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

Abstract

The invention discloses a high-voltage switch electrical life evaluation method and system based on an environment-friendly gas decomposition rate. The method comprises the following steps: calculating a rated mole number of environment-friendly gas in environment-friendly mixed gas; carrying out an on-off test, and calculating arcing energy corresponding to each on-off current; obtaining the reduced volume ratio of the environment-friendly gas after the on-off test of the high-voltage switch under each on-off current is finished, and obtaining the reduced mole number of the environment-friendly gas corresponding to each on-off current based on the reduced volume ratio; based on the reduced mole number and the corresponding arcing energy, determining the decomposition mole number of the environment-friendly gas corresponding to each breaking current under unit energy; acquiring actual arcing energy, determining an environment-friendly gas decomposition amount corresponding to each breaking current based on the actual arcing energy and the decomposition mole number of the environment-friendly gas corresponding to the corresponding breaking current under unit energy, and summing to determine the total environment-friendly gas decomposition amount; and evaluating the electrical life of the target high-voltage switch according to the total decomposition amount of the environment-friendly gas and the rated mole number.

Description

Technical Field

[0001] The present invention relates to the technical field of environmentally friendly gas-insulated power transmission and distribution equipment, and more specifically, to a method and system for evaluating the life of a high-voltage switch based on the decomposition rate of an environmentally friendly gas. Background Art

[0002] Sulfur hexafluoride (SF6) gas is widely used in electrical equipment as an excellent insulating and arc-extinguishing medium, but the greenhouse effect of SF6 is 24,300 times that of CO2, and its lifespan in the atmosphere is as long as 3,200 years, which has a great adverse impact on the environment. Domestic and foreign studies have shown that the mixed gas composed of environmentally friendly gases such as perfluoroisobutyronitrile (C4F7N) and trifluoromethylsulfonyl fluoride (CF3SO2F) with CO2, O2 or N2 has high insulation strength and low greenhouse effect, and is considered to be the current environmentally friendly alternative gas to SF6 with better performance. Compared with SF6, environmentally friendly gases produce high-temperature arc plasma under equipment breaking conditions, and decompose or react with each other in large quantities. The gas recombination characteristics after arc extinguishing are slightly worse, which has a great impact on large-capacity breaking capacity and electrical life. The environmentally friendly gas cannot recombine after decomposition, resulting in a decrease in content, which not only reduces the electrical life of the equipment breaking, but may even fail to meet the insulation requirements for normal operation of the equipment. Since the stability and recovery ability of environmentally friendly gases themselves are slightly insufficient, it is necessary to conduct research on the decomposition characteristics under different arc energies to determine whether the on-off life of this type of switch can meet the operating requirements during its entire life cycle.

[0003] Therefore, a method for evaluating the electrical life of high-voltage switches based on the decomposition rate of environmentally friendly gases is needed. Summary of the invention

[0004] The present invention provides a method and system for evaluating the electrical life of a high-voltage switch based on the decomposition rate of an environmentally friendly gas, so as to solve the problem of how to evaluate the life of an environmentally friendly gas high-voltage switch.

[0005] In order to solve the above problems, according to one aspect of the present invention, a method for evaluating the life of a high-voltage switch based on the decomposition rate of an environmentally friendly gas is provided, the method comprising:

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

[0007] Obtaining 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 calculating the arcing energy corresponding to each breaking current according to the arc current and arc voltage;

[0008] Obtain the volume percentage of environmental gas reduced after the breaking test of the high-voltage switch at each breaking current, and obtain the number of moles of environmental gas reduced corresponding to each breaking current based on the reduced volume percentage;

[0009] Determine the decomposition mole number of the environmental protection gas corresponding to each breaking current under unit energy based on the reduced mole number of the environmental protection gas corresponding to each breaking current and the corresponding arcing energy;

[0010] Obtaining the actual arcing energy of the target high-voltage switch filled with the environmentally friendly mixed gas after each interruption, and determining the decomposition amount of the environmentally friendly gas corresponding to each interrupting current based on the actual arcing energy and the decomposition mole number of the environmentally friendly gas corresponding to the corresponding interrupting current under unit energy, and summing them to determine the total decomposition amount of the environmentally friendly gas;

[0011] The electrical life of the target high-voltage switch is evaluated based on the total amount of decomposition of the environmentally friendly gas 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 trifluoromethylsulfonyl fluoride; the buffer gas includes: carbon dioxide, oxygen and / or nitrogen.

[0013] Preferably, the method calculates the rated mole number and the reduced mole number of the environmentally friendly gas in the following manner, including:

[0014]

[0015] Among them, n r is the rated molar number; p is the rated gas pressure; k1 is the volume ratio of the environmentally friendly gas in the environmentally friendly mixed gas; V is the volume of the high-voltage switch; n d is the number of moles of environmentally friendly gas reduced; k2 is the volume percentage of environmentally friendly gas reduced; R is the setting coefficient; T is the temperature coefficient.

[0016] Preferably, the arcing energy at each breaking current is calculated according to the arc current and the arc voltage, comprising:

[0017]

[0018] Among them, E a is the arc energy under any breaking current; n is the number of tests; u ak 、i ak and t ak They are the arc voltage, arc current and arc burning time of the kth interruption respectively.

[0019] Preferably, the step of obtaining the volume ratio of environmental gas reduced after the breaking test of the high-voltage switch at each breaking current is completed includes:

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

[0021] Preferably, the step of determining the decomposition amount of the environmental gas corresponding to each breaking current based on the actual arcing energy and the decomposition mole number of the environmental gas corresponding to the corresponding breaking current under unit energy comprises:

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

[0023] Among them, n a is the amount of environmental gas decomposition corresponding to any breaking current; E a is the actual arc energy corresponding to any breaking current; R C4 It is the number of moles of decomposition of the environmental protection gas under unit energy corresponding to any breaking current.

[0024] Preferably, the step of evaluating the electrical life of the target high-voltage switch according to the decomposition amount and the rated molar number includes:

[0025] If at / n r <P, it is determined that the target high-voltage switch has the breaking capacity and is allowed to continue to be used; otherwise, it is determined that the target high-voltage switch does not have the breaking capacity and has reached the end of its electrical life; wherein, n at is the total amount of environmental gas decomposition; n r is the rated molar number; P is the preset threshold.

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

[0027] A rated mole number calculation unit, used for calculating the rated mole number of the environmentally friendly gas in the environmentally friendly mixed gas;

[0028] An arcing energy calculation unit, 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 calculate the arcing energy corresponding to each breaking current according to the arc current and arc voltage;

[0029] A mole reduction calculation unit is used to obtain the volume percentage of environmental gas reduced after the breaking test of the high-voltage switch at each breaking current is completed, and obtain the mole reduction of environmental gas corresponding to each breaking current based on the reduced volume percentage;

[0030] A decomposition mole number calculation unit, used to determine the decomposition mole number of the environmental protection gas corresponding to each breaking current under unit energy based on the reduced mole number of the environmental protection gas corresponding to each breaking current and the corresponding arcing energy;

[0031] An environmental gas decomposition amount determination unit is used to obtain the actual arcing energy of the target high-voltage switch filled with the environmental gas mixture after each interruption, and determine the environmental gas decomposition amount corresponding to each interruption current based on the actual arcing energy and the decomposition mole number of the environmental gas corresponding to the corresponding interruption current under unit energy, and sum 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 according to the total amount of decomposition of the environmentally friendly gas 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 trifluoromethylsulfonyl 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 in the following manner, including:

[0035]

[0036] Among them, n r is the rated molar number; p is the rated gas pressure; k1 is the volume ratio of the environmentally friendly gas in the environmentally friendly mixed gas; V is the volume of the high-voltage switch; n d is the number of moles of environmentally friendly gas reduced; k2 is the volume percentage of environmentally friendly gas reduced; R is the setting coefficient; T is the temperature coefficient.

[0037] Preferably, the arcing energy calculation unit calculates the arcing energy under each breaking current according to the arc current and the arc voltage, comprising:

[0038]

[0039] Among them, E a is the arc energy under any breaking current; n is the number of tests; u ak 、i ak and t ak They are the arc voltage, arc current and arc burning time of the kth interruption respectively.

[0040] Preferably, the mole reduction calculation unit obtains the volume ratio of environmental gas reduction after the breaking test of the high-voltage switch at each breaking current, including:

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

[0042] Preferably, the environmental gas decomposition amount determining unit determines the environmental gas decomposition amount corresponding to each breaking current based on the actual arcing energy and the decomposition mole number of the environmental gas corresponding to the corresponding breaking current under unit energy, including:

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

[0044] Among them, n a is the amount of environmental gas decomposition corresponding to any breaking current; E a is the actual arc energy corresponding to any breaking current; R C4 It is the number of moles of decomposition of the environmental protection gas under unit energy corresponding to any breaking current.

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

[0046] If at / n r <P, it is determined that the target high-voltage switch has the breaking capacity and is allowed to continue to be used; otherwise, it is determined that the target high-voltage switch does not have the breaking capacity and has reached the end of its electrical life; wherein, n at is the total amount of environmental gas decomposition; n r is the rated molar number; P is the preset threshold.

[0047] Based on 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 step in a method for evaluating the life of a high-voltage switch based on the decomposition rate of an environmentally friendly gas.

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

[0049] The computer-readable storage medium described above; and

[0050] One or more processors are used to execute the program in the computer-readable storage medium.

[0051] The present invention provides a method and system for evaluating the electrical life of a high-voltage switch based on the decomposition rate of an environmentally friendly gas, comprising: calculating the rated molar number of an environmentally friendly gas in an environmentally friendly mixed gas; obtaining the arc current and arc voltage of each test after the environmentally friendly mixed gas is filled into the high-voltage switch and a breaking test is performed, and calculating the arc energy corresponding to each breaking current according to the arc current and arc voltage; obtaining the volume ratio of the environmentally friendly gas reduced after the breaking test of the high-voltage switch under each breaking current, and obtaining the reduced molar number of the environmentally friendly gas corresponding to each breaking current based on the reduced volume ratio; determining the decomposition molar number of the environmentally friendly gas corresponding to each breaking current under unit energy based on the reduced molar number of the environmentally friendly gas corresponding to each breaking current and the corresponding arc energy; obtaining the actual arc energy of the target high-voltage switch filled with the environmentally friendly mixed gas after each breaking, and determining the decomposition amount of the environmentally friendly gas corresponding to each breaking current based on the actual arc energy and the decomposition molar number of the environmentally friendly gas corresponding to the corresponding breaking current under unit energy, and summing up to determine the total amount of environmentally friendly gas decomposition; evaluating the electrical life of the target high-voltage switch according to the total amount of environmentally friendly gas decomposition and the rated molar number. The present invention can evaluate the electrical life of a high-voltage switch with high accuracy based on the decomposition amount of the environmentally friendly gas, and can provide technical support for the safe and reliable operation of the environmentally friendly gas high-voltage switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

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

[0054] Figure 2 Schematic diagram of the structure of a high-voltage switch life assessment system 200 based on environmental gas decomposition rate according to an embodiment of the present invention. DETAILED DESCRIPTION

[0055] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0056] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0057] In order to solve the problem of how to evaluate the electrical life of a high-voltage switch, the present invention carries out arc breaking tests under different currents and arcing energies based on a high-voltage switch filled with environmentally friendly gas, detects changes in the content of characteristic decomposition gas after the arc test, calculates the change in the molar number of the environmentally friendly gas and the gas decomposition rate under unit arcing energy, monitors the voltage and current signals at each opening and closing of the environmentally friendly gas high-voltage switch during operation, obtains the molar number of the environmentally friendly gas, and evaluates the electrical life of the high-voltage switch, thereby providing a reference for the normal operation of the environmentally friendly gas circuit breaker.

[0058] Figure 1 FIG. 1 is a flow chart of a method 100 for evaluating the life of a high-voltage switch based on the decomposition rate of an environmentally friendly gas according to an embodiment of the present invention. Figure 1 As shown, the method for evaluating the electrical life of a high-voltage switch based on the decomposition rate of an environmentally friendly gas provided in an embodiment of the present invention can evaluate the electrical life of a high-voltage switch with high accuracy based on the decomposition amount of the environmentally friendly gas, and can provide technical support for the safe and reliable operation of the environmentally friendly gas high-voltage switch. The method 100 for evaluating the electrical life of a high-voltage switch based on the decomposition rate of an environmentally friendly gas provided in an embodiment of the present invention starts from step 101. In step 101, the rated number of moles of the 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 trifluoromethylsulfonyl fluoride; the buffer gas includes: carbon dioxide, oxygen and / or nitrogen.

[0060] Preferably, the method calculates the nominal number of moles in the following manner, comprising:

[0061]

[0062] Among them, n r is the rated molar number; p is the rated gas pressure; k1 is the volume proportion of the environmentally friendly gas in the environmentally friendly mixed gas; V is the volume of the high-voltage switch; R is the setting coefficient; and T is the temperature coefficient.

[0063] In the present 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 trifluoromethylsulfonyl fluoride CF3SO2F); the buffer gas includes: carbon dioxide (CO2), oxygen (O2) and / or nitrogen (N2). If the rated gas pressure is p, the volume ratio of C4F7N is k1, and the volume of the high-voltage switch is V, the rated molar number n of C4F7N gas can be calculated. r for:

[0064]

[0065] Among them, 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 filled 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 arcing energy at each breaking current is calculated according to the arc current and the arc voltage, comprising:

[0068]

[0069] Among them, E a is the arc energy under any breaking current; n is the number of tests; u ak 、i ak and t ak They are the arc voltage, arc current and arc burning time of the kth interruption respectively.

[0070] In the present invention, an environmentally friendly mixed gas is filled into a high-voltage switch and a breaking test is performed to obtain the arc current and arc voltage of each test, and the arc energy corresponding to each breaking current is calculated based on the arc current and arc voltage.

[0071] Taking C4F7N as an environmental gas, the mixed environmental gas is filled into high-voltage switches such as circuit breakers with a rated voltage of 126kV and above, and a breaking test with a current of 20kA to 63kA is carried out in accordance with the requirements of GB 1984-2014 "High Voltage AC Circuit Breakers". The number of breaking times under each current is not less than 20 times. Install arc voltage and arc current monitoring sensor modules on the high-voltage switch to record the arc voltage u each time the switch is broken. a , arc current i a Waveform, arcing time t a is the duration of the arc current, and is substituted into formula (2) to calculate the arc energy E per interruption. a . Among them, each breaking current I b Arc energy Ea for:

[0072]

[0073] Where n is the number of tests for each breaking current, u ak 、i ak ,t ak They are respectively the arc voltage and arc current waveforms of the kth interruption, and the arc burning time of the arc.

[0074] In step 103, the volume percentage of the environmental gas reduced after the breaking test of the high-voltage switch at each breaking current is obtained, and the number of moles of the environmental gas reduced corresponding to each breaking current is obtained based on the reduced volume percentage.

[0075] Preferably, the step of obtaining the volume ratio of environmental gas reduced after the breaking test of the high-voltage switch at each breaking current is completed includes:

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

[0077] Preferably, the method calculates the reduced number of moles of environmentally friendly gas in the following manner, including:

[0078]

[0079] Among them, n d is the number of moles of environmental gas reduced; p is the rated gas pressure; V is the volume of the high-voltage switch; k2 is the volume percentage of the environmental gas reduced; R is the setting coefficient; T is the temperature coefficient.

[0080] In the present invention, gas chromatography or gas chromatography-mass spectrometry is used to detect the content of characteristic gas obtained by decomposing environmental gas after the breaking test of the high-voltage switch at each breaking current, and according to the content relationship between the environmental gas and the characteristic gas, the volume percentage of the environmental gas reduction is determined, and the number of moles of environmental gas reduction corresponding to each breaking current is obtained based on the reduced volume percentage. d .

[0081] Continuing to take C4F7N as an environmentally friendly gas, gas chromatography or gas chromatography-mass spectrometry is used to detect the high-voltage switch at each I b The characteristic gas CF4 gas content c in the environmental gas after the next interruption n times f According to the relationship between the decomposition of C4F7N and the generation of characteristic gas CF4, the volume percentage k of C4F7N reduction is obtained. d7 / 4c f , and then substitute Calculate and get the number of moles of C4F7N gas reduced n d Among them, the relationship between C4F7N and the characteristic gas CF4 produced by decomposition is:

[0082]

[0083] In step 104, the decomposition mole number of the environmental gas corresponding to each interrupting current under unit energy is determined based on the reduced mole number of the environmental gas corresponding to each interrupting current and the corresponding arcing energy.

[0084] In the present invention, for any breaking current, based on the corresponding reduction in molar number n b and arc energy E a The ratio of the breaking current to the decomposition mole number R of the environmental gas under unit energy corresponding to any 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 disconnection is obtained, and based on the actual arcing energy and the decomposition molar number of the environmentally friendly gas corresponding to the corresponding disconnecting current under unit energy, the decomposition amount of the environmentally friendly gas corresponding to each disconnecting current is determined, and the total amount of environmentally friendly gas decomposition is determined by summing up.

[0086] Preferably, the step of determining the decomposition amount of the environmental gas corresponding to each breaking current based on the actual arcing energy and the decomposition mole number of the environmental gas corresponding to the corresponding breaking current under unit energy comprises:

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

[0088] Among them, n a is the amount of environmental gas decomposition corresponding to any breaking current; E a is the actual arc energy corresponding to any breaking current; R C4 It is the number of moles of decomposition of the environmental protection gas under unit energy corresponding to any breaking current.

[0089] In the present invention, 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 each time the switch is opened and closed. a , arc current i a Waveform, arcing time t a is the duration of the arc current, and calculates the actual arc energy E for each interruption a Based on the actual arc energy E aThe number of moles of decomposition of environmental gas per unit energy corresponding to the corresponding breaking current R C4 , using the formula n a＝ E a *R C4 Determine the amount of environmental gas decomposition n corresponding to each breaking current a , and calculate the total amount of environmental gas decomposition after multiple interruptions n at .

[0090] In step 106, the electrical life of the target high-voltage switch is evaluated according to the total amount of decomposed environmental gas and the rated molar number.

[0091] Preferably, the step of evaluating the electrical life of the target high-voltage switch according to the decomposition amount and the rated molar number includes:

[0092] If at / n r <P, it is determined that the target high-voltage switch has the breaking capacity and is allowed to continue to be used; otherwise, it is determined that the target high-voltage switch does not have the breaking capacity and has reached the end of its electrical life; wherein, n at is the total amount of environmental gas decomposition; n r is the rated molar number; P is the preset threshold.

[0093] In the present invention, P can be taken as 10%. at / n r If the value is less than 10%, it indicates that the environmentally friendly gas high-voltage switch still has the breaking capacity and is allowed to 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 withdrawn from use.

[0094] The present invention takes an environmentally friendly mixed gas containing environmentally friendly gas C4F7N as an example. First, a breaking test under different currents and arcing energies is carried out on an environmentally friendly mixed gas high-voltage switch with a determined volume proportion of C4F7N. The decomposition mole number of C4F7N is obtained by detecting the content of characteristic decomposition gas CF4. Then, the arc voltage and arc current waveforms of the environmentally friendly gas high-voltage switch when the switch is broken are monitored in real time. The decomposition mole number of C4F7N at each breaking is analyzed. The ratio of the accumulated decomposition mole number of C4F7N to the rated mole number is used to evaluate whether the electrical life of the high-voltage switch has ended, thereby ensuring the safe and reliable operation of the C4F7N environmentally friendly gas high-voltage switch.

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

[0096] Preferably, the rated mole number calculation unit 201 is used to calculate the rated mole number of the 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 trifluoromethylsulfonyl 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 filled into the high-voltage switch and the breaking test is performed, and calculate the arc energy corresponding to each breaking current based on the arc current and arc voltage.

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

[0100]

[0101] Among them, E a is the arc energy under any breaking current; n is the number of tests; u ak 、i ak and t ak They are the arc voltage, arc current and arc burning time of the kth interruption respectively.

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

[0103] Preferably, the reduced mole number calculation unit 203 obtains the volume ratio of the environmental gas reduced after the breaking test of the high-voltage switch at each breaking current, including:

[0104] Gas chromatography or gas chromatography-mass spectrometry is used to detect the content of characteristic gas obtained by decomposing environmentally friendly gas after the breaking test of the high-voltage switch at each breaking current, and the volume percentage of the reduced environmentally friendly gas 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, including:

[0106]

[0107] Among them, n r is the rated molar number; p is the rated gas pressure; k1 is the volume ratio of the environmentally friendly gas in the environmentally friendly mixed gas; V is the volume of the high-voltage switch; n d is the number of moles of environmentally friendly gas reduced; k2 is the volume percentage of environmentally friendly gas reduced; R is the setting coefficient; T is the temperature coefficient.

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

[0109] Preferably, the environmental gas decomposition amount determination unit 205 is used to obtain the actual arcing energy of the target high-voltage switch filled with the environmentally friendly mixed gas after each disconnection, and based on the actual arcing energy and the decomposition molar number of the environmental gas corresponding to the corresponding disconnecting current under unit energy, determine the environmental gas decomposition amount corresponding to each disconnecting current, and sum up to determine the total amount of environmental gas decomposition.

[0110] Preferably, the environmental gas decomposition amount determining unit 205 determines the environmental gas decomposition amount corresponding to each breaking current based on the actual arcing energy and the decomposition mole number of the environmental gas corresponding to the corresponding breaking current under unit energy, and determines the environmental gas decomposition amount corresponding to each breaking current, including:

[0111] n a＝ E a *R C4 ,

[0112] Among them, n a is the amount of environmental gas decomposition corresponding to any breaking current; E a is the actual arc energy corresponding to any breaking current; R C4 It is the number of moles of decomposition of the environmental protection gas under unit energy corresponding to any breaking current.

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

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

[0115] If at / n r <P, it is determined that the target high-voltage switch has the breaking capacity and is allowed to continue to be used; otherwise, it is determined that the target high-voltage switch does not have the breaking capacity and has reached the end of its electrical life; wherein, n at is the total amount of environmental gas decomposition; n r is the rated molar number; P is the preset threshold.

[0116] The high-voltage switch life assessment system 200 based on the environmental gas decomposition rate of the embodiment of the present invention corresponds to the high-voltage switch life assessment method 100 based on the environmental gas decomposition rate of another embodiment of the present invention, which will not be repeated here.

[0117] Based on 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 step in a method for evaluating the life of a high-voltage switch based on the decomposition rate of an environmentally friendly gas.

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

[0119] The computer-readable storage medium described above; and

[0120] One or more processors are used to execute the program in the computer-readable storage medium.

[0121] The invention has been described above with reference to a few embodiments. However, it is readily apparent to a person skilled in the art that other embodiments than the ones disclosed above are equally within the scope of the invention, as defined by the appended patent claims.

[0122] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise therein. All references to "a / said / the [means, components, etc.]" are to be openly interpreted as at least one instance of said means, components, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not necessarily have to be performed in the exact order disclosed, unless explicitly stated otherwise.

[0123] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented 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] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks 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 produce 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.

[0125] 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.

[0126] 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.

[0127] 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. A method for evaluating the life of a high-voltage switch based on the decomposition rate of an environmentally friendly gas, characterized in that: The method comprises: Calculate the rated number of moles of environmentally friendly gas in the environmentally friendly mixed gas; Obtaining 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 calculating the arcing energy corresponding to each breaking current according to the arc current and arc voltage; Obtain the volume percentage of environmental gas reduced after the breaking test of the high-voltage switch at each breaking current, and obtain the number of moles of environmental gas reduced corresponding to each breaking current based on the reduced volume percentage; Determine the decomposition mole number of the environmental protection gas corresponding to each breaking current under unit energy based on the reduced mole number of the environmental protection gas corresponding to each breaking current and the corresponding arcing energy; Obtaining the actual arcing energy of the target high-voltage switch filled with the environmentally friendly mixed gas after each interruption, and determining the decomposition amount of the environmentally friendly gas corresponding to each interrupting current based on the actual arcing energy and the decomposition mole number of the environmentally friendly gas corresponding to the corresponding interrupting current under unit energy, and summing them to determine the total decomposition amount of the environmentally friendly gas; The electrical life of the target high-voltage switch is evaluated based on the total amount of decomposition of the environmentally friendly gas and the rated molar number.

2. The method according to claim 1, characterized in that The environmentally friendly mixed gas is composed of an environmentally friendly gas and a buffer gas; the environmentally friendly gas includes: perfluoroisobutyronitrile or trifluoromethylsulfonyl 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 nominal mole number and the reduced mole number of the environmentally friendly gas in the following manner, including: Among them, n r is the rated molar number; p is the rated gas pressure; k1 is the volume ratio of the environmentally friendly gas in the environmentally friendly mixed gas; V is the volume of the high-voltage switch; n d is the number of moles of environmentally friendly gas reduced; k2 is the volume percentage of environmentally friendly gas reduced; R is the setting coefficient; T is the temperature coefficient.

4. The method according to claim 1, characterized in that: The arcing energy at each breaking current is calculated according to the arc current and the arc voltage, including: Among them, E a is the arc energy under any breaking current; n is the number of tests; u ak 、i ak and t ak They are the arc voltage, arc current and arc burning time of the kth interruption respectively.

5. The method according to claim 1, characterized in that The method of obtaining the volume ratio of environmental gas reduced after the breaking test of the high-voltage switch at each breaking current is completed includes: Gas chromatography or gas chromatography-mass spectrometry is used to detect the content of characteristic gas obtained by decomposing environmentally friendly gas after the breaking test of the high-voltage switch at each breaking current, and the volume percentage of the reduced environmentally friendly gas 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 step of determining the decomposition amount of the environmental gas corresponding to each breaking current based on the actual arcing energy and the decomposition mole number of the environmental gas corresponding to the corresponding breaking current under unit energy comprises: n a＝ E a *R C4 , Among them, n a is the amount of environmental gas decomposition corresponding to any breaking current; E a is the actual arc energy corresponding to any breaking current; R C4 It is the number of moles of decomposition of the environmental protection gas under unit energy corresponding to any breaking current.

7. The method according to claim 1, characterized in that The evaluating the electrical life of the target high-voltage switch according to the decomposition amount and the rated molar number includes: If at / n r <P, it is determined that the target high-voltage switch has the breaking capacity and is allowed to continue to be used; otherwise, it is determined that the target high-voltage switch does not have the breaking capacity and has reached the end of its electrical life; wherein, n at is the total amount of environmental gas decomposition; n r is the rated molar number; P is the preset threshold.

8. A high-voltage switch life assessment system based on environmental gas decomposition rate, characterized in that: The system comprises: A rated mole number calculation unit, used for calculating the rated mole number of the environmentally friendly gas in the environmentally friendly mixed gas; An arcing energy calculation unit, 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 calculate the arcing energy corresponding to each breaking current according to the arc current and arc voltage; A mole reduction calculation unit is used to obtain the volume percentage of environmental gas reduced after the breaking test of the high-voltage switch at each breaking current is completed, and obtain the mole reduction of environmental gas corresponding to each breaking current based on the reduced volume percentage; A decomposition mole number calculation unit, used to determine the decomposition mole number of the environmental protection gas corresponding to each breaking current under unit energy based on the reduced mole number of the environmental protection gas corresponding to each breaking current and the corresponding arcing energy; An environmental gas decomposition amount determination unit is used to obtain the actual arcing energy of the target high-voltage switch filled with the environmental gas mixture after each interruption, and determine the environmental gas decomposition amount corresponding to each interruption current based on the actual arcing energy and the decomposition mole number of the environmental gas corresponding to the corresponding interruption current under unit energy, and sum 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 according to the total amount of decomposition of the environmentally friendly gas and the rated molar number.

9. The system according to claim 8, characterized in that The environmentally friendly mixed gas is composed of an environmentally friendly gas and a buffer gas; the environmentally friendly gas includes: perfluoroisobutyronitrile or trifluoromethylsulfonyl 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 in the following manner, including: Among them, n r is the rated molar number; p is the rated gas pressure; k1 is the volume ratio of the environmentally friendly gas in the environmentally friendly mixed gas; V is the volume of the high-voltage switch; n d is the number of moles of environmentally friendly gas reduced; k2 is the volume percentage of environmentally friendly gas reduced; R is the setting coefficient; T is the temperature coefficient.

11. The system according to claim 8, characterized in that The arcing energy calculation unit calculates the arcing energy under each breaking current according to the arc current and the arc voltage, including: Among them, E a is the arc energy under any breaking current; n is the number of tests; u ak 、i ak and t ak They are the arc voltage, arc current and arc burning time of the kth interruption respectively.

12. The system according to claim 8, characterized in that The mole reduction calculation unit obtains the volume ratio of environmental gas reduction after the high-voltage switch breaks the test at each breaking current, including: Gas chromatography or gas chromatography-mass spectrometry is used to detect the content of characteristic gas obtained by decomposing environmentally friendly gas after the breaking test of the high-voltage switch at each breaking current, and the volume percentage of the reduced environmentally friendly gas 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 arcing energy and the decomposition mole number of the environmental gas corresponding to the corresponding breaking current under unit energy, including: n a＝ E a *R C4 , Among them, n a is the amount of environmental gas decomposition corresponding to any breaking current; E a is the actual arc energy corresponding to any breaking current; R C4 It is the number of moles of decomposition of the environmental protection gas under unit energy corresponding to any 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 according to the decomposition amount and the rated molar number, including: If at / n r <P, it is determined that the target high-voltage switch has the breaking capacity and is allowed to continue to be used; otherwise, it is determined that the target high-voltage switch does not have the breaking capacity and has reached the end of its electrical life; wherein, n at is the total amount of environmental gas decomposition; n r is the rated molar number; 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 a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

16. An electronic device, characterized in that: include: The computer readable storage medium as claimed in claim 15; as well as One or more processors are used to execute the program in the computer-readable storage medium.

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