curve of the mine explosion-proof low-voltage AC feeder switch through testing;

[0020] Step 2. Calculate using the obtained current curve to obtain the power factor of the short-circuit connection and disconnection test;

[0021] Step 3. Calculate the three-phase power factors of the mining explosion-proof low-voltage AC feeder switch respectively;

[0022] Step 4. Compare the obtained three-phase power factors, determine abnormal data, and issue an early warning.

[0023] Furthermore, the current curve of the explosion-proof low-voltage AC feeder switch for mining is obtained by testing in step 1, and the current curve of the explosion-proof low-voltage AC feeder switch for mining is obtained by testing the full-circuit power factor test system for the DC component short-circuit connection and disconnection test;

[0024] In step 2, the obtained current curve is used for calculation to obtain the power factor of the short-circuit connection and disconnection test; the power factor of the short-circuit connection and disconnection test is obtained by PIC by taking two points on the current curve for calculation. The attenuation law of the DC component in the short-circuit connection and disconnection test current is an exponential change, and the formula is:

[0025] I A =I AP e -t / T(1)

[0026] In the formula, I A is the A phase DC current, I AP is the initial value of the A-phase DC current, T is the time constant of the entire circuit, and t is the short-circuit connection and disconnection time;

[0027] Take time t in the A phase DC current curve m and t n The corresponding DC current is I m and I n ,but:

[0028]

[0029]

[0030] The time constant calculated by formula (2) and (3) is:

[0031]

[0032] Then, the power factor is:

[0033]

[0034] Step 3 is to calculate the three-phase power factor of the explosion-proof low-voltage AC feeder switch for mining separately, and use the DC component short-circuit connection and disconnection test full-circuit power factor test system to calculate the power factors of the three phases A, B, and C of the explosion-proof low-voltage AC feeder switch for mining separately, and then calculate the average value after obtaining the power factors of the three phases A, B, and C. The calculation formula is as follows:

[0035]

[0036] The A, B, and C three-phase load impedances and line impedances of the mine-used explosion-proof low-voltage AC feeder switch are basically consistent, so the three-phase power factor deviation is small;

[0037] In step 4, the three-phase power factors of the obtained mining explosion-proof low-voltage AC feeder switch are compared to determine abnormal data and issue an early warning. The power factor value obtained by calculation is compared with the power factor values ​​of the three phases A, B, and C. If the difference of any phase is greater than 15% of the power factor, the power factor of the phase is considered to be abnormal data, which needs to be retested and an early warning is issued.

[0038] A computer storage medium stores a computer program, which, when executed by a processor, implements the steps of a full-circuit power factor testing method for a DC component short-circuit connection and disconnection test.

[0039] The present invention has the following beneficial effects and advantages:

[0040] The present invention proposes a full-circuit power factor test method for a DC component short-circuit connection and disconnection test, and utilizes a mine explosion-proof electrical appliance connection and disconnection capacity inspection system and life assessment technology to improve the test accuracy of parameters such as power factor and arcing time during the inspection process, ensure the synchronization between the disconnection of the isolating switch and the test current, shorten the inspection cycle, save power resources, and improve the inspection level of the connection and disconnection capacity of mine explosion-proof electrical appliances, provide new ideas for the status evaluation of the mine explosion-proof electrical appliance operation process, and promote the continuous and healthy development of the detection and testing and mine explosion-proof electrical appliance fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0042] Figure 1 It is a simplified structural diagram of the full-circuit power factor test system for the DC component short-circuit connection and disconnection test of the present invention;

[0043] Figure 2 It is the circuit diagram of the reset module of the present invention;

[0044] Figure 3 It is a circuit diagram of a clock module of the present invention;

[0045] Figure 4 It is the current curve of the direct current component short-circuit connection and disconnection test of the present invention.

[0046] In the figure:

[0047] Touch screen 1, communication module 2, power module 3, reset module 4, clock module 5, crystal oscillator module 6, PIC 7, electromagnetic relay group 8, mining explosion-proof low-voltage AC feeder switch 9, signal processing module 10, three-phase line voltage transformer 11, signal integral conversion module 12, three-phase current transformer 13, three-phase phase voltage transformer 14. DETAILED DESCRIPTION

[0048] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0049] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0050] Refer to the following Figure 1-Figure 4The technical solutions of some embodiments of the present invention are described.

[0051] Example 1

[0052] The present invention provides an embodiment, which is a DC component short-circuit connection and disconnection test full circuit power factor test method, which is implemented by using a DC component short-circuit connection and disconnection test full circuit power factor test system, such as Figure 1 As shown, Figure 1 The present invention is a simplified structural diagram of the full-circuit power factor test system for the DC component short-circuit connection and disconnection test.

[0053] The DC component short-circuit connection and disconnection test full-circuit power factor test system mainly includes: a touch screen 1, a communication module 2, a power module 3, a reset module 4, a clock module 5, a crystal oscillator module 6, a PIC 7, an electromagnetic relay group 8, a mining explosion-proof low-voltage AC feeder switch 9, a signal processing module 10, a three-phase line voltage transformer 11, a signal integral conversion module 12, a three-phase current transformer 13, and a three-phase phase voltage transformer 14.

[0054] The signal output end of the touch screen 1 is connected to the signal input end of the communication module 2, and the signal output ends of the communication module 2, the power module 3, the reset module 4, the clock module 5, and the crystal oscillator module 6 are respectively connected to the PIC7 communication signal terminal, the power terminal, the reset signal terminal, the clock signal input terminal, and the crystal oscillator signal input terminal. The clock signal input terminal includes a clock signal input terminal ① and a clock signal input terminal ②.

[0055] The control signal output end of the PIC7 is connected to the control signal input end of the electromagnetic relay group 8, and the control signal output end of the electromagnetic relay group 8 is connected to the remote control signal input end of the mining explosion-proof low-voltage AC feed switch 9.

[0056] The signal test end of the three-phase line voltage transformer 11 is connected to the line voltage test part of the mine explosion-proof low-voltage AC feed switch 9, the signal test end of the three-phase phase voltage transformer 14 is connected to the phase voltage test part of the mine explosion-proof low-voltage AC feed switch 9, the signal output ends of the three-phase line voltage transformer 11 and the three-phase phase voltage transformer 14 are respectively connected to the signal input end of the signal processing module 10, and the signal output end of the signal processing module 10 is connected to the phase voltage and line voltage signal input end of PIC7.

[0057] The signal test end of the three-phase current transformer 13 is connected to the current test part of the mining explosion-proof low-voltage AC feed switch 9, the signal output end of the three-phase current transformer 13 is connected to the signal input end of the signal integral conversion module 12, and the signal output end of the signal integral conversion module 12 is connected to the current signal input end of PIC7.

[0058] like Figure 2 As shown, Figure 2 It is the circuit diagram of the reset module of the present invention. The reset module 4 is composed of a power supply VCC, a ground terminal GND, a voltage monitoring chip TCM809L, and a current limiting resistor R1. Among them, the power supply VCC and the ground terminal GND are respectively connected to the voltage monitoring chip TCM809L terminal ① and the voltage monitoring chip TCM809L terminal ②, the voltage monitoring chip TCM809L terminal ① is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the PIC7 reset signal terminal. The reset module 4 provides an external reset signal for the full-circuit power factor test system for the DC component short-circuit connection and disconnection test.

[0059] like Figure 3 As shown, Figure 3 It is the circuit diagram of the clock module of the present invention. The clock module 5 of the present invention is composed of a capacitor C1, a capacitor C2, a ground terminal GND1, and a crystal oscillator Y1. Among them, the ground terminal GND1 is respectively connected to one end of the capacitor C1, one end of the capacitor C2, and the PIC7 clock signal input terminal ②, the other end of the capacitor C1 is connected to one end of the crystal oscillator Y1 and the PIC7 clock signal input terminal ①, and the other end of the capacitor C2 is connected to the other end of the crystal oscillator Y1. The clock module 5 provides a clock signal for the full circuit power factor test system of the DC component short-circuit connection and disconnection test.

[0060] Example 2

[0061] The present invention further provides an embodiment, which is a method for testing the power factor of a full circuit of a DC component short-circuit connection and disconnection test, comprising the following steps:

[0062] Step 1. Obtain the current curve of the mine explosion-proof low-voltage AC feeder switch through testing;

[0063] In specific implementation, the current curve of the mining explosion-proof low-voltage AC feeder switch 9 is obtained by testing the full-circuit power factor test system of the DC component short-circuit connection and disconnection test, such as Figure 4 As shown, Figure 4 It is the current curve of the direct current component short-circuit connection and disconnection test of the present invention.

[0064] Step 2. Calculate using the obtained current curve to obtain the power factor of the short-circuit connection and disconnection test;

[0065] This embodiment takes phase A as an example for explanation. PIC7 obtains the power factor of the short-circuit connection and disconnection test by taking two points on the current curve for calculation. The DC component attenuation law in the short-circuit connection and disconnection test current is an exponential change, and the formula is:

[0066] IA =I AP e -t / T (1)

[0067] In the formula, I A is the A phase DC current, I AP is the initial value of the A-phase DC current, T is the time constant of the entire circuit, and t is the short-circuit connection and disconnection time.

[0068] Take time t in the A phase DC current curve m and t n The corresponding DC current is I m and I n ,but:

[0069]

[0070]

[0071] The time constant calculated by formula (2) and (3) is:

[0072]

[0073] Then, the power factor is:

[0074]

[0075] Step 3. Calculate the three-phase power factors of the mining explosion-proof low-voltage AC feeder switch respectively;

[0076] The power factor of the three phases A, B and C of the mine explosion-proof low voltage AC feeder switch 9 is calculated separately by using the DC component short circuit connection and disconnection test full circuit power factor test system. After the power factors of the three phases A, B and C are obtained, the average value is calculated. The calculation formula is as follows:

[0077]

[0078] The A, B, C three-phase load impedance and line impedance of the mining explosion-proof low-voltage AC feed switch 9 are basically consistent, so the three-phase power factor deviation is small.

[0079] Step 4. Compare the obtained three-phase power factors of the mining explosion-proof low-voltage AC feeder switch, determine the abnormal data, and issue an early warning.

[0080] In order to ensure the accuracy of the power factor test of the three phases A, B and C of the explosion-proof low voltage AC feeder switch 9 for mining and the reliability of the test results, a power factor verification technology of the deviation comparison method is proposed. The power factor value obtained by calculation is compared with the power factor value of the three phases A, B and C. If the difference of any phase is greater than 15% of the power factor, the power factor of the phase is considered to be abnormal data and needs to be retested.

[0081] Example 3

[0082] Based on the same inventive concept, an embodiment of the present invention further provides a computer storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the full-circuit power factor testing method for the DC component short-circuit connection and disconnection test described in Example 1 or 2 are implemented.

[0083] In the present invention, the terms "connection" and "fixation" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] In the description of the present invention, it is necessary to understand that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0085] In the description of this specification, the description of the terms "one embodiment", "some embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0086] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0087] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0088] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0089] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. The DC component short-circuit connection and disconnection test full circuit power factor test method is implemented using the DC component short-circuit connection and disconnection test full circuit power factor test system, including: A communication module (2), a power module (3), a touch screen (1) and a switch; the test system is characterized in that: the touch screen (1) is connected to the communication module (2); one end of the communication module (2), the power module (3), the reset module (4), the clock module (5) and the crystal oscillator module (6) are respectively connected to the PIC (7); the other end of the PIC (7) is connected to the mine explosion-proof low-voltage AC feeder switch (9) through the electromagnetic relay group (8); one end of the three-phase line voltage transformer (11) and the three-phase phase voltage transformer (14) are respectively connected to the mine explosion-proof low-voltage AC feeder switch (9); the other ends of the three-phase line voltage transformer (11) and the three-phase phase voltage transformer (14) are respectively connected to the mine explosion-proof low-voltage AC feeder switch (9); The touch screen (1) is connected to a signal processing module (10), and the other end of the signal processing module (10) is connected to a PIC (7); one end of a three-phase current transformer (13) is connected to a mining explosion-proof low-voltage AC feeder switch (9), and the other end of the three-phase current transformer (13) is connected to a signal integral conversion module (12), and the other end of the signal integral conversion module (12) is connected to a PIC (7); the signal output end of the touch screen (1) is connected to a signal input end of a communication module (2), and the signal output ends of the communication module (2), the power module (3), the reset module (4), the clock module (5), and the crystal oscillator module (6) are respectively connected to the communication signal wiring terminal, the power wiring terminal, and the reset module (4) of the PIC (7). The control signal output end of the PIC (7) is connected to the control signal input end of the electromagnetic relay group (8), and the control signal output end of the electromagnetic relay group (8) is connected to the remote control signal input end of the mine explosion-proof low-voltage AC feed switch (9); the signal test end of the three-phase line voltage transformer (11) is connected to the line voltage test part of the mine explosion-proof low-voltage AC feed switch (9), and the signal test end of the three-phase phase voltage transformer (14) is connected to the phase voltage test part of the mine explosion-proof low-voltage AC feed switch (9). The signal of the three-phase line voltage transformer (11) and the three-phase phase voltage transformer (14) is connected to the phase voltage test part of the mine explosion-proof low-voltage AC feed switch (9). The output ends are respectively connected to the signal input ends of the signal processing module (10), and the signal output ends of the signal processing module (10) are connected to the phase voltage and line voltage signal input ends of the PIC (7); the signal test end of the three-phase current transformer (13) is connected to the current test part of the mining explosion-proof low-voltage AC feed switch (9), the signal output end of the three-phase current transformer (13) is connected to the signal input end of the signal integral conversion module (12), and the signal output end of the signal integral conversion module (12) is connected to the current signal input end of the PIC (7); the reset module (4) is composed of a power supply VCC, a ground terminal GND, a voltage monitoring chip TCM809L, and a current limiting resistor R1;The power supply VCC and the ground terminal GND are respectively connected to the voltage monitoring chip TCM809L terminal ① and the voltage monitoring chip TCM809L terminal ②, the voltage monitoring chip TCM809L terminal ① is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the PIC (7) reset signal terminal; the reset module (4) provides an external reset signal for the DC component short-circuit connection and disconnection test full-circuit power factor test system; the clock module (5) is composed of a capacitor C1, a capacitor C2, a ground terminal GND1, and a crystal oscillator Y1; wherein the ground terminal GND1 is respectively connected to one end of the capacitor C1, one end of the capacitor C2, and the PIC clock signal input terminal ②, the other end of the capacitor C1 is connected to one end of the crystal oscillator Y1, the PIC clock signal input terminal ①, and the other end of the capacitor C2 is connected to the other end of the crystal oscillator Y1; the clock module (5) provides a clock signal for the DC component short-circuit connection and disconnection test full-circuit power factor test system; The DC component short-circuit connection and disconnection test full circuit power factor test method includes the following steps: Step 1. The current curve of the explosion-proof low-voltage AC feeder switch for mining is obtained by testing, which is obtained by testing the current curve of the explosion-proof low-voltage AC feeder switch for mining by using a DC component short-circuit connection and disconnection test full-circuit power factor test system; Step 2. Use the current curve to calculate and get the power factor of the short-circuit connection and disconnection test. The power factor of the short-circuit connection and disconnection test is calculated by PIC by taking two points on the current curve. The attenuation law of the DC component in the short-circuit connection and disconnection test current is an exponential change. The formula is: I A =I AP yes -t / T (1) In the formula, I A is the A phase DC current, I AP is the initial value of the A-phase DC current, T is the time constant of the entire circuit, and t is the short-circuit connection and disconnection time; Take time t in the A phase DC current curve m and t n The corresponding DC current is I m and I n ,but: The time constant calculated by formula (2) and (3) is: Then, the power factor is: Step 3. Calculate the three-phase power factor of the mine explosion-proof low-voltage AC feeder switch separately. Use the DC component short-circuit connection and disconnection test full-circuit power factor test system to calculate the A, B, and C three-phase power factors of the mine explosion-proof low-voltage AC feeder switch separately. After obtaining the power factors of the three phases A, B, and C, calculate the average value. The calculation formula is as follows: The A, B, and C three-phase load impedances and line impedances of the mine-used explosion-proof low-voltage AC feeder switch are basically consistent, so the three-phase power factor deviation is small; Step 4. Compare the obtained three-phase power factors, determine abnormal data, and issue a warning. The calculated power factor value is compared with the power factor values ​​of phases A, B, and C. If the difference in any phase is greater than 15% of the power factor, the power factor of that phase is considered abnormal data and needs to be retested, and a warning is issued.

2. A computer storage medium, characterized in that: The computer storage medium stores a computer program, and when the computer program is executed by the processor, the steps of the full-circuit power factor testing method for the DC component short-circuit connection and disconnection test described in claim 1 are implemented.

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