CN108469586B - Device and method for checking and judging on-off characteristics of quick grounding switch - Google Patents
Device and method for checking and judging on-off characteristics of quick grounding switch Download PDFInfo
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- CN108469586B CN108469586B CN201810564120.2A CN201810564120A CN108469586B CN 108469586 B CN108469586 B CN 108469586B CN 201810564120 A CN201810564120 A CN 201810564120A CN 108469586 B CN108469586 B CN 108469586B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention provides a device and a method for checking and judging the switching-on and switching-off characteristics of a quick grounding switch, and relates to the technical field of power protection equipment. The device comprises a light filtering device, a CCD high-speed camera, an A/D converter, a current transformer, a voltage transformer and a PC. The method comprises the following steps: shooting an arc image by using a CCD high-speed camera, detecting the arc temperature, and detecting arc current and voltage by using a current transformer and a voltage transformer; and (3) according to the process after the zero crossing of the electric arc, if the temperature is higher than 4000K, providing a thermal breakdown criterion based on the electric arc resistance change process, otherwise, providing an electric breakdown criterion based on the gas breakdown, and determining the breaking characteristic according to the thermal breakdown and electric breakdown judgment result. The invention combines the thermal breakdown and electric breakdown processes, perfects the arc self-extinguishing criterion, is reasonably applied to the process of switching on and off the submerged power supply of the rapid grounding switch, provides a basis for theoretical research of the rapid grounding switch, and has guiding significance for engineering practice.
Description
Technical Field
The invention relates to the technical field of power protection equipment, in particular to a device and a method for checking and judging the switching-on and switching-off characteristics of a quick grounding switch.
Background
The success or failure of single-phase reclosing depends largely on whether the submerged arc at the fault can be extinguished quickly. When a single-phase earth fault occurs to the line, the fault phase breaker is immediately disconnected, and the instant grounding arc light of the fault point is extinguished at the moment, but because stronger electromagnetic coupling and electrostatic coupling exist between the fault phase and the normal phase and between the fault phase and the earth, the fault point is continuously provided with a submerged current to form a submerged arc. Fast grounding switches are widely used because of their ability to extinguish a submerged arc in a power line. The process of completely extinguishing the submerged arc at one time not only comprises the steps of switching on the quick grounding switch to release the submerged current to temporarily extinguish the submerged arc, but also comprises the steps of switching on the quick grounding switch to finish reclosing of a fault phase line, and putting the fault phase line into operation again, wherein in the switching on process, the electromagnetic coupling and electrostatic coupling effects still exist to continuously generate the submerged current, and the success rate of reclosing of the line is directly affected by whether the quick grounding switch can successfully switch on the submerged current.
When the quick grounding switch is opened, because the contact distance is small and the electric field intensity is large, gas breakdown is easy to occur to generate an electric arc between the contacts, and when the potential power supply is near zero, the energy of the electric arc is very low to be extinguished; in a short time after zero crossing, the temperature of the electric arc drops sharply, but a few electric arc plasmas still generate current under the action of recovery voltage to provide energy for the electric arc, meanwhile, the energy is outwards scattered in a heat transfer mode such as conduction, convection and radiation, when the absorbed energy is larger than the scattered energy, thermal breakdown occurs, and in the process, the resistance of the electric arc gradually decreases, so that the change of the electric arc resistance can be used as a breakdown criterion of the thermal breakdown; for SF 6 When the temperature of the gas is lower than 4000K, the arc resistance is large, thermal breakdown is difficult to occur, electric breakdown is a main reason for arc reignition due to the existence of recovery voltage between contacts, and when the Transient Recovery Voltage (TRV) is higher than the critical breakdown voltage of the contacts, electric breakdown occurs, so that the comparison of the critical breakdown voltage and the TRV can be used as a criterion of electric breakdown.
In the prior art, the research object of the switching-on and switching-off characteristics of the high-voltage switch mainly aims at the high-voltage circuit breaker, and the fast grounding switch is lack of in-depth research on the switching-on and switching-off characteristics, and the research thinking is as follows: according to the gas breakdown criterion proposed by the current column theory, the medium recovery characteristic of the insulating medium between the contacts in the no-load breaking process of the circuit breaker is researched to judge whether the high-voltage circuit breaker can successfully break in no-load, and the thought lacks consideration of the heat recovery process, so that if the research result of the former is achieved, the invention of the device and the method for testing the breaking characteristic of the quick grounding switch is particularly important, and the thermal breakdown and the electric breakdown can be detected simultaneously.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the device and the method for checking and judging the switching-on and switching-off characteristics of the quick grounding switch, which have the advantages of simple connection of all parts of the device, convenient input quantity extraction, output quantity storage and export, very intelligent whole device, strong practicability and guidance on engineering practice.
In order to solve the technical problems, the invention adopts the following technical scheme:
on one hand, the invention provides a device for checking and judging the on-off characteristic of a quick grounding switch, which comprises a light filtering device, a CCD high-speed camera, an A/D converter, a current transformer, a voltage transformer and a PC;
the quick grounding switch is arranged at two sides of the circuit, and a pair of opposite quartz windows are arranged at the positions, parallel to the contact points of the two contacts, on the tank body; a light filtering device and a CCD high-speed camera are sequentially arranged at the position, opposite to the quartz window, of the outer part of the tank body of the quick grounding switch; the optical filter device comprises an optical filter and a convex lens which are arranged along the front and back of the light path; the lens of the CCD high-speed camera is aligned with the convex lens of the optical filtering device and is used for collecting electric arcs among the contacts of the quick grounding switch, the video output end of the CCD high-speed camera is connected to the PC after passing through an A/D converter and is used for carrying out analog-digital conversion on electric arc video signals collected by the CCD high-speed camera and inputting the electric arc video signals into the PC;
the current transformer is connected in series with the quick grounding switch and is used for measuring the current flowing through the quick grounding switch, and the current output end of the current transformer is connected to the PC through the other A/D converter; the voltage transformer is connected with the quick grounding switch in parallel and is used for measuring the voltage at two ends of the quick grounding switch, and the voltage output end of the voltage transformer is connected to the PC through a third A/D converter;
the PC is stored with a computer executable judging program, and is used for obtaining an arc temperature value based on a colorimetric temperature measurement method according to an arc video image acquired by the CCD high-speed camera, and judging the breaking characteristics according to the arc temperature value and current and voltage data detected by the current transformer and the voltage transformer.
Further, the optical filter includes a neutral filter and an interference filter disposed back and forth along the optical path.
On the other hand, the invention also provides a method for checking and judging the switching-on and switching-off characteristics of the quick grounding switch, which is realized by adopting the checking and judging device and comprises the following steps:
step 1: real-time monitoring is carried out on the opening and closing process of the quick grounding switch, and a current transformer and a voltage transformer are utilized to measure the current flowing through the quick grounding switch and the voltage at two ends of a contact;
step 2: when an arc appears between the contacts, the filtering device filters the arc between the contacts through the quartz window, and a CCD high-speed camera is used for collecting filtered arc video images;
step 3: the arc video image is subjected to analog-to-digital conversion by an A/D converter, and the converted digital quantity is transmitted into a PC;
step 4: extracting radiation brightness or gray scale of the arc video image in a PC, and obtaining the relation between the temperature and the arc image according to a colorimetric temperature measurement method to obtain the arc temperature;
step 5: when the arc current is near zero, judging whether the arc temperature is greater than 4000K, if so, executing the step 5.1, otherwise, executing the step 5.2;
step 5.1: judging whether thermal breakdown occurs or not by utilizing the change rate of the arc resistance, and then executing the step 6;
step 5.2: by using the value of critical breakdown voltage and U b Transient recovery voltage U TRV To determine whether an electrical breakdown has occurred, and then to perform step 6;
step 6: if the thermal breakdown and the electric breakdown criteria are not met, judging that the quick grounding switch is successfully turned on and off; if one of the two criteria is met, the failure of the disconnection is indicated.
Further, the specific method for judging whether thermal breakdown occurs in the step 5.1 is as follows:
step 5.1.1: monitoring whether the current I of the current transformer is near zero or not, and taking I 0 Is a value of small enough current when I < I 0 When the current is considered to be near zero, executing the step 5.1.2, otherwise, continuing to execute the step 5.1.1;
step 5.1.2: calculating the resistance value R of the arc between the contacts according to the contact voltage U and the current I measured by the voltage transformer and the current transformer, wherein R=U/I;
step 5.1.3: and judging whether thermal breakdown occurs according to the change trend of the arc resistance, if dR/dt is smaller than 0, the thermal breakdown occurs, otherwise, the thermal breakdown does not occur.
Further, the specific method for judging whether the electric breakdown occurs in the step 5.2 is as follows:
step 5.2.1: calculating an air flow field and an electric field in the air chamber near the contact by using Fluent simulation software to obtain a field intensity maximum E and a density minimum rho;
step 5.2.2: the critical breakdown voltage U is calculated according to the following formula b ：U b ＝1.167ρ/E；
Step 5.2.3: by the critical breakdown voltage value and U b Transient recovery voltage U TRV To determine whether a thermoelectric breakdown has occurred, if U b ＜U TRV An electrical breakdown occurs, whereas no electrical breakdown occurs.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: the device and the method for checking and judging the switching-on and switching-off characteristics of the quick grounding switch provided by the invention measure the voltage, the current and the temperature value of the electric arc through the voltage transformer, the current transformer and the CCD high-speed camera by matching with a colorimetric temperature measurement method, and have the advantages of simple connection of all parts of the device and input quantityThe extraction, output quantity preservation and export are convenient, and the whole device is very intelligent; at the same time, the invention uses SF according to the electric quantity detected by the device 6 The gas breakdown criterion is optimized to provide a criterion method for judging the on-off of the rapid grounding switch, so that the gas breakdown criterion has strong practicability and has guiding effect on engineering practice.
Drawings
FIG. 1 is a schematic diagram of a device for testing and judging the on/off characteristics of a fast grounding switch according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a quartz window installation position of a fast grounding switch according to an embodiment of the present invention;
FIG. 3 is a circuit diagram of an A/D converter chip provided by an embodiment of the present invention;
fig. 4 is a flowchart of a method for testing and determining the on/off characteristics of a fast grounding switch according to an embodiment of the present invention.
In the figure: 1. a fast grounding switch; 101. a quartz window; 102. a stationary contact; 103. a moving contact; 104. a tank body; 2. a light filtering device; 201. a light filter; 202. a convex lens; 3. a CCD high-speed camera; 4. an A/D converter; 5. a current transformer; 6. a voltage transformer; 7. and a PC.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
As shown in fig. 1, the present embodiment provides a device for testing and judging the on-off characteristics of a fast grounding switch, which includes: the device comprises a light filtering device 2, a CCD high-speed camera 3, an A/D converter 4, a current transformer 5, a voltage transformer 6 and a PC 7.
The tested quick grounding switch 1 is arranged on two sides of a circuit, and the grounding switch belongs to a closed combined electrical appliance, so that the CCD high-speed camera 3 cannot shoot an arc image between internal contacts from outside, and therefore a pair of quartz windows are formed at the just-separated parallel positions of the movable contact and the fixed contact outside the quick grounding switch tank body, and thus the camera can shoot the arc image between the fixed contact 102 and the movable contact 103 in the tank body 104 through the quartz windows 101, and the installation position of the quartz windows 101 is shown in a schematic diagram of fig. 2.
The filter device 2 includes a filter 201 and a convex lens 202 disposed forward and backward along the optical path.
The filter 201 includes a neutral filter and an interference filter disposed back and forth along the optical path. In the embodiment, the neutral filter adopts a neutral density filter with the model NE502B, the optical density OD value is 0.2, the light transmittance is 63%, the thickness is 3.44mm, the available wave band is 400-1100 nm, the neutral filter is used for filtering and weakening the light intensity, the sensitivity of the CCD high-speed camera 3 is prevented from being influenced by high-intensity light, and an arc image is filtered through the neutral filter; the interference filter selects a 510nm bandpass filter with the model BP808, is used for passing light with a specific wavelength range, the CCD high-speed camera 3 can convert an arc image into a light signal through the bandpass filter, and the arc image passes through the neutral filter and then passes through the bandpass filter to screen light with the specific wavelength.
The model of the convex lens 202 is 11A1399R, the focal length of the lens is 175mm, the resolution of an arc image is amplified through the convex lens 202 after the image is filtered by the optical filter 201, and therefore the CCD high-speed camera 3 can be conveniently shot at a certain distance from the tested fast grounding switch 1.
The CCD high-speed camera 3 is used for shooting an arc image, and is aligned to the convex lens 202 of the optical filtering device, the core device of the CCD high-speed camera is a charge coupled device CCD (Charge Coupled Device for short), the arc image is focused on a CCD chip through a lens, the CCD accumulates charges with corresponding proportion according to the intensity of light, and the charges accumulated by each pixel are processed under the control of video time sequence to form video signal output. The video output end of the CCD high-speed camera 3 is connected to the PC 7 after being subjected to A/D conversion 4, and is used for carrying out analog-to-digital conversion on an arc video signal acquired by the CCD high-speed camera 3 and inputting the arc video signal into the PC 7, and obtaining the corresponding relation between the temperature and an arc image from the arc video signal according to a colorimetric temperature measurement method, so as to obtain the arc temperature.
The colorimetric temperature measurement method is a non-contact temperature measurement method, and is used for measuring the temperature according to the functional relation between the ratio of the spectral radiation brightness of a heat radiating body in two or more wavelength ranges and the temperature, and the relation is as follows:
wherein T is the temperature; c 2 ＝1.44×10 -2 K is a second radiation constant; lambda (lambda) 1 、λ 2 Different radiation wavelengths;brightness of radiation at different wavelengths of radiation; />The ratio coefficient between the radiation brightness and the radiation energy is a function of the radiation brightness of three colors of red, green and blue.
The current transformer 5 is of the model LZZBJ9-10A3G and is used for measuring the current I flowing through the fast grounding switch 1, the current transformer is connected in series in a circuit, and the current value is converted into a digital signal through the other A/D converter 4 and is sent into the PC 7 for subsequent processing.
The voltage transformer 6 is of the model JDG4-0.5100000/100 and is used for measuring the voltage U flowing through the fast grounding switch 1, and is connected in parallel to a circuit, and the voltage value is converted into a digital signal through the third A/D converter 4 and is sent to the PC 7 for subsequent processing.
The three A/D converters 4 in the embodiment all adopt a high-precision AD acquisition chip ADS7809 which is introduced by Burr-Brown company, and the AD acquisition chip ADS7809 is a capacitance-based successive approximation register type analog-digital converter with 16-bit band sampling and holding, the sampling rate of 100kHz and the signal-to-noise ratio of 20kHz input reach 83dB; pin 3 (REF) is the input, pin 8Pin 19 (VANA) and pin 20 (VDIG) are connected with +5V power supply, the output end is pin 13 (SDA) for performing analog-to-digital conversion on arc video signals collected by CCD high-speed camera 3, current measured by current transformer 5 or voltage measured by voltage transformer 6, thus the converted digital signals can be input into PC 7, A/D conversionThe circuit diagram of the converter chip is shown in fig. 3.
The PC 7 stores a computer-executable judging program for obtaining an arc temperature value based on a colorimetric temperature measurement method according to an arc video image collected by the CCD high-speed camera 3, and then judging the switching-on and switching-off characteristics according to the arc temperature value and current and voltage data detected by the current transformer 5 and the voltage transformer 6.
The method for testing and judging the switching-on/off characteristics of the quick grounding switch provided in this embodiment is implemented by using the device for testing and judging the switching-on/off characteristics of the quick grounding switch, and the flowchart of the method is shown in fig. 4, and specifically includes the following steps:
step 1: the on-off process of the quick grounding switch is monitored in real time, and the current flowing through the quick grounding switch 1 and the voltages at the two ends of the contact are measured by using a current transformer 5 and a voltage transformer 6;
step 2: when an arc appears between the contacts, the filter device 2 filters the arc between the contacts, and a CCD high-speed camera 3 collects an arc video image;
step 3: the arc video image is subjected to analog-to-digital conversion by an A/D converter 4, and the digital quantity is transmitted into a PC 7;
step 4: in a PC 7, extracting radiation brightness or gray scale of an arc video image, and obtaining the relation between the temperature and the arc image according to a colorimetric temperature measurement method to obtain the arc temperature;
step 5: when the arc current is near zero, judging whether the arc temperature is greater than 4000K, if so, executing the step 5.1, otherwise, executing the step 5.2;
step 5.1: judging whether thermal breakdown occurs by using a thermal breakdown criterion, and then executing the step 6, wherein the specific method for judging whether thermal breakdown occurs is as follows:
step 5.1.1: monitoring whether the current I of the current transformer is near zero or not, and taking I 0 Is a value of small enough current when I < I 0 When the current is considered to be near zero, executing the step 5.1.2, otherwise, continuing to execute the step 5.1.1; in this embodiment, take I 0 ＝10 - 6 A。
Step 5.1.2: according to the contact voltages U and the currents I measured by the voltage transformer 5 and the current transformer 6, calculating the resistance value R of the arc between the contacts, wherein R=U/I;
step 5.1.3: judging whether thermal breakdown occurs according to the change trend of the arc resistance, if dR/dt is smaller than 0, the thermal breakdown occurs, otherwise, the thermal breakdown does not occur;
step 5.2: judging whether electric breakdown occurs by using an electric breakdown criterion, and then executing the step 6, wherein the specific method for judging whether electric breakdown occurs is as follows:
step 5.2.1: calculating an air flow field and an electric field in the air chamber near the contact by using Fluent simulation software to obtain a field intensity maximum E and a density minimum rho;
step 5.2.2: the critical breakdown voltage U is calculated according to the following formula b ：U b ＝1.167ρ/E；
Step 5.2.3: by the critical breakdown voltage value and U b Transient recovery voltage U TRV To determine whether a thermoelectric breakdown has occurred, if U b ＜U TRV An electrical breakdown occurs, whereas no electrical breakdown occurs;
step 6: if the thermal breakdown and the electric breakdown criteria are not met, judging that the quick grounding switch is successfully opened, and if one of the two criteria is met, indicating that the quick grounding switch is failed to be opened.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions, which are defined by the scope of the appended claims.
Claims (5)
1. The utility model provides a quick earthing switch opens inspection and judgement device of characteristic which characterized in that: the device comprises a light filtering device (2), a CCD high-speed camera (3), an A/D converter (4), a current transformer (5), a voltage transformer (6) and a PC (7);
the quick grounding switch (1) is arranged at two sides of a circuit, and a pair of opposite quartz windows (101) are arranged at the positions, parallel to the contact points of the two contacts, of the tank body (104); a light filtering device (2) and a CCD high-speed camera (3) are sequentially arranged at the position, opposite to the quartz window (101), of the outside of the tank body (104) of the quick grounding switch (1); the optical filter device (2) comprises an optical filter (201) and a convex lens (202) which are arranged along the front and back of the light path; the lens of the CCD high-speed camera (3) is aligned with the convex lens (202) of the optical filtering device (2) and is used for collecting electric arcs among contacts of the quick grounding switch (1), the video output end of the CCD high-speed camera (3) is connected to the PC (7) after passing through an A/D converter (4) and is used for carrying out analog-digital conversion on electric arc video signals collected by the CCD high-speed camera (3) and inputting the electric arc video signals into the PC (7);
the current transformer (5) is connected in series with the quick grounding switch (1) and is used for measuring the current flowing through the quick grounding switch (1), and the current output end of the current transformer (5) is connected to the PC (7) through the other A/D converter (4); the voltage transformer (6) is connected with the quick grounding switch (1) in parallel and is used for measuring the voltage at two ends of the quick grounding switch (1), and the voltage output end of the voltage transformer (6) is connected to the PC (7) through the third A/D converter (4);
the PC (7) is stored with a computer-executable judging program, and is used for obtaining an arc temperature value based on a colorimetric temperature measurement method according to an arc video image acquired by the CCD high-speed camera (3), and judging the breaking characteristics according to the arc temperature value and current and voltage data detected by the current transformer (5) and the voltage transformer (6);
the method for judging the breaking characteristics is as follows: judging whether thermal breakdown occurs by utilizing the change rate of the arc resistance, judging whether electric breakdown occurs by utilizing the comparison of the critical breakdown voltage value and the transient recovery voltage, judging that the quick grounding switch is successfully opened if the thermal breakdown criterion and the electric breakdown criterion are not established, and indicating that the quick grounding switch is failed to be opened if one of the two criteria is established.
2. The device for testing and determining the opening characteristics of a fast grounding switch according to claim 1, wherein: the optical filter (201) comprises a neutral filter and an interference filter which are arranged in front of and behind the optical path.
3. The method for testing and judging the opening characteristics of the quick grounding switch is realized by adopting the device for testing and judging the opening characteristics of the quick grounding switch according to claim 1, and is characterized in that: the method comprises the following steps:
step 1: the switching-on and switching-off process of the quick grounding switch is monitored in real time, and a current transformer (5) and a voltage transformer (6) are utilized to measure the current flowing through the quick grounding switch and the voltage at two ends of a contact;
step 2: when an arc appears between the contacts, the filtering device (2) filters the arc between the contacts through the quartz window (101), and a CCD high-speed camera (3) collects filtered arc video images;
step 3: the arc video image is subjected to analog-to-digital conversion by an A/D converter (4), and the converted digital quantity is transmitted into a PC (7);
step 4: extracting radiation brightness or gray scale of the arc video image in a PC (7), and obtaining the relation between the temperature and the arc image according to a colorimetric temperature measurement method to obtain the arc temperature;
step 5: when the arc current is near zero, judging whether the arc temperature is greater than 4000K, if so, executing the step 5.1, otherwise, executing the step 5.2;
step 5.1: judging whether thermal breakdown occurs or not by utilizing the change rate of the arc resistance, and then executing the step 6;
step 5.2: by means of the value U of the critical breakdown voltage b And transient recovery voltage U TRV To determine whether an electrical breakdown has occurred, and then to perform step 6;
step 6: if the thermal breakdown and the electric breakdown criteria are not met, judging that the quick grounding switch is successfully turned on and off; if one of the two criteria is met, the failure of the disconnection is indicated.
4. The method for testing and determining the opening characteristics of a fast grounding switch according to claim 3, wherein: the specific method for judging whether thermal breakdown occurs in the step 5.1 is as follows:
step 5.1.1: monitoring whether the current I of the current transformer (5) is near zero or not, and taking I 0 Is a value of sufficiently small current, when I<I 0 When the current is considered to be near zero, executing the step 5.1.2, otherwise, continuing to execute the step 5.1.1;
step 5.1.2: according to the contact voltage U and the current I measured by the voltage transformer (6) and the current transformer (5), calculating the resistance value R of the arc between the contacts, wherein R=U/I;
step 5.1.3: and judging whether thermal breakdown occurs according to the change trend of the arc resistance, if dR/dt is less than 0, the thermal breakdown occurs, otherwise, the thermal breakdown does not occur.
5. The method for testing and determining the opening characteristics of a fast grounding switch according to claim 4, wherein: the specific method for judging whether the electric breakdown occurs in the step 5.2 is as follows:
step 5.2.1: calculating an air flow field and an electric field in the air chamber near the contact by using Fluent simulation software to obtain a field intensity maximum E and a density minimum rho;
step 5.2.2: the critical breakdown voltage U is calculated according to the following formula b ＝1.167ρ/E；
Step 5.2.3: by a critical breakdown voltage value U b And transient recovery voltage U TRV To determine whether a thermoelectric breakdown has occurred, if U b <U TRV An electrical breakdown occurs, whereas no electrical breakdown occurs.
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