Method and system for evaluating electrical life of high-voltage switch based on environmental gas decomposition rate

Abstract

This invention discloses a method and system for evaluating the electrical life of high-voltage switches based on the decomposition rate of environmentally friendly gases. The method includes: calculating the rated molar number of environmentally friendly gases in an environmentally friendly mixed gas; conducting an interruption test and calculating the arc energy corresponding to each interruption current; obtaining the percentage reduction in the volume of environmentally friendly gases after the interruption test at each interruption current, and obtaining the molar reduction of environmentally friendly gases corresponding to each interruption current based on the percentage reduction in volume; determining the number of moles of environmentally friendly gases decomposed per unit energy for each interruption current based on the molar reduction and the corresponding arc energy; obtaining the actual arc energy, and determining the amount of environmentally friendly gas decomposed per unit energy for each interruption current based on the actual arc energy and the number of moles of environmentally friendly gases decomposed per unit energy for the corresponding interruption current, and summing them to determine the total amount of environmentally friendly gas decomposed; and evaluating the electrical life of the target high-voltage switch based on the total amount of environmentally friendly gas decomposed and the rated molar number.

Description

Technical Field

[0001] This invention relates to the field of environmentally friendly gas-insulated power transmission and distribution equipment, and more specifically, to a method and system for evaluating the lifespan of high-voltage switchgear based on the decomposition rate of environmentally friendly gases. Background Technology

[0002] Sulfur hexafluoride (SF6) gas is widely used in electrical equipment as an excellent insulating and arc-quenching medium. However, SF6 has a greenhouse effect 24,300 times that of CO2 and an atmospheric lifetime of up to 3,200 years, posing a significant adverse impact on the environment. Domestic and international research indicates that environmentally friendly gases such as perfluoroisobutyronitrile (C4F7N) and trifluoromethanesulfonyl fluoride (CF3SO2F), when mixed with CO2, O2, or N2, exhibit high insulating strength and a low greenhouse effect, and are considered superior environmentally friendly alternatives to SF6. Compared to SF6, environmentally friendly gases generate high-temperature arc plasma under equipment interruption conditions, resulting in significant decomposition or mutual reactions. The recombination characteristics of the gas after arc quenching are slightly inferior, significantly impacting high-capacity breaking capacity and electrical lifetime. Furthermore, the inability of environmentally friendly gases to recombine after decomposition leads to a decrease in their content, not only reducing the electrical lifetime of equipment interruption but also potentially failing to meet the insulation requirements for normal equipment operation. Due to the slightly insufficient stability and recovery ability of environmentally friendly gases, it is necessary to conduct research on the decomposition characteristics under different arc energies to determine whether the switching life of this type of switch can meet the operational requirements throughout its entire lifespan.

[0003] Therefore, a method for assessing the lifespan of high-voltage switchgear based on the decomposition rate of environmentally friendly gases is needed. Summary of the Invention

[0004] This invention proposes a method and system for evaluating the electrical life of high-voltage switches based on the decomposition rate of environmentally friendly gases, in order to solve the problem of how to evaluate the life of high-voltage switches using environmentally friendly gases.

[0005] To address the aforementioned problems, according to one aspect of the present invention, a method for assessing the electrical life of high-voltage switches based on the decomposition rate of environmentally friendly gases is provided, the method comprising:

[0006] Calculate the rated number of moles of environmentally friendly gas in the environmentally friendly gas mixture;

[0007] The arc current and arc voltage of each test are obtained after the environmentally friendly mixed gas is charged into the high-voltage switch and the breaking test is performed. The arc energy corresponding to each breaking current is calculated based on the arc current and arc voltage.

[0008] Obtain the percentage reduction in the volume of environmentally friendly gas after the high-voltage switch has completed the interruption test at each interruption current, and obtain the number of moles of environmentally friendly gas reduced for each interruption current based on the percentage reduction in volume.

[0009] The number of moles of environmentally friendly gas reduced per unit energy corresponding to each breaking current is determined based on the number of moles of environmentally friendly gas reduced per breaking current and the corresponding arc energy.

[0010] The actual arc energy of the target high-voltage switch filled with the environmentally friendly mixed gas after each interruption is obtained. Based on the actual arc energy and the number of moles of environmentally friendly gas decomposed per unit energy corresponding to the interruption current, the amount of environmentally friendly gas decomposed for each interruption current is determined, and the total amount of environmentally friendly gas decomposed is determined by summing them up.

[0011] The electrical life of the target high-voltage switch is evaluated based on the total amount of environmentally friendly gas decomposed and the rated molar number.

[0012] Preferably, the environmentally friendly mixed gas is composed of an environmentally friendly gas and a buffer gas; the environmentally friendly gas includes perfluoroisobutyronitrile or trifluoromethanesulfonyl fluoride; the buffer gas includes carbon dioxide, oxygen and / or nitrogen.

[0013] Preferably, the method calculates the rated molar number and the reduced molar number of the environmentally friendly gas using the following method:

[0014]

[0015] Where, n r The rated number of moles; p is the rated gas pressure; k1 is the volume percentage of the environmentally friendly gas in the environmentally friendly mixed gas; V is the high-voltage switch volume; n d K is the number of moles of environmentally friendly gas reduced; k2 is the volume percentage of environmentally friendly gas reduced; R is a set coefficient; T is a temperature coefficient.

[0016] Preferably, the calculation of the arc energy under each breaking current based on the arc current and arc voltage includes:

[0017]

[0018] Among them, E a U is the arc energy under any breaking current; n is the number of tests; u ak i ak and t ak These represent the arc voltage, arc current, and arc duration for the kth interruption, respectively.

[0019] Preferably, the method for obtaining the volume percentage reduction of environmentally friendly gas after the interruption test of the high-voltage switch at each interruption current includes:

[0020] Gas chromatography or gas chromatography-mass spectrometry is used to detect the content of characteristic gases obtained from the decomposition of environmentally friendly gases after the high-voltage switch has completed the breaking test at each breaking current, and the volume percentage of the environmentally friendly gas reduction is determined based on the content relationship between the environmentally friendly gas and the characteristic gas.

[0021] Preferably, determining the amount of environmentally friendly gas decomposed per unit energy based on the actual arc energy and the number of moles of environmentally friendly gas decomposed per unit energy corresponding to the corresponding breaking current includes:

[0022] n a =E a *R C4 ,

[0023] Where, n a E represents the amount of environmentally friendly gas decomposed for any given breaking current. a R represents the actual arcing energy corresponding to any given breaking current. C4 This represents the number of moles of the environmentally friendly gas decomposed per unit energy corresponding to any given breaking current.

[0024] Preferably, the evaluation of the electrical life of the target high-voltage switch based on the decomposition amount and rated molar number includes:

[0025] If n at / n r If n < P, then the target high-voltage switch has breaking capacity and can continue to be used; otherwise, the target high-voltage switch has no breaking capacity and has reached the end of its electrical life; where n at n represents the total amount of environmentally friendly gas decomposition. r is the rated number of moles; P is the preset threshold.

[0026] According to another aspect of the present invention, a high-voltage switch electrical life assessment system based on the decomposition rate of environmentally friendly gases is provided, the system comprising:

[0027] Rated mole number calculation unit, used to calculate the rated mole number of environmentally friendly gases in environmentally friendly mixed gases;

[0028] The arc energy calculation unit is used to obtain the arc current and arc voltage of each test after the environmentally friendly mixed gas is filled into the high-voltage switch and the breaking test is performed, and to calculate the arc energy corresponding to each breaking current based on the arc current and arc voltage.

[0029] The mole reduction calculation unit is used to obtain the volume percentage of environmentally friendly gas reduced after the interruption test of the high-voltage switch under each interruption current, and to obtain the mole reduction of environmentally friendly gas corresponding to each interruption current based on the volume reduction percentage.

[0030] The decomposition mole number calculation unit is used to determine the decomposition mole number of the environmentally friendly gas corresponding to each breaking current under unit energy based on the reduced mole number of the environmentally friendly gas corresponding to each breaking current and the corresponding arc energy.

[0031] The environmental gas decomposition amount determination unit is used to obtain the actual arc energy of the target high-voltage switch filled with the environmental mixed gas after each interruption, and based on the actual arc energy and the number of moles of environmental gas decomposed per unit energy corresponding to the interruption current, determine the environmental gas decomposition amount corresponding to each interruption current, and sum them to determine the total amount of environmental gas decomposition.

[0032] An evaluation unit is used to evaluate the electrical life of the target high-voltage switch based on the total amount of environmentally friendly gas decomposed and the rated molar number.

[0033] Preferably, the environmentally friendly mixed gas is composed of an environmentally friendly gas and a buffer gas; the environmentally friendly gas includes perfluoroisobutyronitrile or trifluoromethanesulfonyl fluoride; the buffer gas includes carbon dioxide, oxygen and / or nitrogen.

[0034] Preferably, the rated mole number calculation unit and the reduced mole number calculation unit calculate the rated mole number and the reduced mole number of the environmentally friendly gas using the following method:

[0035]

[0036] Where, n r The rated number of moles; p is the rated gas pressure; k1 is the volume percentage of the environmentally friendly gas in the environmentally friendly mixed gas; V is the high-voltage switch volume; n d K is the number of moles of environmentally friendly gas reduced; k2 is the volume percentage of environmentally friendly gas reduced; R is a set coefficient; T is a temperature coefficient.

[0037] Preferably, the arc energy calculation unit calculates the arc energy under each breaking current based on the arc current and arc voltage, including:

[0038]

[0039] Among them, E a U is the arc energy under any breaking current; n is the number of tests; u ak i ak and t ak These represent the arc voltage, arc current, and arc duration for the kth interruption, respectively.

[0040] Preferably, the molar reduction calculation unit obtains the volume percentage of environmentally friendly gas reduction after the high-voltage switch completes the breaking test at each breaking current, including:

[0041] Gas chromatography or gas chromatography-mass spectrometry is used to detect the content of characteristic gases obtained from the decomposition of environmentally friendly gases after the high-voltage switch has completed the breaking test at each breaking current, and the volume percentage of the environmentally friendly gas reduction is determined based on the content relationship between the environmentally friendly gas and the characteristic gas.

[0042] Preferably, the environmentally friendly gas decomposition amount determination unit determines the environmentally friendly gas decomposition amount corresponding to each breaking current based on the actual arc energy and the number of moles of environmentally friendly gas decomposed per unit energy corresponding to the corresponding breaking current, including:

[0043] n a =E a *R C4 ,

[0044] Where, n a E represents the amount of environmentally friendly gas decomposed for any given breaking current. a R represents the actual arcing energy corresponding to any given breaking current. C4 This represents the number of moles of the environmentally friendly gas decomposed per unit energy corresponding to any given breaking current.

[0045] Preferably, the evaluation unit evaluates the electrical life of the target high-voltage switch based on the decomposition amount and the rated molar number, including:

[0046] If n at / n r If n < P, then the target high-voltage switch has breaking capacity and can continue to be used; otherwise, the target high-voltage switch has no breaking capacity and has reached the end of its electrical life; where n at n represents the total amount of environmentally friendly gas decomposition. r is the rated number of moles; P is the preset threshold.

[0047] According to another aspect of the present invention, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the steps in a method for evaluating the electrical life of a high-voltage switch based on the decomposition rate of environmentally friendly gases.

[0048] According to another aspect of the present invention, the present invention provides an electronic device, comprising:

[0049] The aforementioned computer-readable storage medium; and

[0050] One or more processors for executing a program in the computer-readable storage medium.

[0051] This invention provides a method and system for evaluating the electrical life of a high-voltage switch based on the decomposition rate of environmentally friendly gases. The method includes: calculating the rated molar number of environmentally friendly gases in an environmentally friendly mixed gas; obtaining the arc current and arc voltage of each test after the environmentally friendly mixed gas is charged into the high-voltage switch and an interruption test is performed, and calculating the arc energy corresponding to each interruption current based on the arc current and arc voltage; obtaining the percentage reduction in the volume of environmentally friendly gases after each interruption test at each interruption current, and obtaining the molar reduction of environmentally friendly gases corresponding to each interruption current based on the percentage reduction in volume; determining the number of decomposed moles of environmentally friendly gases per unit energy for each interruption current based on the molar reduction of environmentally friendly gases per interruption current; obtaining the actual arc energy of the target high-voltage switch filled with the environmentally friendly mixed gas after each interruption, and determining the amount of environmentally friendly gas decomposed per unit energy based on the actual arc energy and the number of decomposed moles of environmentally friendly gases per unit energy for the corresponding interruption current, and summing these to determine the total amount of environmentally friendly gas decomposed; and evaluating the electrical life of the target high-voltage switch based on the total amount of environmentally friendly gas decomposed and the rated molar number. This invention provides a highly accurate assessment of the electrical life of high-voltage switches based on the decomposition amount of environmentally friendly gases, and can provide technical support for the safe and reliable operation of environmentally friendly gas high-voltage switches. Attached Figure Description

[0052] Exemplary embodiments of the present invention can be more fully understood by referring to the following figures:

[0053] Figure 1 A flowchart of a high-voltage switch electrical life assessment method 100 based on environmentally friendly gas decomposition rate according to an embodiment of the present invention.

[0054] Figure 2 This is a schematic diagram of the structure of a high-voltage switch electrical life assessment system 200 based on the decomposition rate of environmentally friendly gases according to an embodiment of the present invention. Detailed Implementation

[0055] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0056] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0057] To address the problem of evaluating the electrical life of high-voltage switches, this invention conducts arc breaking tests on high-voltage switches filled with environmentally friendly gas under different currents and arc energies. The changes in the content of characteristic decomposition gases after the arc tests are detected, and the change in the number of moles of environmentally friendly gas and the gas decomposition rate per unit arc energy are calculated. The voltage and current signals during each interruption of the environmentally friendly gas high-voltage switch are monitored to obtain the number of moles of environmentally friendly gas and evaluate the electrical life of the high-voltage switch, providing a reference for the normal operation of environmentally friendly gas circuit breakers.

[0058] Figure 1 This is a flowchart of a high-voltage switch electrical life assessment method 100 based on the decomposition rate of environmentally friendly gases according to an embodiment of the present invention. Figure 1 As shown, the high-voltage switch electrical life assessment method based on the decomposition rate of environmentally friendly gases provided by this invention can accurately assess the electrical life of high-voltage switches based on the amount of environmentally friendly gas decomposition, providing technical support for the safe and reliable operation of environmentally friendly gas high-voltage switches. The high-voltage switch electrical life assessment method 100 based on the decomposition rate of environmentally friendly gases provided by this invention begins at step 101, where the rated number of moles of environmentally friendly gas in the environmentally friendly mixed gas is calculated.

[0059] Preferably, the environmentally friendly mixed gas is composed of an environmentally friendly gas and a buffer gas; the environmentally friendly gas includes perfluoroisobutyronitrile or trifluoromethanesulfonyl fluoride; the buffer gas includes carbon dioxide, oxygen and / or nitrogen.

[0060] Preferably, the method calculates the nominal number of moles using the following method:

[0061]

[0062] Where, n r ρ is the rated number of moles; p is the rated gas pressure; k1 is the volume percentage of the environmentally friendly gas in the environmentally friendly mixed gas; V is the high-voltage switch volume; R is the setting coefficient; T is the temperature coefficient.

[0063] In this invention, the environmentally friendly mixed gas is composed of an environmentally friendly gas and a buffer gas. The environmentally friendly gas includes perfluoroisobutyronitrile (C4F7N) or trifluoromethanesulfonyl fluoride (CF3SO2F); the buffer gas includes carbon dioxide (CO2), oxygen (O2), and / or nitrogen (N2). If the rated pressure is p, the volume percentage of C4F7N is k1, and the high-voltage switch volume is V, the rated molar number n of C4F7N gas can be calculated. r for:

[0064]

[0065] Where R is 8.314 and T is room temperature 273.15K.

[0066] In step 102, the arc current and arc voltage of each test after the environmentally friendly mixed gas is charged into the high-voltage switch and the breaking test is performed are obtained, and the arc energy corresponding to each breaking current is calculated based on the arc current and arc voltage.

[0067] Preferably, the calculation of the arc energy under each breaking current based on the arc current and arc voltage includes:

[0068]

[0069] Among them, E a U is the arc energy under any breaking current; n is the number of tests; u ak i ak and t ak These represent the arc voltage, arc current, and arc duration for the kth interruption, respectively.

[0070] In this invention, an environmentally friendly mixed gas is introduced into a high-voltage switch and an opening and closing test is conducted to obtain the arc current and arc voltage of each test, and the arc energy corresponding to each opening current is calculated based on the arc current and arc voltage.

[0071] Taking C4F7N as an environmentally friendly gas as an example, the mixed environmentally friendly gas is charged into high-voltage switches such as circuit breakers with a rated voltage of 126kV and above, and breaking tests with currents of 20kA to 63kA are carried out according to the requirements of GB 1984-2014 "High Voltage AC Circuit Breakers", with no less than 20 breaking tests at each current. Arc voltage and arc current monitoring sensors are installed on the high-voltage switches to record the arc voltage u at each switch opening and closing. a Arc current i a Waveform, arcing time t a Let E be the duration of the arc current. Substitute this into equation (2) to calculate the arc energy E for each interruption. a Among them, each interrupting current I b The arc energy E belowa for:

[0072]

[0073] In the formula, n is the number of tests for each breaking current, and u ak i ak t ak These represent the arc voltage and arc current waveforms for the kth interruption, and the arc duration, respectively.

[0074] In step 103, the volume percentage of environmentally friendly gas reduced after the interruption test of the high-voltage switch at each interruption current is obtained, and the number of moles of environmentally friendly gas reduced for each interruption current is obtained based on the volume percentage of reduction.

[0075] Preferably, the method for obtaining the volume percentage reduction of environmentally friendly gas after the interruption test of the high-voltage switch at each interruption current includes:

[0076] Gas chromatography or gas chromatography-mass spectrometry is used to detect the content of characteristic gases obtained from the decomposition of environmentally friendly gases after the high-voltage switch has completed the breaking test at each breaking current, and the volume percentage of the environmentally friendly gas reduction is determined based on the content relationship between the environmentally friendly gas and the characteristic gas.

[0077] Preferably, the method calculates the reduction in moles of environmentally friendly gases using the following method:

[0078]

[0079] Where, n d The reduction in the number of moles of environmentally friendly gas; p is the rated gas pressure; V is the high-voltage switch volume; k2 is the percentage of volume reduction of environmentally friendly gas; R is the setting coefficient; T is the temperature coefficient.

[0080] In this invention, gas chromatography or gas chromatography-mass spectrometry is used to detect the content of characteristic gases obtained from the decomposition of environmentally friendly gases after the high-voltage switch completes the breaking test at each breaking current. Based on the content relationship between the environmentally friendly gases and the characteristic gases, the volume percentage reduction of the environmentally friendly gases is determined, and the number of moles of environmentally friendly gases reduced (n) corresponding to each breaking current is obtained based on the volume percentage reduction. d .

[0081] Continuing with C4F7N as an environmentally friendly gas as an example, gas chromatography or gas chromatography-mass spectrometry is used to detect the high-voltage switch in each I... b The content of CF4 gas, a characteristic gas, in the environmentally friendly gas after n interruptions is c. f Based on the relationship between the characteristic gas CF4 produced by the decomposition of C4F7N, the volume percentage k of the reduction in C4F7N is obtained. d7 / 4c f Substitute The calculation yields the number of moles of C4F7N gas reduced, n. d The relationship between C4F7N and the characteristic gas CF4 produced by its decomposition is as follows:

[0082]

[0083] In step 104, the number of moles of environmentally friendly gas reduced per unit energy corresponding to each breaking current is determined based on the number of moles of environmentally friendly gas reduced per breaking current and the corresponding arc energy.

[0084] In this invention, for any interrupting current, based on the corresponding reduction in the number of moles n b and arc energy E a The ratio of the two values ​​determines the number of moles R of the environmentally friendly gas decomposed per unit energy corresponding to any given breaking current. C4 .

[0085] In step 105, the actual arcing energy of the target high-voltage switch filled with the environmentally friendly mixed gas after each interruption is obtained, and based on the actual arcing energy and the number of moles of environmentally friendly gas decomposed per unit energy corresponding to the interruption current, the amount of environmentally friendly gas decomposed for each interruption current is determined, and the total amount of environmentally friendly gas decomposed is summed to determine the total amount of environmentally friendly gas decomposed.

[0086] Preferably, determining the amount of environmentally friendly gas decomposed per unit energy based on the actual arc energy and the number of moles of environmentally friendly gas decomposed per unit energy corresponding to the corresponding breaking current includes:

[0087] n a =E a *R C4 ,

[0088] Where, n a E represents the amount of environmentally friendly gas decomposed for any given breaking current. a R represents the actual arcing energy corresponding to any given breaking current. C4 This represents the number of moles of the environmentally friendly gas decomposed per unit energy corresponding to any given breaking current.

[0089] In this invention, and in practice, an arc voltage and arc current monitoring sensor module is installed on the target high-voltage switch filled with environmentally friendly mixed gas to record the arc voltage u at each switch opening and closing. a Arc current i a Waveform, arcing time t a Let E be the duration of the arc current, and calculate the actual arc energy E for each interruption. a Based on the actual arc energy E aAnd the number of moles of the environmentally friendly gas decomposed per unit energy corresponding to the corresponding breaking current, R C4 Using formula n a＝ E a *R C4 Determine the amount of environmentally friendly gas decomposition n corresponding to each breaking current. a And sum to calculate the total amount of environmentally friendly gas decomposition n after multiple interruptions. at .

[0090] In step 106, the electrical life of the target high-voltage switch is evaluated based on the total amount of environmentally friendly gas decomposed and the rated molar number.

[0091] Preferably, the evaluation of the electrical life of the target high-voltage switch based on the decomposition amount and rated molar number includes:

[0092] If n at / n r If n < P, then the target high-voltage switch has breaking capacity and can continue to be used; otherwise, the target high-voltage switch has no breaking capacity and has reached the end of its electrical life; where n at n represents the total amount of environmentally friendly gas decomposition. r is the rated number of moles; P is the preset threshold.

[0093] In this invention, P can be set to 10%. If n at / n r If the percentage is less than 10%, it indicates that the environmentally friendly gas high-voltage switch still has breaking capacity and can continue to be used; otherwise, it indicates that the switch has no breaking capacity, has reached the end of its electrical life, and should be taken out of service.

[0094] This invention takes an environmentally friendly mixed gas containing the environmentally friendly gas C4F7N as an example. First, it conducts breaking tests on a high-voltage switch of the environmentally friendly mixed gas with a determined C4F7N volume ratio under different currents and arc energies. The number of moles of C4F7N decomposed is obtained by detecting the content of the characteristic decomposition gas CF4. Then, the arc voltage and arc current waveforms of the high-voltage switch are monitored in real time during the breaking process. The number of moles of C4F7N decomposed during each breaking process is analyzed. The ratio of the cumulative number of moles of C4F7N decomposed to the rated number of moles is used to assess whether the electrical life of the high-voltage switch has ended, which can ensure the safe and reliable operation of the C4F7N environmentally friendly gas high-voltage switch.

[0095] Figure 2 This is a schematic diagram of the structure of a high-voltage switch electrical life assessment system 200 based on the decomposition rate of environmentally friendly gases according to an embodiment of the present invention. Figure 2As shown, the high-voltage switch electrical life assessment system 200 based on the decomposition rate of environmentally friendly gases provided in this embodiment of the invention includes: a rated molar number calculation unit 201, an arc energy calculation unit 202, a reduced molar number calculation unit 203, a decomposed molar number calculation unit 204, an environmentally friendly gas decomposition amount determination unit 205, and an assessment unit 206.

[0096] Preferably, the rated molar number calculation unit 201 is used to calculate the rated molar number of environmentally friendly gas in the environmentally friendly mixed gas.

[0097] Preferably, the environmentally friendly mixed gas is composed of an environmentally friendly gas and a buffer gas; the environmentally friendly gas includes perfluoroisobutyronitrile or trifluoromethanesulfonyl fluoride; the buffer gas includes carbon dioxide, oxygen and / or nitrogen.

[0098] Preferably, the arc energy calculation unit 202 is used to obtain the arc current and arc voltage of each test after the environmentally friendly mixed gas is charged into the high-voltage switch and a breaking test is performed, and to calculate the arc energy corresponding to each breaking current based on the arc current and arc voltage.

[0099] Preferably, the arc energy calculation unit 202 calculates the arc energy under each breaking current based on the arc current and arc voltage, including:

[0100]

[0101] Among them, E a U is the arc energy under any breaking current; n is the number of tests; u ak i ak and t ak These represent the arc voltage, arc current, and arc duration for the kth interruption, respectively.

[0102] Preferably, the mole reduction calculation unit 203 is used to obtain the volume percentage of environmentally friendly gas reduced after the high-voltage switch completes the interruption test at each interruption current, and to obtain the mole reduction of environmentally friendly gas corresponding to each interruption current based on the volume reduction percentage.

[0103] Preferably, the molar reduction calculation unit 203 obtains the percentage reduction in the volume of environmentally friendly gas after the high-voltage switch completes the breaking test at each breaking current, including:

[0104] Gas chromatography or gas chromatography-mass spectrometry is used to detect the content of characteristic gases obtained from the decomposition of environmentally friendly gases after the high-voltage switch has completed the breaking test at each breaking current, and the volume percentage of the environmentally friendly gas reduction is determined based on the content relationship between the environmentally friendly gas and the characteristic gas.

[0105] Preferably, the rated mole number calculation unit 201 and the reduced mole number calculation unit 203 calculate the rated mole number and the reduced mole number of the environmentally friendly gas in the following manner:

[0106]

[0107] Where, n r The rated number of moles; p is the rated gas pressure; k1 is the volume percentage of the environmentally friendly gas in the environmentally friendly mixed gas; V is the high-voltage switch volume; n d K is the number of moles of environmentally friendly gas reduced; k2 is the volume percentage of environmentally friendly gas reduced; R is a set coefficient; T is a temperature coefficient.

[0108] Preferably, the decomposition mole number calculation unit 204 is used to determine the decomposition mole number of the environmentally friendly gas corresponding to each breaking current under unit energy based on the reduced mole number of the environmentally friendly gas corresponding to each breaking current and the corresponding arc energy.

[0109] Preferably, the environmentally friendly gas decomposition amount determination unit 205 is used to obtain the actual arc energy of the target high-voltage switch filled with the environmentally friendly mixed gas after each interruption, and based on the actual arc energy and the number of moles of environmentally friendly gas decomposed per unit energy corresponding to the interruption current, determine the amount of environmentally friendly gas decomposition corresponding to each interruption current, and sum them to determine the total amount of environmentally friendly gas decomposition.

[0110] Preferably, the environmentally friendly gas decomposition amount determination unit 205 determines the amount of environmentally friendly gas decomposition corresponding to each breaking current based on the actual arc energy and the number of moles of environmentally friendly gas decomposed per unit energy corresponding to the corresponding breaking current. Determining the amount of environmentally friendly gas decomposition corresponding to each breaking current includes:

[0111] n a＝ E a *R C4 ,

[0112] Where, n a E represents the amount of environmentally friendly gas decomposed for any given breaking current. a R represents the actual arcing energy corresponding to any given breaking current. C4 This represents the number of moles of the environmentally friendly gas decomposed per unit energy corresponding to any given breaking current.

[0113] Preferably, the evaluation unit 206 is used to evaluate the electrical life of the target high-voltage switch based on the total amount of environmentally friendly gas decomposition and the rated molar number.

[0114] Preferably, the evaluation unit 206 evaluates the electrical life of the target high-voltage switch based on the decomposition amount and rated molar number, including:

[0115] If n at / n r If n < P, then the target high-voltage switch has breaking capacity and can continue to be used; otherwise, the target high-voltage switch has no breaking capacity and has reached the end of its electrical life; where n at n represents the total amount of environmentally friendly gas decomposition. r is the rated number of moles; P is the preset threshold.

[0116] The high-voltage switch electrical life assessment system 200 based on the environmentally friendly gas decomposition rate of this invention corresponds to the high-voltage switch electrical life assessment method 100 based on the environmentally friendly gas decomposition rate of another embodiment of this invention, and will not be described again here.

[0117] According to another aspect of the present invention, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the steps in a method for evaluating the electrical life of a high-voltage switch based on the decomposition rate of environmentally friendly gases.

[0118] According to another aspect of the present invention, the present invention provides an electronic device, comprising:

[0119] The aforementioned computer-readable storage medium; and

[0120] One or more processors for executing a program in the computer-readable storage medium.

[0121] The invention has been described with reference to a few embodiments. However, as will be known to those skilled in the art, and as defined in the appended claims, other embodiments besides those disclosed above fall equivalently within the scope of the invention.

[0122] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the art, unless otherwise expressly defined herein. All references to “a / the / the [device, component, etc.]” ​​are openly interpreted as at least one instance of said device, component, etc., unless otherwise expressly stated. The steps of any method disclosed herein need not be performed in the exact order disclosed unless explicitly stated otherwise.

[0123] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0124] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0125] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0126] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do 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. A method for evaluating the electrical life of high-voltage switches based on the decomposition rate of environmentally friendly gases, characterized in that, The method includes: Calculate the rated number of moles of environmentally friendly gas in the environmentally friendly gas mixture; The arc current and arc voltage of each test are obtained after the environmentally friendly mixed gas is charged into the high-voltage switch and the breaking test is performed. The arc energy corresponding to each breaking current is calculated based on the arc current and arc voltage. The volume percentage of environmentally friendly gas reduced after the high-voltage switch interrupts the test at each interruption current is obtained, and the number of moles of environmentally friendly gas reduced for each interruption current is obtained based on the volume percentage of reduction. The number of moles of environmentally friendly gas reduced per unit energy corresponding to each breaking current is determined based on the number of moles of environmentally friendly gas reduced per breaking current and the corresponding arc energy. The actual arc energy of the target high-voltage switch filled with the environmentally friendly mixed gas after each interruption is obtained. Based on the actual arc energy and the number of moles of environmentally friendly gas decomposed per unit energy corresponding to the interruption current, the amount of environmentally friendly gas decomposed for each interruption current is determined, and the total amount of environmentally friendly gas decomposed is determined by summing them up. The electrical life of the target high-voltage switch is evaluated based on the total amount of environmentally friendly gas decomposed and the rated molar number.

2. The method according to claim 1, characterized in that, The environmentally friendly mixed gas is composed of a mixture of an environmentally friendly gas and a buffer gas; the environmentally friendly gas includes: perfluoroisobutyronitrile or trifluoromethanesulfonyl fluoride; the buffer gas includes: carbon dioxide, oxygen and / or nitrogen.

3. The method according to claim 1, characterized in that, The method calculates the rated molar number and the reduction in molar number of environmentally friendly gases using the following methods: Where, n r The rated number of moles; p is the rated gas pressure; k1 is the volume percentage of the environmentally friendly gas in the environmentally friendly mixed gas; V is the high-voltage switch volume; n d K is the number of moles of environmentally friendly gas reduced; k2 is the volume percentage of environmentally friendly gas reduced; R is a set coefficient; T is a temperature coefficient.

4. The method according to claim 1, characterized in that, The arc energy under each breaking current is calculated based on the arc current and arc voltage, including: Among them, E a U is the arc energy under any breaking current; n is the number of tests; u ak i ak and t ak These represent the arc voltage, arc current, and arc duration for the kth interruption, respectively.

5. The method according to claim 1, characterized in that, The method of obtaining the percentage reduction in the volume of environmentally friendly gas after the interruption test of the high-voltage switch at each interruption current includes: Gas chromatography or gas chromatography-mass spectrometry is used to detect the content of characteristic gases obtained from the decomposition of environmentally friendly gases after the high-voltage switch has completed the breaking test at each breaking current, and the volume percentage of the environmentally friendly gas reduction is determined based on the content relationship between the environmentally friendly gas and the characteristic gas.

6. The method according to claim 1, characterized in that, The determination of the amount of environmentally friendly gas decomposed per unit energy based on the actual arc energy and the number of moles of environmentally friendly gas decomposed per unit energy corresponding to the corresponding breaking current includes: n a＝ E a *R C4 , Where, n a E represents the amount of environmentally friendly gas decomposed for any given breaking current. a R represents the actual arcing energy corresponding to any given breaking current. C4 This represents the number of moles of the environmentally friendly gas decomposed per unit energy corresponding to any given breaking current.

7. The method according to claim 1, characterized in that, The evaluation of the electrical life of the target high-voltage switch based on the decomposition amount and rated molar number includes: If n at / n r If n < P, then the target high-voltage switch is determined to have breaking capacity and can continue to be used; otherwise, the target high-voltage switch is determined to have no breaking capacity and has reached the end of its electrical life; where n at n represents the total amount of environmentally friendly gas decomposition. r is the rated number of moles; P is the preset threshold.

8. A high-voltage switchgear life assessment system based on the decomposition rate of environmentally friendly gases, characterized in that, The system includes: Rated mole number calculation unit, used to calculate the rated mole number of environmentally friendly gases in environmentally friendly mixed gases; The arc energy calculation unit is used to obtain the arc current and arc voltage of each test after the environmentally friendly mixed gas is filled into the high-voltage switch and the breaking test is performed, and to calculate the arc energy corresponding to each breaking current based on the arc current and arc voltage. The mole reduction calculation unit is used to obtain the volume percentage of environmentally friendly gas reduced after the interruption test of the high-voltage switch under each interruption current, and to obtain the mole reduction of environmentally friendly gas corresponding to each interruption current based on the volume reduction percentage. The decomposition mole number calculation unit is used to determine the decomposition mole number of the environmentally friendly gas corresponding to each breaking current under unit energy based on the reduced mole number of the environmentally friendly gas corresponding to each breaking current and the corresponding arc energy. The environmental gas decomposition amount determination unit is used to obtain the actual arc energy of the target high-voltage switch filled with the environmental mixed gas after each interruption, and based on the actual arc energy and the number of moles of environmental gas decomposed per unit energy corresponding to the interruption current, determine the environmental gas decomposition amount corresponding to each interruption current, and sum them to determine the total amount of environmental gas decomposition. An evaluation unit is used to evaluate the electrical life of the target high-voltage switch based on the total amount of environmentally friendly gas decomposed and the rated molar number.

9. The system according to claim 8, characterized in that, The environmentally friendly mixed gas is composed of a mixture of an environmentally friendly gas and a buffer gas; the environmentally friendly gas includes: perfluoroisobutyronitrile or trifluoromethanesulfonyl fluoride; the buffer gas includes: carbon dioxide, oxygen and / or nitrogen.

10. The system according to claim 8, characterized in that, The rated mole number calculation unit and the reduced mole number calculation unit calculate the rated mole number and the reduced mole number of the environmentally friendly gas using the following methods: Where, n r The rated number of moles; p is the rated gas pressure; k1 is the volume percentage of the environmentally friendly gas in the environmentally friendly mixed gas; V is the high-voltage switch volume; n d K is the number of moles of environmentally friendly gas reduced; k2 is the volume percentage of environmentally friendly gas reduced; R is a set coefficient; T is a temperature coefficient.

11. The system according to claim 8, characterized in that, The arc energy calculation unit calculates the arc energy under each breaking current based on the arc current and arc voltage, including: Among them, E a U is the arc energy under any breaking current; n is the number of tests; u ak i ak and t ak These represent the arc voltage, arc current, and arc duration for the kth interruption, respectively.

12. The system according to claim 8, characterized in that, The molar reduction calculation unit obtains the percentage reduction in the volume of environmentally friendly gas after the high-voltage switch completes the breaking test at each breaking current, including: Gas chromatography or gas chromatography-mass spectrometry is used to detect the content of characteristic gases obtained from the decomposition of environmentally friendly gases after the high-voltage switch has completed the breaking test at each breaking current, and the volume percentage of the environmentally friendly gas reduction is determined based on the content relationship between the environmentally friendly gas and the characteristic gas.

13. The system according to claim 8, characterized in that, The environmental gas decomposition amount determination unit determines the environmental gas decomposition amount corresponding to each breaking current based on the actual arc energy and the number of moles of environmental gas decomposed per unit energy corresponding to the corresponding breaking current, including: n a＝ E a *R C4 , Where, n a E represents the amount of environmentally friendly gas decomposed for any given breaking current. a R represents the actual arcing energy corresponding to any given breaking current. C4 This represents the number of moles of the environmentally friendly gas decomposed per unit energy corresponding to any given breaking current.

14. The system according to claim 8, characterized in that, The evaluation unit evaluates the electrical life of the target high-voltage switch based on the decomposition amount and the rated molar number, including: If n at / n r If n < P, then the target high-voltage switch is determined to have breaking capacity and can continue to be used; otherwise, the target high-voltage switch is determined to have no breaking capacity and has reached the end of its electrical life; where n at n represents the total amount of environmentally friendly gas decomposition. r is the rated number of moles; P is the preset threshold.

15. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the method as described in any one of claims 1-7.

16. An electronic device, characterized in that, include: The computer-readable storage medium as described in claim 15; as well as One or more processors for executing a program in the computer-readable storage medium.

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