CN117723916A - GIT application-oriented environment-friendly insulating gas electrical stability evaluation device and method - Google Patents
GIT application-oriented environment-friendly insulating gas electrical stability evaluation device and method Download PDFInfo
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Abstract
The invention discloses an environment-friendly insulating gas electrical stability assessment device and method for GIT application. The device comprises a tank body and a physical model for simulating typical defects in the GIT, and the device can be used for carrying out an environmental protection insulating gas GIT electrical stability evaluation test. The evaluation method comprises the following steps: discharge test, which is to perform three discharge tests of low energy, high energy and flashover; the method comprises the steps of evaluating reference data acquisition, wherein the reference data acquisition comprises three data types, namely a discharge characteristic parameter, a gas decomposition component characteristic parameter and a material performance change characterization parameter in a GIT; and carrying out comprehensive quantitative evaluation to obtain an electrical stability index applied in the environment-friendly insulating gas GIT. The invention can further explore the applicability of various environment-friendly insulating gases to the GIT for the development of the GIT, and provides technical guidance for the evaluation of the electrical stability of the GIT adopting the environment-friendly insulating gases in operation and maintenance.
Description
Technical Field
The invention relates to the technical field of electrical equipment of insulating gas, in particular to an environment-friendly insulating gas electrical stability assessment device and method for GIT application.
Background
Gaseous insulating media are becoming more and more widely used. Self sulfur hexafluoride (SF) 6 ) Since the advent of gas, the gas has been reused in a wide variety of electrical devices today because of its excellent insulating and arc extinguishing properties and stable physicochemical properties, and has played an important role in insulating and arc extinguishing. In recent years, C 4 F 7 N、C 5 F 10 A series of environment-friendly insulating gases represented by O and the like enter the field of view of researchers, and the good performance of the environment-friendly insulating gases on environment protection and insulation allows us to see SF 6 Alternative possibilities are possible.
Gas-insulated power transmission and distribution equipment (GIE) represented by gas-insulated transformers (Gas Insulated Transformer, GIT), mainly using SF 6 The gas is used as an insulating arc extinguishing medium, and has the characteristics of small occupied area, strong external interference resistance, good electric energy quality and the like. The GIT fully plays the advantage of gas insulation, plays an important role in multiple voltage classes and multiple power transformation scenes, has a trend of gradually replacing the oil-immersed transformer at present, and is wider in application.
However, in actual operation of the GIT, a discharge fault often occurs, and the occurrence frequency thereof has a large specific gravity accounting for the total number of faults, and becomes a main fault which causes abnormal operation and insulation defects of the GIT, and even causes dielectric breakdown to completely lose insulation performance when severe, thereby causing serious influence on safe and stable operation of the GIT. Particularly for the novel environment-friendly insulating gas, the prior researches show that the environment-friendly insulating gas can be decomposed under the discharge fault to cause the overall reduction of the insulating property, and the self-recovery performance is poor and cannot be like SF 6 The self-restorability of the gas can still restore and keep the insulation level stable within a period of time after discharge, and under the serious discharge fault, the condition that insulation is gradually deteriorated until the insulation performance is completely lost due to the continuous decomposition of the environment-friendly insulation gas can occur, so that the gas has important engineering significance to the research on the development of the electrical stability of the environment-friendly insulation gas applied to the GIT. And in view of the fact that some special materials and structures are used in the GIT, such as the fact that the GIT often employs a polyethylene terephthalate (PET) film as its winding insulation material and the like,the internal discharge condition is complicated, and the research on the discharge characteristics of the environment-friendly insulating gas, which is carried out at present, is not completely applicable to the environment-friendly insulating gas.
Therefore, it is necessary to provide a device and a method for evaluating the electrical stability of the environment-friendly insulating gas for the GIT application, to develop a test on the environment-friendly insulating gas, to explore the stability of the environment-friendly insulating gas in the GIT application when the environment-friendly insulating gas encounters a discharge fault and evaluate the stability, to further explore the applicability of various environment-friendly insulating gases to the environment-friendly insulating gas for the development of the GIT, and to provide technical guidance for evaluating the electrical stability performance of the GIT adopting the environment-friendly insulating gas in operation and maintenance.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide an evaluation device and an evaluation method for the electrical stability of the environment-friendly insulating gas for GIT application, which simulate the development test of a GIT internal structure construction feature device model, can synthesize multiple types of test data of multiple discharge conditions to evaluate the electrical stability of the environment-friendly insulating gas applied in the GIT and provide an electrical stability index as an evaluation result, further explore the applicability of various environment-friendly insulating gases for the development of the GIT, and provide technical guidance for the evaluation of the electrical stability of the GIT adopting the environment-friendly insulating gas in operation maintenance.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
in a first aspect, the present invention provides a GIT application oriented environment-friendly insulating gas electrical stability assessment apparatus, comprising a tank and a physical model of a typical defect in a simulated GIT disposed in the tank;
the tank body is a sealed tank body and is provided with an air inlet and an air outlet;
the typical defect physical model in the simulated GIT comprises a discharge four-needle electrode model, a gas-solid surface flashover discharge model and a winding turn-to-turn discharge model;
the discharging four-needle electrode model comprises a flat electrode and four-needle electrodes perpendicular to the flat electrode;
the gas-solid surface flashover discharge model comprises a needle electrode, an insulating plate and a plate electrode; the insulating plate is arranged on the flat electrode, and the pin electrode is perpendicular to the flat electrode and is positioned on one side of the insulating plate;
the winding turn-to-turn discharge model comprises a first conductive rod and a second conductive rod; the two conductive rods are wrapped with GIT film materials and are vertically arranged in parallel, penetrate out of the side wall of the tank body and are subjected to sealing treatment;
the stability assessment device performs different tests by selecting the typical defect physical model in different simulated GITs.
Further, the tank body is a tank body with a cover, and the cover is provided with an air inlet and an air outlet and is connected with a conduit.
Further, in the discharging four-needle electrode model, the four-needle electrode is of a claw-shaped structure, and the upper end of the four-needle electrode is connected with the tank body through a fixing rod; the plate electrode is connected with the tank body through a fixed rod.
Further, in the gas-solid surface flashover discharge model, the lower end of the needle electrode is a tip, the upper end is in diameter-variable smooth transition to the lower end, and the needle electrode is connected to the tank body through a fixing rod; the plate electrode is connected with the tank body through a fixed rod.
Further, in the winding turn-to-turn discharge model, the conducting rods are square copper wires, vertical projection parts of the first conducting rods and the second conducting rods are overlapped, and the first conducting rods and the second conducting rods penetrate out of two sides of the tank body respectively.
Further, in the gas-solid surface flashover discharge model, the insulating plate is a polyethylene terephthalate film or an insulating paperboard; in the winding turn-to-turn discharge model, the GIT film material is polyethylene terephthalate.
Further, a voltage is applied to the electrodes to perform the test.
Further, the environment-friendly insulating gas includes: conventional gases, e.g. N 2 、CO 2 And dry air, etc.; SF (sulfur hexafluoride) 6 Mixed gases, e.g. SF 6 Respectively with N 2 、CO 2 Mixing the gases; perfluorocarbon gases (PFCs), e.g. CF 4 、C 2 F 6 、C 3 F 8 And octafluorocyclobutane (C-C) 4 F 8 ) Etc.; strong electronegative gases, e.g. trifluoroiodomethane (CF) 3 I) C in fluorinated nitriles (PFNs) 4 F 7 N, fluorineC in the formation of ketones (PFKs) 5 F 10 O and C 6 F 12 O and Hydrofluoroolefins (HFOs), and the like.
In a second aspect, the present invention provides a method for evaluating the electrical stability of an environmentally friendly insulating gas using the apparatus of the first aspect, comprising the steps of:
(1) Discharge test: performing discharge tests on the environment-friendly insulating gas by using an environment-friendly insulating gas electrical stability evaluation device facing GIT application, wherein the discharge tests comprise a low-energy discharge test, a high-energy discharge test and a flashover discharge test, and different external voltages are applied in the test process;
(2) Evaluation reference data acquisition: the physical and chemical characteristic parameters of each test are respectively obtained and used as evaluation reference data, and the characteristic parameters comprise three types: the discharge characteristic parameters, the gas decomposition component characteristic parameters and the material performance change characterization parameters in the GIT comprehensively reflect the discharge severity and the influence of the discharge faults on the internal operation condition of the GIT from the direct condition of the discharge faults, the environment-friendly insulating gas decomposition condition and the material characteristics of the GIT respectively;
(3) Carrying out comprehensive quantitative evaluation to obtain an electrical stability index applied in the environment-friendly insulating gas GIT: and comprehensively evaluating the reference data, gradually giving corresponding weights class by class for weighting calculation integration, and finally obtaining the electrical stability index of the environment-friendly insulating gas for GIT application.
Further, in the step (1), a low-energy discharge test is used for the partial discharge test, a high-energy discharge test is used for the arc discharge test, and each type of discharge test hasGroup test (S)/(S)>Determining according to the number of the set externally applied voltage test conditions;
the low-energy discharge test is carried out on a metal material and an insulating material in the GIT; carrying out a discharge test on the metal material in the GIT by adopting a four-needle plate electrode model; carrying out a GIT internal insulation material discharge test by adopting a winding turn-to-turn discharge model;
the high-energy discharge test is carried out on a metal material and an insulating material in the GIT; carrying out a discharge test on the metal material in the GIT by adopting a four-needle plate electrode model; carrying out a GIT internal insulation material discharge test by adopting a winding turn-to-turn discharge model;
the flashover discharge test is carried out by adopting a gas-solid surface flashover discharge model, and high voltage is applied to two ends of the model to trigger the surface flashover.
Further, in the step (2),
establishing a set for discharge characteristic parameter classesThe discharge characteristic parameter class comprises parameter items +.>Respectively, a starting discharge voltage, a breakdown voltage, a discharge energy, a discharge frequency and a discharge maximum amplitude, namely, a set +.>There are a total of 5 elements,；
establishing a set for characteristic parameter classes of gas decomposition components The characteristic parameters of the gas decomposition component comprise the parameter item +.>For the various characteristic gas decomposition components of the tested environment-friendly insulating gas, which characterize the severity of the discharge fault, the set +.>The number of the elements is determined according to the discharge decomposition characteristics of the tested environment-friendly insulating gas, and the aggregate is taken>The element is->And if it is, then；
Establishing a set for the characterization parameter class of the material performance change in the GITThe characteristic parameter class of the material property change in the GIT comprises a parameter item +.>The severity of discharge trace on the surface of the metal material, the degree of deterioration of the insulating material, the solids precipitation, i.e., the set +.>There are 3 elements in total->。
Further, the step (3) includes the substeps of:
performing first-stage weighting on each sub-item data in each of three types of evaluation reference data under different externally applied voltage test conditions applied to each type of discharge test: performing first-stage first-class weighting on each discharge characteristic parameter, and endowing corresponding weights of the first-stage first class to obtain a discharge characteristic index under the test condition; performing first-stage second-class weighting on each characteristic parameter of the gas decomposition component, and endowing the first-stage second-class with corresponding weight to obtain a characteristic index of the gas decomposition component under the test condition; performing first-stage third-class weighting on the characteristic parameters of the material performance change in each GIT, and endowing the corresponding weights of the first-stage third class to obtain characteristic indexes of the material performance change in the GIT under the test condition;
Performing second-stage weighting on various characteristic indexes of three types of evaluation reference data under different applied voltage test conditions applied to various types of discharge tests: respectively giving corresponding weights of a second stage to the discharge characteristic index, the gas decomposition component characteristic index and the material performance change characteristic index in the GIT under the test condition to obtain a discharge evaluation reference index under the test condition;
performing third-stage weighting on discharge evaluation reference indexes of each type of discharge test under the condition of applying different externally applied voltages, and endowing the third stage with corresponding weight to obtain comprehensive discharge indexes of each type of discharge test;
and carrying out fourth-stage weighting on the comprehensive discharge indexes of all types of discharge tests, and endowing the fourth-stage with corresponding weights to obtain the electrical stability index of the environment-friendly insulating gas applied to the GIT.
Still further, in the substep of step (3):
the first stage of weighting is applied with different voltages in each discharge typeIn the group test, the firstData obtained by the set of applied voltage condition tests are endowed with various discharge characteristic parameters +.>First-level first-class weight->Weight satisfies->；
For partial discharge test, the sum of the initial discharge voltage and the breakdown voltage is 0.8, and the sum of the weights of the residual parameters is 0.2;
Wherein the initial discharge voltage parameter weight is taken asThe breakdown voltage parameter weight is obtained by subtracting the initial discharge voltage parameter weight from 0.8; the discharge maximum amplitude weight is taken asThe method comprises the steps of carrying out a first treatment on the surface of the The discharge frequency weight can be +.>；
Aiming at an arc discharge test and a flashover discharge test, the initial discharge voltage and the breakdown voltage discharge characteristic parameter weight are sequentially 0.2 and 0.8;
obtaining the discharge characteristic index under the test condition；
The first-stage second-class weighting gives each gas decomposition component characteristic parameterFirst-level second-class weights->Weight satisfies->The method comprises the steps of carrying out a first treatment on the surface of the The selected characteristic gas is divided into representative gas and other gas, and the total ratio of representative gas is determined to be +.>For each gas weight assignment in the representative gas class, the weight of the most representative gas is taken as +.>The rest representative gases distribute the rest weight values according to the content orders; for other gases, carrying out weight assignment according to the content proportion of the gases in the other gases; the most representative gas is the gas with the largest content increase when the discharge severity is increased in the characteristic gas decomposition component, or the gas generated when the discharge is most serious, so that the severity of faults can be reflected to the greatest extent;
Obtaining the characteristic index of the gas decomposition component under the test condition；
The first level third class weighting gives the material property change in each GITCharacterization parametersFirst-level third class weight->Weight satisfies->The method comprises the steps of carrying out a first treatment on the surface of the The weight of parameters of the severity degree of discharge trace and the solid precipitation amount of the surface of the metal material is 0.6 and 0.4 in sequence for the partial discharge test; aiming at an arc discharge test and a flashover discharge test, the surface discharge trace severity of the metal material, the degradation degree of the insulating material and the parameter weight of the solid precipitation amount are 0.4, 0.4 and 0.2 in sequence;
obtaining characteristic index of material property change in GIT under the test condition；
The second stage weighting is to apply voltages different from each discharge typeGroup test for the +.>Three types of characteristic indexes obtained by the group external voltage condition test: discharge characteristic index->Characteristic index of gas decomposition component->And a characteristic index of variation in material properties within the GIT +.>Second-level weights are respectively given +.>、/>And->The weight satisfies；/>、/>And->Sequentially 0.3, 0.3 and 0.4;
obtaining a discharge evaluation reference index under the test conditions；
The third stage weighting is used for respectively giving different applied voltages to each discharge typeDischarge evaluation reference index of group test +. >Third level weight->Wherein->Weight satisfies->；
According to the gradient of the applied voltage value, selecting weight according to the corresponding proportion to obtain the comprehensive discharge index of each type of discharge testWherein->Representing dischargeTest type->；
The fourth-stage weighting is respectively endowed with comprehensive discharge indexes of various types of discharge testsFourth level weight->Weight satisfies->The method comprises the steps of carrying out a first treatment on the surface of the Wherein the comprehensive discharge index weights under the low-energy, high-energy and flashover discharge tests are 0.2, 0.4 and 0.4 in sequence, and the electrical stability index +.>。
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a GIT application-oriented evaluation device and a GIT application-oriented evaluation method for the electrical stability of environment-friendly insulating gas, which are used for simulating a GIT internal structure construction feature device model to carry out a test, and fully consider some special materials and complex structures used in the GIT, and the prior research on the discharge characteristics of the environment-friendly insulating gas is not carried out, so that the test model is not fully applicable to the evaluation of the discharge performance of the environment-friendly insulating gas in the GIT. Therefore, the evaluation device and the evaluation method for the electrical stability of the environment-friendly insulating gas applied to the GIT can solve the problems, can integrate multiple types of test data of multiple discharge conditions to evaluate the electrical stability of the environment-friendly insulating gas applied to the GIT and provide an electrical stability index as an evaluation result, further explore the applicability of various environment-friendly insulating gases to the GIT for the development of the GIT, and provide technical guidance for evaluating the electrical stability of the GIT adopting the environment-friendly insulating gas in operation and maintenance.
Drawings
FIG. 1 is a schematic view of a gas discharge platform comprising a stainless steel tank and its components according to the present invention;
FIG. 2 is a schematic diagram of a four-needle electrode model structure in the invention;
FIG. 3 is a schematic diagram of a gas-solid surface flashover discharge model according to the present invention;
FIG. 4 is a schematic diagram of a winding turn-to-turn discharge model structure in the invention;
FIG. 5 is a schematic flow chart of the GIT application-oriented environment-friendly insulating gas electrical stability evaluation method in the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
Example 1
Fig. 1 shows a structure of an evaluation apparatus for electrical stability of an environment-friendly insulating gas for GIT application, comprising:
a tank 1 and a typical defect physical model in a simulated GIT arranged in the tank;
the tank body 1 is a sealed tank body and is provided with an air inlet and an air outlet;
The typical defect physical model in the simulated GIT includes a discharge four-needle electrode model, as shown in fig. 2; a gas-solid surface flashover discharge model, as shown in fig. 3; and a winding inter-turn discharge model, as shown in fig. 4.
The discharge four-needle electrode model comprises a flat plate electrode 12 and four-needle electrodes 11 perpendicular to the flat plate electrode 12;
the gas-solid surface flashover discharge model comprises a needle electrode 14, an insulating plate 15 and a flat plate electrode 12; the insulating plate 15 is arranged on the flat electrode 12, the needle electrode 14 is perpendicular to the flat electrode 12, and is positioned on one side of the insulating plate 15;
the winding turn-to-turn discharge model comprises a first conductive rod and a second conductive rod; the two conductive rods are wrapped with GIT film materials 10 and are vertically arranged in parallel, penetrate out of the side wall of the tank body 1 and are subjected to sealing treatment;
the stability assessment device performs different tests by selecting the typical defect physical model in different simulated GITs.
As a specific implementation mode, the tank body 1 is a tank body with a cover, an air inlet and an air outlet are arranged on the cover and connected with an air duct 5, and a knob-equipped air valve 6 is arranged on the air duct 5; the tank body 1 is fixed by a hexagon bolt 2 and a nut 4, and is sealed by a gasket 3 and a sealing piece 7.
As a specific implementation manner, in the discharging four-needle electrode model, the four-needle electrode is in a claw structure, the upper end of the four-needle electrode is connected to the upper end of the tank body 1 through a fixing rod 13, the fixing rod 13 penetrates through the upper cover, and the penetrating part is sleeved with an insulating sleeve 8; the plate electrode 12 is connected to the lower end of the can 1 through a fixing rod 13.
As an improved embodiment, in the discharge four-needle electrode model, the diameter of each needle electrode is 0.9mm, and the distance between the lowest end of the needle electrode and the flat plate electrode is 10mm; the four-needle electrode and the flat plate electrode are made of silicon steel and copper respectively, and the fixing rod is made of stainless steel.
As a specific implementation mode, in the gas-solid surface flashover discharge model, the lower end of the needle electrode 14 is a tip, the upper end is in diameter-variable smooth transition to the lower end, the needle electrode 14 is connected to the upper end of the tank body through the fixing rod 13, the fixing rod 13 penetrates out of the upper cover, and the penetrating part is sleeved with the insulating sleeve 8; the plate electrode 12 is connected to the can 1 by a fixing rod.
As an improved embodiment, in the gas-solid surface flashover discharge model, the needle electrode is made of copper, the diameter of the upper end is 10mm, the lowest end is made into a tip with a curvature radius of about 0.15mm, and a transition step is designed in the middle for smoothly transiting the diameter change of the upper end and the lower end of the needle electrode, and the diameter is 5mm. The distance between the lowest end of the needle electrode and the upper surface of the solid insulating material in the GIT is 0.5mm.
In a specific embodiment, in the winding turn-to-turn discharge model, the conducting rod 9 is a square copper wire, vertical projection parts of the first conducting rod and the second conducting rod are overlapped, and respectively penetrate out from two sides of the tank body 1, and the penetrating parts are sleeved with the insulating sleeve 8.
As an improved embodiment, in the winding inter-turn discharge model, the conductive rod 9 has a size of 2.2mm10mm, wherein the distance between the two conductive rods is 1mm, and the vertical projection superposition length is 100mm; the GIT film material compactly wraps the conductive rod, and the wrapping thickness is 0.5mm.
As a specific embodiment, in the gas-solid surface flashover discharge model, the insulating plate is composed of a polyethylene terephthalate film or an insulating paperboard; the method comprises the following steps: 10 layers of polyethylene terephthalate (PET) films with the thickness of 0.05mm are stacked on the flat plate electrode, or insulating paper boards are made into 4mm thick and placed on the flat plate electrode, and the outer PET films are connected with a stainless steel tank body to be reliably grounded. And simulating winding turn structures in the GIT by using the upper and lower conducting rods and the PET film structure model.
As a specific embodiment, in the winding turn-to-turn discharge model, the GIT film material is a polyethylene terephthalate (PET) film material.
As a specific embodiment, a voltage is applied to the electrodes to perform the test.
Example 2
The embodiment provides a method for evaluating the electrical stability of an environment-friendly insulating gas applied to a GIT by using the device of embodiment 1, as shown in fig. 5, which comprises the following specific steps:
S1, discharge test: carrying out discharge tests on the environment-friendly insulating gas by using the GIT application-oriented environment-friendly insulating gas electrical stability evaluation device and a series of discharge defect models reflecting the internal structure of the GIT, wherein the discharge tests mainly comprise a low-energy discharge test, a high-energy discharge test and a flashover discharge test, and the test conditions of different applied voltages applied by various types of discharge tests are considered;
s2, evaluation reference data acquisition: respectively acquiring a plurality of physical and chemical characteristic parameters of each test as evaluation reference data, wherein the acquired evaluation reference data comprises three types: the discharge characteristic parameters, the gas decomposition component characteristic parameters and the material performance change characterization parameters in the GIT comprehensively reflect the discharge severity and the influence of the discharge faults on the internal operation condition of the GIT from the direct condition of the discharge faults, the environment-friendly insulating gas decomposition condition and the material characteristics of the GIT respectively;
s3, carrying out comprehensive quantitative evaluation to obtain an electrical stability index applied in the environment-friendly insulating gas GIT: and (3) integrating all three types of evaluation reference data obtained by various types of discharge tests, gradually giving corresponding weights class by class, and carrying out weighting calculation integration to finally obtain the electrical stability index of the environment-friendly insulating gas for GIT application.
The method for evaluating the electrical stability of the environment-friendly insulating gas applied to the GIT is described below by a specific example, wherein the environment-friendly insulating gas is C 4 F 7 N/CO 2 The mixed gas is used for carrying out the electrical stability evaluation of GIT-oriented application, and the method comprises the following steps:
step 1, discharge test: for C 4 F 7 N/CO 2 The mixed gas is subjected to a low-energy discharge test, a high-energy discharge test and a flashover discharge test in sequence;
the low-energy discharge test mainly tests partial discharge faults, and the high-energy discharge test mainly tests arc discharge faults; test is carried out under test conditions that a series of externally applied voltages are respectively applied to various types of discharge tests, the externally applied voltage range of the partial discharge test is set to be 10 kV-18 kV, the externally applied voltage step is set to be 2 kV, namely 5 groups of tests are carried out on each type of discharge。
The partial discharge fault test performed by the low-energy discharge test and the arc discharge fault test performed by the high-energy discharge test are divided into a discharge test for a metal material in the GIT and a discharge test for an insulating material in the GIT; the discharge test of the metal material in the GIT adopts a discharge test platform shown in the figure 1, and a discharge four-needle electrode model which is shown in the figure 2 and is used for carrying out frequent partial discharge test on the environment-friendly insulating gas is adopted in a discharge test area in the middle of the platform; the inter-winding discharge model for the inter-winding discharge test of the GIT is shown in FIG. 4.
In the high-energy discharge test, the inter-turn discharge model of the winding shown in fig. 4 is adopted for the discharge test of the insulating material in the GIT, and in order to enhance the arc discharge effect, an arc striking wire with the diameter of 0.5mm can be connected between the upper conductive rod and the lower conductive rod of the device, and the arc striking wire is made of copper.
In this embodiment, only the in-GIT metal material discharge test is performed in the low-energy discharge test, and only the in-GIT insulating material discharge test is performed in the high-energy discharge test.
The flashover discharge test adopts a discharge test platform shown in fig. 1, and a gas-solid surface flashover discharge model shown in fig. 3 is adopted in a discharge test area in the middle of the platform;
when various discharge tests are carried out, firstly, wiping a model and a test platform to be clean by using non-woven fabrics dipped with alcohol, covering a top cover of a stainless steel gas tank, tightening hexagonal screws around the stainless steel gas tank, checking the air tightness of the test device, vacuumizing the stainless steel gas tank by using a vacuum pump, and sequentially filling CO 2 Gas and C 4 F 7 N gas to make total air pressure 0.2MPa, C 4 F 7 The content of N gas is 20%, the device is kept stand for 24 hours, then the positive lead-out wire of the device is connected with the positive pole of the alternating-current high-voltage power supply, the negative lead-out wire is connected with the negative pole of the alternating-current high-voltage power supply, the stainless steel tank shell is reliably grounded, and the external voltage is adjusted to sequentially carry out 5 groups of tests.
Step 2, evaluation reference data acquisition: the following three types of data are collected for each type of test performed in step 1: discharge characteristic parameters, gas decomposition component characteristic parameters and material performance change characterization parameters in the GIT;
establishing a set for discharge characteristic parameter classesThe discharge characteristic parameter class comprises parameter items +.>For initial discharge voltage, breakdown voltage, discharge energy, discharge frequency, discharge maximum amplitude, i.e. set +.>There are a total of 5 elements,pair C by corresponding device before the experiment starts 4 F 7 N/CO 2 The mixed gas is used for measuring partial discharge initial discharge voltage and breakdown voltage, when a plurality of groups of applied voltages are applied, an oscilloscope is used for collecting discharge waveforms for a low-energy discharge test, a high-energy discharge test and a flashover discharge test are used for collecting discharge voltage waveforms by using a high-voltage probe, a Rogowski coil is used for collecting discharge current waveforms, the maximum discharge amplitude is recorded, the discharge energy is calculated according to the integral of the voltage current waveforms, and the discharge frequency is calculated by taking an alternating current cycle to count the discharge times. For C 4 F 7 N/CO 2 The mixed gas is sequentially subjected to a partial discharge test, an arc discharge test and a flashover discharge test, and the designed defect model is adopted to obtain initial discharge voltages of 9.3 kV, 6.8 kV and 7.6 kV respectively, and breakdown voltages of 31.5 kV, 21.3 kV and 25.8 kV respectively. And applying a series of external voltages according to the conditions, and testing discharge energy, discharge frequency and discharge maximum amplitude, wherein the discharge energy adopts single average discharge energy, the single average discharge energy of a 10 kV-18 kV partial discharge test is sequentially 20 pC, 23 pC, 29 pC, 35 pC and 41 pC, the discharge frequencies are sequentially 36, 79, 183, 315 and 776 times/second, and the discharge maximum amplitude is sequentially 0.005V, 0.01V, 0.035V, 0.07V and 0.1V.
Establishing a set for characteristic parameter classes of gas decomposition componentsThe characteristic parameters of the gas decomposition component comprise the parameter item +.>For various characteristic gas decomposition components of the tested environment-friendly insulating gas, which characterize the severity of discharge faults, in combination with C 4 F 7 N/CO 2 The discharge decomposition characteristics of the mixed gas are attributed to CO and CF 4 、C 2 F 6 、CF 3 CN gas is the main gas decomposition product, and the content of the gas is increased along with the increase of discharge energy, and the COF is formed 2 The content of the gas increases obviously when the discharge severity is increased, and then the 5 gases can be selected as the characterization C 4 F 7 N/CO 2 The electrically stable characteristic gas decomposition component of the mixed gas used in the GIT, i.e. the collection +.>There are 5 elements in total->After the discharge test is carried out, a gas chromatograph-mass spectrometer is used for detecting the gas components in the stainless steel gas tank, and standard gas is used for determining the concentration of the selected characteristic gas decomposition components, and the content ratio of different characteristic gas decomposition components can be further adopted as the characteristic parameters of the gas decomposition components. The main gas decomposition products CO and CF of discharge decomposition are detected in the discharge type test process 4 、C 2 F 6 、CF 3 CN and COF 2 The content of the components in the (a) is detected after the pressurization time is 12 hours for the partial discharge test, and the arc discharge test and the flashover discharge test are detected after the breakdown is completed. The decomposition products of the 10 kV-18 kV partial discharge test are respectively 153ppm, 178ppm, 186ppm, 202ppm and 231ppm in the CO content, and CF 4 13ppm, 15ppm, 16ppm, 19ppm and 23ppm, C 2 F 6 The content of (C) was 1.4ppm, 1.5ppm, 1.9ppm, 2ppm and 2.3ppm in this order, CF 3 The content of CN was 1.2ppm, 1.5ppm, 1.7ppm and 2ppm in this order, COF 2 The content of (C) was 0.8ppm, 1ppm, 1.2ppm, 1.3ppm and 1.6ppm in this order. Arc discharge test decomposition products CO, CF 4 、C 2 F 6 、CF 3 CN and COF 2 The content of (C) was 381ppm, 47ppm, 5.8ppm, 4.9ppm and 4.5ppm in this order. Breakdown products CO, CF in flashover discharge test 4 、C 2 F 6 、CF 3 CN and COF 2 The content of (C) was 366ppm, 42ppm, 5.6ppm, 4.5ppm and 4.5ppm in this order.
Establishing a set for the characterization parameter class of the material performance change in the GITThe characteristic parameter class of the material property change in the GIT comprises a parameter item +.>For the severity of the discharge marks on the surface of the metal material, the degree of deterioration of the insulating material, the solids precipitation, i.e. the collection +.>There are 3 elements in total->The method comprises the steps of calculating the specific gravity of the total surface area of the metal material, which is occupied by the surface discharge trace area, of the metal material, measuring the degradation volume of the insulating material, calculating the ratio of the degradation volume to the total volume of the insulating material, calculating the specific gravity of the total surface area of the metal material, which is occupied by the surface solid precipitation area, and determining the content of each element by utilizing an X-ray photoelectron spectroscopy. And after the discharge type tests are finished, measuring the performance characterization parameters of the materials, wherein the severity of discharge marks on the surface of the metal material after the 10 kV-18 kV partial discharge test is 11%, 14%, 16%, 18% and 23%, and the solid precipitation amount is 10%, 13%, 16%, 17% and 20%. The severity of the discharge trace on the surface of the metal material after the arc discharge test, the degree of deterioration of the insulating material and the amount of solid precipitation were 27%, 21% and 26% in this order. The severity of discharge trace on the surface of the metal material after the flashover discharge test, the degree of deterioration of the insulating material and the amount of solid precipitation were 26%, 18% and 26% in this order.
Step 3, carrying out comprehensive quantitative evaluation to obtain an electrical stability index applied in the environment-friendly insulating gas GIT: all three kinds of evaluation reference data obtained by various types of discharge tests are synthesized, corresponding weights are given step by step in a class-by-class manner to carry out weighting calculation integration, and finally, the electrical stability index of the environment-friendly insulating gas for GIT application is obtained;
the method specifically comprises the following substeps:
step 3.1: first-stage weighting is carried out on each item of data in each of three types of evaluation reference data under the condition that different externally applied voltage tests are applied to each type of discharge test:
performing first class weighting to give each discharge characteristic parameterFirst-level first-class weight->Weight satisfies->. For the initial discharge voltage and breakdown voltage data (collectively voltage data), if the voltage value is larger, the given weight is higher, otherwise, the weight is lower; for discharge energy, discharge frequency and discharge maximum amplitude, the smaller the value, the higher the weight given, and conversely, the lower. And since voltage data is generally used as an insulation performance index, the set weight should be larger than other parameters. And simplifying the weight assignment under different applied voltage test conditions, enabling the weight setting to be consistent, and selecting test data of the applied voltage test conditions with intermediate values to determine the weight. For partial discharge test, the ratio of the voltage parameter weight to other parameter weights is 0.8: the sum of the weights of 0.2, namely the initial discharge voltage and the breakdown voltage is 0.8, and the weight of the rest parameters is 0.2.
Wherein the initial discharge voltage parameter weight is taken asThe breakdown voltage parameter weight is obtained by subtracting the initial discharge voltage parameter weight from the voltage parameter weight (0.8); for other discharge parameters, the discharge maximum amplitude weight can be taken as +.>The method comprises the steps of carrying out a first treatment on the surface of the The discharge frequency weight can be +.>；
Aiming at an arc discharge test and a flashover discharge test, the initial discharge voltage and the breakdown voltage discharge characteristic parameter weight are sequentially 0.2 and 0.8;
obtaining the discharge characteristic index under the test condition。
Weighting the test result of the partial discharge test, and taking various discharge characteristic parameters: the weights of the initial discharge voltage, the breakdown voltage, the discharge energy, the discharge frequency and the discharge maximum amplitude are 0.3, 0.5, 0.1, 0.01 and 0.09 in sequence, and the discharge characteristic indexes of the partial discharge test 5 groups of tests obtained through calculation are 20.9, 21.63, 23.27, 25.2 and 30.41 in sequence. Weighting the test results of the arc discharge test and the flashover discharge test, taking the discharge characteristic parameters of the initial discharge voltage and the breakdown voltage to be 0.2 and 0.8 in sequence, and calculating to obtain the discharge characteristic indexes of the arc discharge test and the flashover discharge test to be 18.4 and 22.16 in sequence.
Performing first-stage second-class weighting to give characteristic parameters to various gas decomposition components First class second class weightsCO, CF is selected 4 、C 2 F 6 、CF 3 CN、COF 2 Gas as characterization C 4 F 7 N/CO 2 The characteristic gas decomposition component of the electrical stability of the mixed gas applied in the GIT, the concentration of the above gas after the test is detected and used as the characteristic parameter of each gas decomposition component->Weight satisfies->. Due to the above selected characteristic gas decomposition components of CO and CF 4 The content of the gas is higher than that of other selected gases, and the COF 2 Gas in-situThe content of CO and CF increases obviously when the electric severity is increased 4 、COF 2 The gas is more representative of the severity of the discharge fault, and the concentration thereof should be weighted less than the other gases selected; the higher the content of the above-mentioned gas detected after the test, the smaller the weight given, and conversely, the larger the weight given, wherein the COF is considered 2 The gas is the most representative gas.
The selected characteristic gases are divided into representative gases and other gases, and the total ratio of the representative gases is determined to beFor each gas weight assignment in the representative gas class, the weight of the most representative gas may be taken as +.>The rest of the representative gas can be distributed with the rest weight value according to the content order; for other gases, the weight assignment can be directly carried out according to the content proportion of the gases in the other gases;
Obtaining the characteristic index of the gas decomposition component under the test condition。
Weighting the test result of the partial discharge test, and taking various characteristic gas decomposition components CO and CF 4 、C 2 F 6 、CF 3 CN、COF 2 The weights are 0.15, 0.3 and 0.1 in sequence, and the discharge characteristic indexes of the partial discharge test 5 groups of tests are 25.76, 29.86, 31.44, 34.39 and 39.55 in sequence. Weighting the results of arc discharge test and flashover discharge test, and taking the gas decomposition components CO and CF with various characteristics 4 、C 2 F 6 、CF 3 CN、COF 2 The weights are 0.1, 0.35 and 0.1 in sequence, and the calculated discharge characteristic indexes are 47 and 44.79 in sequence.
Performing first-stage third-class weighting to give characterization parameters of material performance change in each GITFirst-level third class weight->Weight satisfies->。
The severity of the discharge trace on the surface of the metal material, the degradation degree of the insulating material and the solid precipitation amount are all that the greater the severity is, the smaller the weight is, otherwise, the greater the weight is. Weighting the test result of the partial discharge test, and taking the weight of the severity of discharge trace on the surface of the metal material and the solid precipitation amount as 0.6 and 0.4 in sequence. Aiming at arc discharge tests and flashover discharge tests, selecting the surface discharge trace severity of a metal material, the degradation degree of an insulating material and the parameter weights of solid precipitation amount to be 0.4, 0.4 and 0.2 in sequence; obtaining characteristic index of material property change in GIT under the test condition . The discharge characteristic indices of the partial discharge test 5 groups were calculated to be 10.6, 13.6, 16, 17.6 and 21.8 in this order. Weighting the results of arc discharge test and flashover discharge test, and taking the weight of each material performance change characterization parameter as 0.4, 0.4 and 0.2 in sequence, wherein the calculated discharge characteristic indexes are 24.4 and 22.8 in sequence.
Step 3.2: performing second-stage weighting on various characteristic indexes of three types of evaluation reference data under different applied voltage test conditions applied to various types of discharge tests: three types of characteristic indexes obtained after the first stage weighting: discharge characteristic indexCharacteristic index of gas decomposition component->And a characteristic index of variation in material properties within the GIT +.>Respectively giving a second-stage weight、/>And->Weight satisfies->. As the electrical stability evaluation of the environment-friendly insulating gas for GIT application is carried out, the above characteristic indexes comprehensively reflect the discharge severity and the influence of the discharge faults on the internal operation condition of the GIT from different angles such as the direct discharge fault condition, the decomposition condition of the environment-friendly insulating gas, the material characteristics of the GIT and the like, and especially consider the special materials in the GIT, and change the characteristic indexes of the material performance in the GIT>The weight is given greater. Three types of characteristic index weights are selected >、/>And->0.3, 0.4 in this order, a discharge evaluation reference index +.>. Weighting three types of evaluation reference data of each discharge type test, taking the discharge characteristic index, the gas decomposition component characteristic index and the characteristic index of the material performance change in the GIT as 0.3, 0.3 and 0.4 in sequence, and calculating to obtain each discharge evaluation reference index of the partial discharge test 5 groups of tests as 18.24, 20.89, 22.81, 24.92 and 29.71 in sequence. The discharge evaluation reference index for the arc discharge test, flashover discharge test was 29.38 and 29.205 in this order.
Step 3.3: for each typeDischarge evaluation reference indexes of the discharge test under the test condition of applying different externally applied voltages are weighted in a third stage: discharge evaluation reference index of 5 groups of tests respectively giving different applied voltages to respective discharge typesThird level weight->The higher the applied voltage, the greater the weight given, the weight satisfying +.>According to the gradient of the applied voltage value, selecting weights according to the corresponding proportion to obtain the comprehensive discharge index of each type of discharge testWherein->Represents the discharge test type>The method comprises the steps of carrying out a first treatment on the surface of the If the voltage sequences applied in the examples are equidistant, the weights given to the partial discharge test 5 groups are 0.1, 0.2 and 0.4 in order, and the comprehensive discharge index of the partial discharge test is 25.34. The combined discharge indexes of the arc discharge test and the flashover discharge test are 29.38 and 29.205.
Step 3.4: fourth-stage weighting is carried out on the comprehensive discharge indexes of all types of discharge tests, and the comprehensive discharge indexes of all types of discharge tests are respectively givenFourth level weight->Weight satisfies->. According to the severity of various types of discharge tests, the high-energy discharge test is dealt withThe combined discharge index of the test and flashover discharge test is given a higher weight. The comprehensive discharge index weights under the low energy, high energy and flashover discharge tests are selected to be 0.2, 0.4 and 0.4 in sequence, and finally the electrical stability index +_ of the environment-friendly insulating gas applied to GIT is obtained>The larger the value, the better the electrical stability of the environmentally friendly insulating gas for GIT-oriented applications. C for the development described above 4 F 7 N/CO 2 The mixed gas is applied in GIT to test various discharge types, the weights of the comprehensive discharge indexes of the partial discharge test, the arc discharge test and the flashover discharge test are 0.2, 0.4 and 0.4 in sequence, the working condition is calculated to be the total air pressure of 0.2MPa, C is calculated 4 F 7 The GIT-oriented electrical stability index at 20% N gas content was 28.502. For comparison with other environment-friendly insulating gases, the evaluation of the electrical stability performance of other gases for GIT-oriented applications should be carried out simultaneously.
The present invention is not limited to the above-mentioned embodiments, but any modifications, equivalents, improvements and modifications within the scope of the invention will be apparent to those skilled in the art.
Claims (10)
1. The GIT application-oriented environment-friendly insulating gas electrical stability evaluation device is characterized by comprising a tank body and a typical defect physical model in a simulated GIT arranged in the tank body;
the tank body is a sealed tank body and is provided with an air inlet and an air outlet;
the typical defect physical model in the simulated GIT comprises a discharge four-needle electrode model, a gas-solid surface flashover discharge model and a winding turn-to-turn discharge model;
the discharging four-needle electrode model comprises a flat electrode and four-needle electrodes perpendicular to the flat electrode;
the gas-solid surface flashover discharge model comprises a needle electrode, an insulating plate and a plate electrode; the insulating plate is arranged on the flat electrode, and the pin electrode is perpendicular to the flat electrode and is positioned on one side of the insulating plate;
the winding turn-to-turn discharge model comprises a first conductive rod and a second conductive rod; the two conductive rods are wrapped with GIT film materials and are vertically arranged in parallel, penetrate out of the side wall of the tank body and are subjected to sealing treatment;
the stability assessment device performs different tests by selecting the typical defect physical model in different simulated GITs.
2. The GIT-application-oriented environment-friendly insulating gas electrical stability assessment device according to claim 1, wherein in the discharge four-needle electrode model, the four-needle electrode is of a claw-type structure, and the upper end of the four-needle electrode is connected with a tank body through a fixing rod; the plate electrode is connected with the tank body through a fixed rod.
3. The GIT-application-oriented environment-friendly insulating gas electrical stability assessment device according to claim 1, wherein in the gas-solid surface flashover discharge model, the lower end of the needle electrode is a tip, the upper end is a reducing smooth transition, and the needle electrode is connected to the tank body through a fixing rod; the plate electrode is connected with the tank body through a fixed rod.
4. The GIT-application-oriented environment-friendly insulating gas electrical stability assessment device according to claim 1, wherein in the winding inter-turn discharge model, the conducting rod is a square copper wire, vertical projection parts of the first conducting rod and the second conducting rod are overlapped, and the first conducting rod and the second conducting rod penetrate out of two sides of the tank body respectively.
5. The GIT-application-oriented environment-friendly insulating gas electrical stability assessment device according to claim 1, wherein in the gas-solid surface flashover discharge model, the insulating plate is a polyethylene terephthalate film or an insulating paperboard; in the winding turn-to-turn discharge model, the GIT film material is polyethylene terephthalate.
6. A method for evaluating the electrical stability of an environment-friendly insulating gas by using the device for evaluating the electrical stability of an environment-friendly insulating gas according to any one of claims 1 to 5, comprising the following steps:
(1) Discharge test: performing discharge tests on the environment-friendly insulating gas by using an environment-friendly insulating gas electrical stability evaluation device facing GIT application, wherein the discharge tests comprise a low-energy discharge test, a high-energy discharge test and a flashover discharge test, and different external voltages are applied in the test process;
(2) Evaluation reference data acquisition: the physical and chemical characteristic parameters of each test are respectively obtained and used as evaluation reference data, and the characteristic parameters comprise three types: the discharge characteristic parameters, the gas decomposition component characteristic parameters and the material performance change characterization parameters in the GIT comprehensively reflect the discharge severity and the influence of the discharge faults on the internal operation condition of the GIT from the direct condition of the discharge faults, the environment-friendly insulating gas decomposition condition and the material characteristics of the GIT respectively;
(3) Carrying out comprehensive quantitative evaluation to obtain an electrical stability index applied in the environment-friendly insulating gas GIT: and comprehensively evaluating the reference data, gradually giving corresponding weights class by class for weighting calculation integration, and finally obtaining the electrical stability index of the environment-friendly insulating gas for GIT application.
7. The evaluation method according to claim 6, wherein: in the step (1), the partial discharge test is used for the low-energy discharge test, the arc discharge test is used for the high-energy discharge test, and each type of discharge test comprises Group test (S)/(S)>Determining according to the number of the set externally applied voltage test conditions;
the low-energy discharge test is carried out on a metal material and an insulating material in the GIT; carrying out a discharge test on the metal material in the GIT by adopting a four-needle plate electrode model; carrying out a GIT internal insulation material discharge test by adopting a winding turn-to-turn discharge model;
the high-energy discharge test is carried out on a metal material and an insulating material in the GIT; carrying out a discharge test on the metal material in the GIT by adopting a four-needle plate electrode model; carrying out a GIT internal insulation material discharge test by adopting a winding turn-to-turn discharge model;
the flashover discharge test is carried out by adopting a gas-solid surface flashover discharge model, and high voltage is applied to two ends of the model to trigger the surface flashover.
8. The evaluation method according to claim 6, wherein: in the step (2), the step of (c),
establishing a set for discharge characteristic parameter classesThe discharge characteristic parameter class comprises parameter items +.>Respectively, a starting discharge voltage, a breakdown voltage, a discharge energy, a discharge frequency and a discharge maximum amplitude, namely, a set +.>There are a total of 5 elements,；
establishing a set for characteristic parameter classes of gas decomposition componentsThe characteristic parameters of the gas decomposition component comprise the parameter item +.>For the various characteristic gas decomposition components of the tested environment-friendly insulating gas, which characterize the severity of the discharge fault, the set +. >The number of the elements is determined according to the discharge decomposition characteristics of the tested environment-friendly insulating gas, and the number of the elements is set ∈>The element is->Personal (S)>；
Establishing a set for the characterization parameter class of the material performance change in the GITThe characteristic parameter class of the material property change in the GIT comprises a parameter item +.>The severity of discharge marks on the surface of the metal material, the deterioration degree of the insulating material, and the solid precipitation amount, i.e. the collectionThere are 3 elements in total->。
9. The evaluation method according to claim 6, wherein: said step (3) comprises the sub-steps of:
performing first-stage weighting on each sub-item data in each of three types of evaluation reference data under different externally applied voltage test conditions applied to each type of discharge test: performing first-stage first-class weighting on each discharge characteristic parameter, and endowing corresponding weights of the first-stage first class to obtain a discharge characteristic index under the test condition; performing first-stage second-class weighting on each characteristic parameter of the gas decomposition component, and endowing the first-stage second-class with corresponding weight to obtain a characteristic index of the gas decomposition component under the test condition; performing first-stage third-class weighting on the characteristic parameters of the material performance change in each GIT, and endowing the corresponding weights of the first-stage third class to obtain characteristic indexes of the material performance change in the GIT under the test condition;
Performing second-stage weighting on various characteristic indexes of three types of evaluation reference data under different applied voltage test conditions applied to various types of discharge tests: respectively giving corresponding weights of a second stage to the discharge characteristic index, the gas decomposition component characteristic index and the material performance change characteristic index in the GIT under the test condition to obtain a discharge evaluation reference index under the test condition;
performing third-stage weighting on discharge evaluation reference indexes of each type of discharge test under the condition of applying different externally applied voltages, and endowing the third stage with corresponding weight to obtain comprehensive discharge indexes of each type of discharge test;
and carrying out fourth-stage weighting on the comprehensive discharge indexes of all types of discharge tests, and endowing the fourth-stage with corresponding weights to obtain the electrical stability index of the environment-friendly insulating gas applied to the GIT.
10. The evaluation method according to claim 9, characterized in that: in the substep of the step (3):
the first stage of weighting is applied with different voltages in each discharge typeGroup test for the +.>Data obtained by the set of applied voltage condition tests are endowed with various discharge characteristic parameters +.>First-level first-class weight->The weight satisfies ；
For partial discharge test, the sum of the initial discharge voltage and the breakdown voltage is 0.8, and the sum of the weights of the residual parameters is 0.2;
wherein the initial discharge voltage parameter weight is taken asThe breakdown voltage parameter weight is obtained by subtracting the initial discharge voltage parameter weight from 0.8; the discharge maximum amplitude weight is taken as +.>The method comprises the steps of carrying out a first treatment on the surface of the The discharge frequency weight is taken as +.>；
Aiming at an arc discharge test and a flashover discharge test, the initial discharge voltage and the breakdown voltage discharge characteristic parameter weight are sequentially 0.2 and 0.8;
obtaining the discharge characteristic index under the test condition；
The first-stage second-class weighting gives each gas decomposition component characteristic parameterFirst-level second-class weights->Weight satisfies->；
The selected characteristic gas is divided into representative gas and other gas, and the total ratio of the representative gas is determined to beFor each gas weight assignment in the representative gas class, the weight of the most representative gas is taken as +.>The rest representative gases distribute the rest weight values according to the content orders; for other gases, carrying out weight assignment according to the content proportion of the gases in the other gases;
obtaining the characteristic index of the gas decomposition component under the test condition；
The first-stage third class weighting is given to the characteristic parameters of the material performance change in each GIT First-level third class weight->Weight satisfies->The method comprises the steps of carrying out a first treatment on the surface of the The weight of parameters of the severity degree of discharge trace and the solid precipitation amount of the surface of the metal material is 0.6 and 0.4 in sequence for the partial discharge test; aiming at an arc discharge test and a flashover discharge test, the surface discharge trace severity of the metal material, the degradation degree of the insulating material and the parameter weight of the solid precipitation amount are 0.4, 0.4 and 0.2 in sequence;
obtaining characteristic index of material property change in GIT under the test condition；
The second stage weighting is to apply voltages different from each discharge typeGroup test for the +.>Three types of characteristic indexes obtained by the group external voltage condition test: discharge characteristic index->Characteristic index of gas decomposition component->And a characteristic index of variation in material properties within the GIT +.>Second-level weights are respectively given +.>、/>And->Weight satisfies->；/>、/>And->Sequentially 0.3, 0.3 and 0.4 to obtain discharge evaluation reference index under the test condition；
The third stage weighting is used for respectively giving different applied voltages to each discharge typeDischarge evaluation reference index of group test +.>Third stageWeight->Wherein->Weight satisfies->The method comprises the steps of carrying out a first treatment on the surface of the According to the gradient of the applied voltage value, selecting weight according to the corresponding proportion to obtain the comprehensive discharge index +. >Wherein->Represents the discharge test type>；
The fourth-stage weighting is respectively endowed with comprehensive discharge indexes of various types of discharge testsFourth level weight->Weight satisfies->The method comprises the steps of carrying out a first treatment on the surface of the Wherein the comprehensive discharge index weights under the low-energy, high-energy and flashover discharge tests are 0.2, 0.4 and 0.4 in sequence, and the electrical stability index +.>。
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| 沈湘东: "纳秒脉冲电压电极介质覆盖SF6放电特性研究", 《工程科技Ⅱ辑》, 31 March 2018 (2018-03-31), pages 042 - 17 * |
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