CN111123044A - SF (sulfur hexafluoride)6Method and device for judging GIS release amount by concentration of acidic decomposition product - Google Patents
SF (sulfur hexafluoride)6Method and device for judging GIS release amount by concentration of acidic decomposition product Download PDFInfo
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- 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
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- G01R31/1254—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 of components, parts or materials of gas-insulated power appliances or vacuum gaps
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01R31/1263—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1281—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of liquids or gases
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Abstract
SF (sulfur hexafluoride)6Method and device for judging GIS release amount by acid decomposition concentration, wherein the device comprises SF6GIS equipment (1) taking gas as insulating medium, GIS equipment gas taking valve (2) and SF6The device comprises an acid decomposition product concentration detection device (3), an ultrasonic partial discharge sensor (4), an ultrasonic partial discharge detection data processing and displaying device (5), an ultrahigh frequency partial discharge sensor (6) and an ultrahigh frequency partial discharge detection data processing and displaying device (7). SF for the process6The concentration detection device for the acidic decomposition products uses SF6The low-valence sulfide in the acidic decomposition product is oxidized into water-soluble high-valence sulfur oxide SO3(ii) a Adding SO3Dissolving in water to generate H2SO4H is prepared by standard alkali liquor2SO4Titrating to calculate the mass concentration of the acidic decomposition product expressed by the S element; partial discharge of detection result and ultrahigh frequency and ultrasonic waveAnd (4) combining the analysis results to comprehensively judge the discharge capacity of the GIS equipment. The method can accurately judge the magnitude of the latent local discharge in the GIS equipment, and ensures that the power grid runs stably.
Description
Technical Field
The invention relates to SF6A method and a device for judging GIS release amount by acid decomposer concentration belong to the technical field of transformer substation detection.
Background
In recent years, the national economy and the electricity consumption are rapidly increased, the number of domestic transformer substations is increased day by day, the land price is also increased, and therefore, a gas insulated metal enclosed switchgear (GIS) with a small floor area is generally selected for newly built transformer substations, which means that SF (sulfur hexafluoride) is used as a reference6The amount of gas used is also increasing. SF as insulating medium when partial discharge occurs in GIS internal equipment6The gas will decompose and affect the dielectric strength of the equipment and will also cause an unintended power outage. Therefore, for SF in GIS equipment6The work of detecting the gas decomposition products is important.
The power equipment for the fault discharge in GIS transformer substation in the power industry mainly adopts ultrahigh frequency electromagnetic wave, ultrasonic wave and SF6Gas decomposition products and the like are detected so as to judge whether discharge, discharge types and the like exist in the equipment, but the magnitude of partial discharge cannot be accurately measured, and only the signal amplitude, SF (sulfur hexafluoride) and the like can be measured by an ultrahigh frequency and ultrasonic sensor6The concentration of the gas decomposition products only stays at the stage of the isolated analysis of a plurality of decomposition product components, the correlation between the total concentration of the decomposition products and the magnitude of the partial discharge amount is not found, and no relevant data can be consulted at present.
Based on the above situation, an SF6The method for judging the release amount of the GIS according to the concentration of the acidic decomposition products can well solve the problem, and SF in GIS equipment can be detected by the detection method6The gas is sampled and oxidized, dissolved in demineralized water and titrated by standard alkali liquor, the concentration of acidic decomposition products is detected, and the detection result is combined with the analysis result of ultrahigh frequency and ultrasonic partial discharge measurement, so that a method capable of intuitively and accurately reflecting the magnitude of the partial discharge of the GIS equipment is found.
Disclosure of Invention
The purpose of the invention is to detect SF6The concentration of the acidic gas decomposer is used for monitoring the release amount of GIS equipment, thereby monitoring the damage degree of partial discharge of the equipment to the insulation and the operation of a power grid, and the SF is disclosed6A method for judging GIS release amount by acid decomposer concentration.
The technical scheme for realizing the invention is that SF6Method for judging GIS release amount by using concentration of acidic decomposition product, and SF is oxidized by using oxidation device6The low-valence sulfide in the acidic decomposition product is oxidized into water-soluble high-valence sulfur oxide SO3(ii) a Adding SO3Dissolving in water to generate H2SO4H is prepared by standard alkali liquor2SO4Titrating to calculate the mass concentration of the acidic decomposition product expressed by the S element; combining the detection result with the ultrahigh frequency and ultrasonic partial discharge analysis resultAnd judging the discharge capacity of the GIS equipment.
The oxidation device is SF6Acid decomposition thing concentration detection device.
The SF6The detection data of the acidic decomposition substance concentration detection device is SF6Concentration of acidic decomposition products by SF6The concentration of the acidic decomposition product determines the accumulated charge amount of the partial discharge.
SF (sulfur hexafluoride)6The detection device for judging GIS partial discharge amount by acid decomposer concentration comprises SF6GIS equipment with gas as insulating medium, gas taking valve of GIS equipment and SF6The device comprises an acid decomposer concentration detection device, an ultrasonic partial discharge sensor, an ultrasonic partial discharge detection data processing and displaying device, an ultrahigh frequency partial discharge sensor and an ultrahigh frequency partial discharge detection data processing and displaying device; an ultrasonic partial discharge sensor arranged on the outer pipe wall of the GIS equipment is connected with an ultrasonic partial discharge detection data processing and display; an ultrahigh frequency partial discharge sensor arranged on a pouring gate of the GIS equipment pipe wall is connected with an ultrahigh frequency partial discharge detection data processing and display; the gas taking pipe on the GIS equipment is connected with SF through the gas taking valve of the GIS equipment6Acid decomposition thing concentration detection device.
When SF6When the device is applied on site, if one of the acid decomposer concentration detection device, the ultrahigh frequency partial discharge detection device and the ultrasonic partial discharge detection device monitors suspicious signals, the method for judging the GIS partial discharge according to the concentration of the acid decomposer can judge the discharge in the GIS equipment according to the following steps:
when the device is applied, if one of the acid decomposer concentration detection device, the ultrahigh frequency partial discharge detection device and the ultrasonic partial discharge detection device monitors suspicious signals, the discharge capacity in the GIS equipment is judged according to the following steps:
(1) discharging metal particles:
the signal value detected by the ultrahigh frequency partial discharge device is higher than a background value, the discharge signal is regular in an ultrasonic pulse detection mode and is in a triangular hump shape, and the monitoring map preliminarily judges that metal particles are discharged, SF6When the concentration of the acidic decomposition product (expressed as the content of S element) is more than 0.1. mu.g/L, the judgment departmentThe portion discharge accumulated charge amount is larger than 100 pC.
(2) Suspension potential discharge:
the ultrahigh frequency partial discharge device detects that a discharge signal has certain symmetry, the pulse amplitude is large, the adjacent discharge time intervals are basically consistent, and in an ultrasonic continuous detection mode, a discharge map has strong 100Hz frequency correlation and is preliminarily judged to be suspension potential discharge, SF6When the concentration of the acidic decomposition product (expressed by the S element content) is more than 1.5. mu.g/L, the accumulated charge amount of the partial discharge is judged to be more than 1. mu.C.
(3) Air gap discharge:
the discharge signal detected by the ultrahigh frequency partial discharge device has certain symmetry, the amplitude of the discharge signal is dispersed, the discharge frequency is less, the ultrasonic partial discharge detection device is insensitive to the discharge signal, and the air gap discharge and SF (sulfur hexafluoride) are preliminarily judged6When the concentration of the acidic decomposition product (expressed by the S element content) is more than 1.0. mu.g/L, the accumulated charge amount of the partial discharge is judged to be more than 0.1. mu.C.
(4) Discharging a metal tip:
the discharge polarity detected by the ultrahigh frequency partial discharge device is very obvious, the discharge amplitude dispersibility is small, and the discharge map has strong 50Hz frequency correlation in an ultrasonic continuous detection mode, and the metal point discharge and SF are preliminarily judged to be metal point discharge6When the concentration of the acidic decomposition product (expressed by the S element content) is more than 0.5. mu.g/L, the accumulated charge amount of the partial discharge is judged to be more than 0.01. mu.C.
The method establishes a corresponding relation between the chemical characteristic detection of the acidic decomposition product and the partial discharge, and is obtained by establishing a BP neural network diagnosis model through experimental data. There were 36 tests, 9 tests were performed for each discharge pattern, 6 of which were plotted (cumulative discharge amounts 1 μ C, 2 μ C, 3 μ C, 4 μ C, 5 μ C, 6 μ C, respectively), while the other 3 were used to validate the neural network diagnostic model. The 4 different discharge forms are distinguished by ultrahigh frequency and ultrasonic spectrum detection; the concentration of the acidic decomposition product is detected by a chemical reagent by combining an ultrahigh frequency and ultrasonic spectrum, and the concentration of the acidic decomposition product is related to the discharge capacity.
The invention has the beneficial effects that the invention passes through SF6The concentration of the acidic decomposition product is detected to judge the partial discharge of the GIS, and the SF in the GIS is subjected to6And (3) sampling and analyzing the gas, detecting the mass concentration of the acidic decomposition product by using a method of dissolving the gas in water after oxidation and then carrying out titration analysis, combining the detection result with ultrahigh frequency and ultrasonic partial discharge analysis results, accurately judging the size of the latent partial discharge in the GIS equipment, providing an accurate maintenance strategy and ensuring the stable operation of a power grid.
Drawings
FIG. 1 shows an SF according to the present invention6A device schematic diagram for judging GIS release amount according to the concentration of the acidic decomposition products;
FIG. 2 shows the contents of acidic decomposition products corresponding to the discharge at a typical defect;
in the figure, 1 is by SF6GIS equipment with gas as an insulating medium; 2, a gas taking valve of the GIS equipment; 3 is SF6An acidic decomposition substance concentration detection device; 4, an ultrasonic partial discharge sensor; 5, ultrasonic partial discharge detection data processing and display; 6 is an ultrahigh frequency partial discharge sensor; and 7, ultrahigh frequency partial discharge detection data processing and display.
Detailed Description
The present invention will be described in detail below with reference to examples and drawings.
As shown in FIG. 1, the present embodiment is an SF6The device for judging GIS partial discharge amount by using the concentration of acidic decomposition products comprises the following steps of using SF6 GIS equipment 1 with gas as insulating medium, GIS equipment gas taking valve 2 and SF6An acid decomposition product concentration detection device 3, an ultrasonic partial discharge sensor 4, an ultrasonic partial discharge detection data processing and display 5, an ultrahigh frequency partial discharge sensor 6, and an ultrahigh frequency partial discharge detection data processing and display 7.
An ultrasonic partial discharge sensor 4 tightly attached to the outer pipe wall of the GIS equipment 1 is connected with an ultrasonic partial discharge detection data processing and display 5; an ultrahigh frequency partial discharge sensor 6 tightly attached to a pouring gate of the tube wall of the GIS device 1 is connected with an ultrahigh frequency partial discharge detection data processing and display 7; the gas taking pipe on the GIS equipment 1 is connected with SF through a gas taking valve 2 of the GIS equipment6Acid componentAnd a solution concentration detection device 3.
This example is an SF6Method for judging GIS release amount by using concentration of acidic decomposition product, SF6The GIS equipment 1 taking gas as insulating medium takes out the gas through a GIS equipment gas taking valve 2 and sends the gas sample to SF through a pipeline6The acid decomposition concentration detection device 3 carries out automatic detection such as oxidation, dissolution, titration and the like, an ultrasonic partial discharge detection sensor 4 is tightly attached to the outer pipe wall of the GIS equipment 1, a detected atlas is transmitted to an ultrasonic partial discharge detection data processing and display device 5, an ultrahigh frequency partial discharge sensor 6 is tightly attached to a pouring gate on the pipe wall of the GIS equipment 1, the detected atlas is transmitted to an ultrahigh frequency partial discharge detection data processing and display device 7, and SF is detected6The detection data of the acid decomposer concentration detection device 3, the data of the ultrasonic partial discharge detection data processing and display 5 and the data of the ultrahigh frequency partial discharge detection data processing and display 7 are gathered together, comprehensive judgment is carried out according to the method of the invention, and the latent or fault partial discharge amount in the GIS equipment is accurately measured.
In this embodiment, data is obtained through experiments, and a neural network model is then established to obtain a corresponding relationship between the concentration of the decomposition product and the partial discharge.
At SF6Under the condition that the gas pressure is 0.4Mpa and the micro-water content is 78 mu L/L, under the conditions that metal point discharge, suspension potential discharge, air gap discharge inside an insulating part and free metal particle discharge are measured in a laboratory, the accumulated discharge amount corresponding to the content of each acidic decomposition product is measured through an electric pulse partial discharge detection port, and the specific conditions under four discharge conditions are shown in Table 1.
TABLE 1 details of the four discharge cases and the specific cases
| Type of discharge | Initial voltage | Test voltage | Discharge time at cumulative discharge amount of 1 μ C |
| Point discharge | 35kV | 38kV | 460 minutes |
| Discharge of floating potential | 57kV | 60kV | 3.8 minutes |
| Air gap discharge | 30kV | 33kV | 36 minutes |
| Discharge of metal particles | 57kV | 60kV | 4800 min |
Wherein the discharge time was 3.8 minutes at an initial voltage of 57kV and a test voltage of 60kV, at which the cumulative discharge amount of the floating potential was 1. mu.C. SF in the case of cumulative discharge amounts of 1. mu.C, 2. mu.C and 3. mu.C, respectively6Specific data for the concentration of acidic decomposition products are shown in FIG. 2.
Diagnostic model for magnitude of defect discharge amount of equipment
Counting 24 groups of partial discharge test data (6 groups of data of each discharge type, the accumulated discharge amount is respectively 1 mu C, 2 mu C, 3 mu C, 4 mu C, 5 mu C and 6 mu C) obtained by the project, setting 10 input vectors such as filling air pressure and the like by adopting a BP neural network method, and arranging the input vectors in a columnIn table 2, the output vector is the cumulative discharge and the data is normalized by the premmx function of Matlab. The BP network consists of input layer, hidden layer and output layer, and the network selects S-type transfer function and makes use of back-propagation error function
Where Oi is the calculated output of the network and ti is the expected output (i.e., the actual measured value), the network weight and threshold are continuously adjusted to minimize the error function E. The method comprises the steps of inputting sample data into a network after normalization, setting excitation functions of a hidden layer and an output layer of the network as tan sig and logsig functions respectively, setting a network training function as a trailing dx, a network performance function as a mse, setting the number of hidden layer neurons as 6, and setting network parameters. The number of network iterations epochs is 5000, the expected error goal is 0.00000001, and the learning rate lr is 0.01. And after the parameters are set, determining the network nonlinear parameters. The network completes the parameter setting after the network achieves the expected error through 24 times of repeated adjustment.
TABLE 2 input vectors for plant Defect diagnosis model
| Input vector | Means of | Input vector | Means of |
| ξ1 | Filling air pressure | ξ6 | Concentration of acidic decomposition product |
| ξ2 | Micro water content | ξ7 | Metal point discharge |
| ξ3 | Initial voltage | ξ8 | Discharge of floating potential |
| ξ4 | Test voltage | ξ9 | Air gap discharge |
| ξ5 | Time of discharge | ξ10 | Discharge of metal particles |
For established SF-based6The gas acid decomposition product concentration and 4 discharge types are used for determining a diagnosis model of the accumulated discharge amount of the equipment, and model verification is carried out by using 12 groups of data (3 groups of data of each discharge type) measured in the field. For example: in the case of 1000 minutes of metal point discharge, SF was measured6The concentration of the acidic decomposition product was 1.2. mu.g/L, and the cumulative discharge amount was estimated to be 2.0. mu.C, which was close to 2.2. mu.C, which is an actually measured value (i.e., an expected output value), based on the established diagnostic model. The detailed verification results are shown in table 3, and the accuracy reaches more than 83%, which indicates that the established diagnosis model is effective. The analysis found that SF increases with the discharge intensity of the defect6The content of acidic decomposition products is increased and has a certain corresponding relation.
TABLE 3 results of model verification for diagnosing the magnitude of defective discharge of a device
Claims (4)
1. SF (sulfur hexafluoride)6The method for judging GIS release amount by using the concentration of the acidic decomposition product is characterized in that the method uses an oxidation device to oxidize SF6The low-valence sulfide in the acidic decomposition product is oxidized into water-soluble high-valence sulfur oxide SO3(ii) a Adding SO3Dissolving in water to generate H2SO4H is prepared by standard alkali liquor2SO4Titrating to calculate the mass concentration of the acidic decomposition product expressed by the S element; and combining the detection result with the ultrahigh frequency and ultrasonic partial discharge analysis result to comprehensively judge the discharge capacity of the GIS equipment.
2. An SF according to claim 26The method for judging GIS release amount by acid decomposition concentration is characterized in that SF6The detection data of the acidic decomposition substance concentration detection device is SF6Concentration of acidic decomposition products by SF6The concentration of the acidic decomposition product determines the accumulated charge amount of the partial discharge.
3. SF (sulfur hexafluoride)6Detection device for judging GIS partial discharge amount by concentration of acidic decomposition product, characterized in that the device comprises SF6GIS equipment with gas as insulating medium, gas taking valve of GIS equipment and SF6The device comprises an acid decomposer concentration detection device, an ultrasonic partial discharge sensor, an ultrasonic partial discharge detection data processing and displaying device, an ultrahigh frequency partial discharge sensor and an ultrahigh frequency partial discharge detection data processing and displaying device; an ultrasonic partial discharge sensor arranged on the outer pipe wall of the GIS equipment is connected with an ultrasonic partial discharge detection data processing and display; an ultrahigh frequency partial discharge sensor arranged on a pouring gate of the GIS equipment pipe wall is connected with an ultrahigh frequency partial discharge detection data processing and display; the gas taking pipe on the GIS equipment is connected with SF through the gas taking valve of the GIS equipment6Acid decomposition thing concentration detection device.
4. An SF according to claim 46Acidic decomposition productThe detection device for judging the GIS partial discharge amount by concentration is characterized in that when the device is applied, if one of the acid decomposer concentration detection device, the ultrahigh frequency partial discharge detection device and the ultrasonic partial discharge detection device monitors suspicious signals, the discharge amount in GIS equipment can be judged according to the following steps:
(1) discharging metal particles:
the signal value detected by the ultrahigh frequency partial discharge device is higher than a background value, the discharge signal is regular in an ultrasonic pulse detection mode and is in a triangular hump shape, and the monitoring map preliminarily judges that metal particles are discharged, SF6If the concentration of the acidic decomposition products is more than 0.1 mug/L, judging that the accumulated charge amount of the partial discharge is more than 100 pC;
(2) suspension potential discharge:
the ultrahigh frequency partial discharge device detects that a discharge signal has certain symmetry, the pulse amplitude is large, the adjacent discharge time intervals are basically consistent, and in an ultrasonic continuous detection mode, a discharge map has strong 100Hz frequency correlation and is preliminarily judged to be suspension potential discharge, SF6If the concentration of the acidic decomposition product is more than 1.5 mug/L, judging that the accumulated charge amount of the partial discharge is more than 1 mug C;
(3) air gap discharge:
the discharge signal detected by the ultrahigh frequency partial discharge device has certain symmetry, the amplitude of the discharge signal is dispersed, the discharge frequency is less, the ultrasonic partial discharge detection device is insensitive to the discharge signal, and the air gap discharge and SF (sulfur hexafluoride) are preliminarily judged6If the concentration of the acidic decomposition product is more than 1.0 mug/L, judging that the accumulated charge amount of the partial discharge is more than 0.1 mug C;
(4) discharging a metal tip:
the discharge polarity detected by the ultrahigh frequency partial discharge device is very obvious, the discharge amplitude dispersibility is small, and the discharge map has strong 50Hz frequency correlation in an ultrasonic continuous detection mode, and the metal point discharge and SF are preliminarily judged to be metal point discharge6And if the concentration of the acidic decomposition product is more than 0.5 mug/L, judging that the accumulated charge amount of the partial discharge is more than 0.01 mug C.
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| CN111537496A (en) * | 2020-05-20 | 2020-08-14 | 四川大学 | Titration analyzer based on point discharge atomic emission spectrometry detection |
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| CN112326784B (en) * | 2020-09-28 | 2022-10-11 | 国网天津市电力公司电力科学研究院 | Passive detection device and detection method for gas decomposition products in SF6 mutual inductor |
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| CN114220638B (en) * | 2021-11-23 | 2024-06-25 | 国网山西省电力公司电力科学研究院 | High-voltage outlet device for extra-high voltage transformer and reactor and fault diagnosis method thereof |
| CN115542101A (en) * | 2022-11-30 | 2022-12-30 | 杭州兆华电子股份有限公司 | Voiceprint preprocessing method of transformer voiceprint detection system |
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