CN110927267A - Gas insulated switchgear fault diagnosis method based on decomposition component analysis method - Google Patents
Gas insulated switchgear fault diagnosis method based on decomposition component analysis method Download PDFInfo
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- CN110927267A CN110927267A CN201911156811.XA CN201911156811A CN110927267A CN 110927267 A CN110927267 A CN 110927267A CN 201911156811 A CN201911156811 A CN 201911156811A CN 110927267 A CN110927267 A CN 110927267A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004458 analytical method Methods 0.000 title claims abstract description 16
- 238000000354 decomposition reaction Methods 0.000 title claims abstract description 16
- 238000003745 diagnosis Methods 0.000 title claims abstract description 16
- 238000005070 sampling Methods 0.000 claims abstract description 30
- LSJNBGSOIVSBBR-UHFFFAOYSA-N thionyl fluoride Chemical compound FS(F)=O LSJNBGSOIVSBBR-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000004817 gas chromatography Methods 0.000 claims abstract description 5
- OBTWBSRJZRCYQV-UHFFFAOYSA-N sulfuryl difluoride Chemical compound FS(F)(=O)=O OBTWBSRJZRCYQV-UHFFFAOYSA-N 0.000 claims abstract description 4
- 230000007547 defect Effects 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 6
- 238000010891 electric arc Methods 0.000 claims description 4
- 238000004904 shortening Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 51
- 229910018503 SF6 Inorganic materials 0.000 description 10
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 10
- 238000001514 detection method Methods 0.000 description 5
- 238000013021 overheating Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 238000003331 infrared imaging Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
Abstract
The invention relates to a gas insulated switchgear fault diagnosis method based on a decomposition component analysis method, which comprises the following steps: step 1, sampling gas through a gas sampling port of GIS equipment; step 2, detecting the gas components and the content based on the gas chromatography to obtain the content of each component in the sample; the gas to be detected comprises SO2F2、SOF2、SO2、H2S、CO2、CF4And S2OF10(ii) a Step 3, based on SO2/H2S、SOF2/S2OF10、SO2/H2And judging the fault type within the specific value range of S to obtain a fault diagnosis result. The method utilizes chemical means to judge the running state of the electrical equipment, and has the advantages of low cost, simple and convenient operation and high judgment accuracy.
Description
Technical Field
The invention belongs to the technical field of fault diagnosis of gas insulated switchgear, and particularly relates to a fault diagnosis method of a gas insulated switchgear based on a decomposition component analysis method.
Background
The gas insulated switchgear (hereinafter referred to as GIS) is an electrical primary device in a transformer substation except for a transformer, and comprises a circuit breaker, a disconnecting switch, a grounding disconnecting link, a voltage transformer, a current transformer, a lightning arrester, a bus, a cable terminal, a wire inlet and outlet sleeve and the like, which are organically combined into a whole through optimized design and are sealed in a metal shell, and sulfur hexafluoride (hereinafter referred to as SF6) gas is used as an arc extinguishing medium and an insulating medium to form the sealed switchgear. The GIS is a form of a high-voltage distribution switch, can be regarded as the whole of a switch station, and is used as important primary equipment in a transformer substation, once a fault occurs, the planned shutdown of the transformer substation is caused, and the safe and stable operation of a system is influenced. Therefore, it is necessary to effectively monitor the running state of the GIS equipment.
At present, a pulse current method, an ultrasonic method, an ultrahigh frequency method and the like can be adopted for diagnosing the discharging fault of the GIS, but the pulse current method and the ultrasonic method are easily interfered by field electromagnetic noise due to various strong interferences on the field; although the ultrahigh frequency method has strong anti-interference capability, it is difficult to perform quantitative analysis on discharge and make accurate judgment on the operation state. For the GIS overheating fault, although the surface temperature of the GIS overheating fault can be measured by an infrared imaging method for judgment, when the GIS is internally subjected to the overheating fault, the fault surface temperature is influenced by the thermal resistance coefficient of SF6 gas, the distance between a heat source and the surface of an equipment shell and the like, the local overheating point temperature in the GIS cannot be judged by directly measuring the surface temperature of the GIS through infrared, and the GIS cannot be monitored in real time through related electric, magnetic, optical and ultrasonic signals excited in the discharging process like the discharging fault.
Disclosure of Invention
The invention aims to provide a fault diagnosis method of a gas insulated switchgear based on a decomposition component analysis method, which is used for monitoring impurity gases except SF6 generated when GIS equipment breaks down and judging the real-time operation state of the GIS equipment based on an SF6 gas decomposition component analysis method in the GIS equipment.
The invention provides a gas insulated switchgear fault diagnosis method based on a decomposition component analysis method, which comprises the following steps:
step 1, sampling gas through a gas sampling port of GIS equipment;
Step 3, based on SO2/H2S、SOF2/S2OF10、SO2/H2And judging the fault type within the specific value range of S to obtain a fault diagnosis result.
Further, the period of gas sampling in step 1 includes:
sampling periodically in the running process of equipment, wherein the sampling period is 1 time/month;
sampling GIS equipment suspected of having fault defects immediately;
and for the GIS equipment with faults, shortening the sampling period after the defects are eliminated until the monitored gas components are stable within a period of time, and recovering the original sampling period.
Further, step 3 specifically includes:
if the detected gas component is SO2、H2S, and satisfies 1 or more SO2/H2S is less than or equal to 5, the equipment is judged to generate arc discharge and SO2/H2The smaller the S ratio, the larger the discharge energy;
if the detected gas component is SOF2、S2OF10And satisfies the SOF of 8 or more2/S2OF10If the voltage is less than or equal to 25, judging that the local discharge defect occurs in the equipment;
if the detected gas component is SO2、H2S、CO2，CF4And satisfies SO of 8. ltoreq2/H2And S is less than or equal to 25, judging that the hot spot exists in the equipment.
By means of the scheme, the gas insulated switchgear fault diagnosis method based on the decomposition component analysis method utilizes a chemical means to judge the running state of the electrical equipment, has the advantages of low cost, simplicity and convenience in operation and high judgment accuracy, and specifically comprises the following technical effects:
1) the device body does not need to be modified or a complex detection element is implanted, only the gas needs to be sampled, and the operation is simple and convenient;
2) the analysis work can be carried out when the equipment runs, and the running state of the GIS equipment can be monitored in real time;
3) the method is not influenced by environmental noise and strong electromagnetic interference, and the fault judgment accuracy is high.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a flow chart of a gas insulated switchgear fault diagnosis method based on a decomposition component analysis method according to the present invention;
fig. 2 is a schematic diagram of the gas formation process of the various components of SF6 gas.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1, the present embodiment provides a method for diagnosing a fault of a gas insulated switchgear based on a decomposition component analysis method, including:
step S1, sampling gas through a gas sampling port of GIS equipment;
step S2, detecting the gas components and the content based on the gas chromatography to obtain the content of each component in the sample; the gas to be detected comprises SO2F2、SOF2、SO2、H2S、CO2、CF4And S2OF10；
Step S3, based on SO2/H2S、SOF2/S2OF10、SO2/H2And judging the fault type within the specific value range of S to obtain a fault diagnosis result.
According to the fault diagnosis method for the gas insulated switchgear based on the decomposition component analysis method, SF6 decomposition products generated when GIS equipment breaks down are used as detection objects, sampling detection is performed regularly, the range of characteristic parameters is determined by calculating the ratio of different characteristic gas contents, and the fault type of the GIS equipment is diagnosed. The method for judging the running state of the electrical equipment by utilizing the chemical means has the advantages of low cost, simplicity and convenience in operation and high judgment accuracy.
The present invention is described in further detail below.
SF6 gas is used as insulating filling gas in GIS, and has stable chemical property and is not easy to decompose. However, under the action of factors such as partial discharge, spark discharge, arc discharge and local overheating, ionic bonds in SF6 gas molecules are broken and cracked to form SF5、SF4、SF3、SF2And low fluoride compounds (SFx) such as SF. SFx reacts further to form SO by reacting with impurity gases such as moisture and oxygen2F2、SOF2、SO2HF and H2S and other component gases; when reacting with solid organic insulating material, metal material, etc., SFx reacts further to produce CO2And CF4And the like. The formation of the various component gases is illustrated in figure 2.
The invention utilizes the generation change rule of the characteristic components, compares the characteristic parameter ranges of the gas of each component, establishes a decomposition-based component analysis method, and further realizes the state monitoring and fault diagnosis of SF6 gas insulation equipment, and the specific method is as follows:
the first step is as follows: and (6) sampling. The sampling can be carried out in the running process of the equipment, and the sampling is preferably carried out periodically, and the sampling period is 1 time/month. Sampling is carried out immediately aiming at GIS equipment suspected of having fault defects; after the defects of the GIS equipment which has failed are eliminated, the sampling period is shortened until the monitored gas components are stabilized within a period of time, and the original sampling period is recovered. During sampling, a hose is used for connecting a gas sampling port of the GIS equipment with the needle cylinder, and gas is introduced into the needle cylinder to be used as a detection sample.
The second step is that: and detecting the gas components and the content. The gas components generated under different fault types are quantitatively detected by adopting a gas chromatography commonly used in chemistry. The main detection gas is: SO (SO)2F2、SOF2、SO2、H2S、CO2、CF4And S2OF10. And acquiring the content of each component gas in the sample.
The third step: and establishing a model and analyzing.
According to the basic principle of the forming process of the gases with various components, the main characteristic gases generated by different fault types are summarized, and the SO utilization is summarized according to practice2/H2S、SOF2/S2OF10And SO2/H2And judging the fault type according to the ratio of S. The specific results are as follows:
in summary, it can be seen that:
1) if the characteristic gas component is detected to be SO2、H2S, SO satisfying 1 ≤2/H2And S is less than or equal to 5, the arc discharge of the equipment is judged, and the smaller the characteristic parameter value is, the larger the discharge energy is.
2) If the characteristic gas component is detected to be SOF2、S2OF10Satisfies the SOF of 8 or more2/S2OF10Less than or equal to 25, judging that partial discharge occurs in the equipmentAnd (5) a defect.
3) If the detected characteristic gas component is SO2、H2S、CO2，CF4Satisfies the condition that SO is not less than 82/H2And S is less than or equal to 25, and the existence of a hot spot in the equipment is judged.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (3)
1. A gas insulated switchgear fault diagnosis method based on a decomposition component analysis method is characterized by comprising the following steps:
step 1, sampling gas through a gas sampling port of GIS equipment;
step 2, detecting the gas components and the content based on the gas chromatography to obtain the content of each component in the sample; the gas to be detected comprises SO2F2、SOF2、SO2、H2S、CO2、CF4And S2OF10；
Step 3, based on SO2/H2S、SOF2/S2OF10、SO2/H2And judging the fault type within the specific value range of S to obtain a fault diagnosis result.
2. The method for diagnosing the fault of the gas insulated switchgear based on the decomposition component analysis method according to claim 1, wherein the period of the gas sampling in step 1 includes:
sampling periodically in the running process of equipment, wherein the sampling period is 1 time/month;
sampling GIS equipment suspected of having fault defects immediately;
and for the GIS equipment with faults, shortening the sampling period after the defects are eliminated until the monitored gas components are stable within a period of time, and recovering the original sampling period.
3. The method for diagnosing the fault of the gas insulated switchgear based on the decomposition component analysis method according to claim 1, wherein the step 3 specifically comprises:
if the detected gas component is SO2、H2S, and satisfies 1 or more SO2/H2S is less than or equal to 5, the equipment is judged to generate arc discharge and SO2/H2The smaller the S ratio, the larger the discharge energy;
if the detected gas component is SOF2、S2OF10And satisfies the SOF of 8 or more2/S2OF10If the voltage is less than or equal to 25, judging that the local discharge defect occurs in the equipment;
if the detected gas component is SO2、H2S、CO2，CF4And satisfies SO of 8. ltoreq2/H2And S is less than or equal to 25, judging that the hot spot exists in the equipment.
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| CN111551648A (en) * | 2020-06-01 | 2020-08-18 | 河北冀研能源科学技术研究院有限公司 | Method for diagnosing operation state and fault of sulfur hexafluoride electrical equipment |
| CN111562248A (en) * | 2020-05-15 | 2020-08-21 | 云南电网有限责任公司电力科学研究院 | Based on SF6Internal standard GIS fault diagnosis method |
| CN111983394A (en) * | 2020-07-03 | 2020-11-24 | 国网浙江省电力有限公司电力科学研究院 | Based on SF6GIS discharge fault diagnosis method for analysis of decomposition products |
| CN115267006A (en) * | 2022-08-11 | 2022-11-01 | 重庆科技学院 | Based on SF 6 Method for diagnosing fault of DC gas insulation equipment for decomposition component analysis |
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Cited By (5)
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Application publication date: 20200327 |