CN106569107A - Partial discharge determining method combining sulfur hexafluoride centralized analysis and ultrahigh frequency - Google Patents

Abstract

A method for centralized analysis of sulfur hexafluoride combined with ultra-high frequency to judge partial discharge, including: online centralized sampling of sulfur hexafluoride gas in GIS equipment adjacent to multiple intervals; online centralized chromatographic analysis device for decomposition products Online chromatographic analysis of the sampled decomposition products; when suspicious signals are monitored by the online centralized chromatographic analysis device or the online UHF partial discharge device of the decomposition products, the latent partial discharge in the GIS equipment can be accurately predicted. The method adopts concentrated analysis of sulfur hexafluoride and combined with ultra-high frequency to judge partial discharge. The system includes GIS equipment (1) filled with sulfur hexafluoride gas, gas intake valve (2) of GIS equipment, and online centralized chromatographic analysis of decomposition products. Analysis device (3), monitoring data processing and analysis background (4) and online UHF partial discharge device (5). The invention is applicable to GIS electrical equipment using sulfur hexafluoride as the insulation and arc extinguishing medium, and can monitor the discharge type, discharge position and discharge volume of the partial discharge of the GIS equipment in real time.

Description

A method for centralized analysis of sulfur hexafluoride combined with UHF to judge partial discharge

technical field

The invention relates to a method for judging the partial discharge of GIS equipment by combining on-line centralized chromatographic analysis of sulfur hexafluoride decomposition products and on-line UHF partial discharge analysis, belonging to the technical field of on-line detection of substations.

Background technique

With the increasing number of gas-insulated metal-enclosed switchgear (GIS), the amount of sulfur hexafluoride gas is also increasing. As one of the defects in the operation of gas-insulated high-voltage electrical equipment, the partial discharge of the internal components of GIS equipment will not only affect the insulation strength of the equipment, but also cause unplanned power outages and affect the safety of the power grid. Therefore, it is very important to judge the detection work of partial discharge of GIS equipment.

For the power equipment with partial discharge in the GIS substation, the power industry mainly adopts offline UHF and ultrasonic live detection, and assists in the detection of sulfur hexafluoride gas decomposition products, so as to judge whether there is discharge in the equipment; some substations have installed Online UHF sensors, but they all consider whether there is partial discharge from the aspect of electrical quantity, which inevitably has one-sidedness and inaccurate testing, and there is no other means to confirm each other. The current detection methods are difficult to accurately predict the latent partial discharge in GIS equipment, and fail to promptly and effectively kill equipment failures in the bud, especially the online chromatographic analysis of sulfur hexafluoride decomposition products has not yet been carried out. Detection Technology.

Based on the above situation, a method of combining on-line centralized chromatographic analysis of sulfur hexafluoride decomposition and on-line UHF partial discharge analysis to judge the partial discharge of GIS equipment can solve this problem well. Centralized sampling of sulfur hexafluoride gas in GIS equipment at close intervals, and then online chromatographic analysis of decomposition products, and combining the detection results with online UHF partial discharge analysis results, to find a method that can reflect the GIS directly. The discharge type, discharge location, discharge volume, etc. of the partial discharge of the equipment.

Contents of the invention

The purpose of the present invention is to solve the problems existing in the partial discharge detection of the existing judgment GIS equipment, and the present invention discloses a method for centralized analysis of sulfur hexafluoride combined with UHF to judge the partial discharge.

The technical scheme of the present invention is as follows, a method for centralized analysis of sulfur hexafluoride combined with UHF to judge partial discharge, including:

On-line concentrated sampling of sulfur hexafluoride gas in adjacent multiple intervals of GIS equipment.

The on-line centralized chromatographic analysis device for decomposition products conducts online chromatographic analysis on the sampled decomposition products.

When suspicious signals are detected by the centralized chromatographic analysis device of decomposition products or the online UHF partial discharge device, the latent partial discharge in the GIS equipment can be accurately predicted.

The method adopts centralized analysis of sulfur hexafluoride and combined with UHF to judge partial discharge. The system includes GIS equipment filled with sulfur hexafluoride gas, gas intake valve of GIS equipment, online centralized chromatographic analysis device for decomposition products, and monitoring data processing And analyze the background and online UHF partial discharge device. The gas intake valve of GIS equipment is connected to the GIS equipment filled with sulfur hexafluoride gas through pipelines; and the collected F ₆ S gas samples are transported to the decomposition product online centralized chromatographic analysis device through the pipeline for analysis; the decomposition product online centralized chromatographic analysis device Send the analysis results to the monitoring data processing and analysis background; the online UHF partial discharge device installed in the GIS equipment filled with sulfur hexafluoride gas is connected to the monitoring data processing and analysis background through wires; the experts in monitoring data processing and analysis background The diagnosis system software can accurately predict the latent partial discharge in the GIS equipment, and monitor the discharge type, discharge location, and discharge volume of the partial discharge of the GIS equipment in real time.

The prediction includes whether the equipment in the GIS has partial discharge or the type of discharge:

(1) Free metal particle discharge: When the signal value tested by the online UHF partial discharge device is higher than the background value, and the monitoring map is initially judged to be free metal particle discharge, the SO ₂ , SO ₂ If both F ₂ and SOF ₂ are greater than 0.5µL/L and contain metal fluoride, it is judged as free metal particle discharge;

(2) Suspension potential discharge:

When the discharge pulse amplitude tested by the online ultra-high frequency partial discharge device is stable and the value is large, and the discharge map is initially judged to be a suspension potential discharge, the SO ₂ , SO ₂ F ₂ and SOF ₂ of the decomposition products monitored by the online centralized chromatographic analysis device are all greater than 1.0µL/L, and the content of SOF ₂ is greater than SO ₂ F ₂ , then it is judged to be a floating potential discharge;

(3) Internal air gap or surface discharge of insulating parts:

When the discharge pulse amplitude measured by the online ultra-high frequency partial discharge device has a large dispersion, and the discharge map is initially judged to be the internal air gap or discharge along the surface of the insulating part, the SO ₂ and SO ₂ F of the decomposition products monitored by the online centralized chromatographic analysis device ₂ and SOF ₂ are both greater than 0.5µL/L, and contain CF ₄ , it is judged as air gap or surface discharge inside the insulation;

(4) Metal tip discharge:

When the discharge time interval tested by the online UHF partial discharge device is uniform, the number of discharges is large, and the graph is preliminarily judged to be metal tip discharge, the decomposition products of SO ₂ , SO ₂ F ₂ and SOF ₂ monitored by the online centralized chromatographic analysis device are all If it is greater than 1.0µL/L, and the content of SOF ₂ is larger than SO ₂ F ₂ and contains metal fluoride, it is judged as metal tip discharge.

The online UHF partial discharge device is an online UHF partial discharge sensor installed on the inner pipe wall of the GIS equipment; the online centralized chromatographic analysis device for decomposition products is a concentrated analytical chromatograph for sulfur hexafluoride decomposition products.

The beneficial effect of the present invention is that the present invention is used for the combination of on-line centralized chromatographic analysis of sulfur hexafluoride decomposition products and on-line ultra-high frequency partial discharge analysis to judge the partial discharge of GIS equipment, and can perform the detection of sulfur hexafluoride gas in the GIS. Concentrate sampling, then conduct online chromatographic analysis of decomposition products, and combine the detection results with online UHF partial discharge analysis results to accurately predict the latent partial discharge in GIS equipment, and promptly and effectively kill equipment failures budding stage.

The invention is applicable to GIS electrical equipment using sulfur hexafluoride as the insulation and arc extinguishing medium, and can monitor the discharge type, discharge position and discharge volume of the partial discharge of the GIS equipment in real time.

Description of drawings

Fig. 1 is a schematic diagram of a device for centralized analysis of sulfur hexafluoride of the present invention and combined with UHF to judge partial discharge;

In the figure, 1 is the GIS equipment filled with sulfur hexafluoride gas; 2 is the gas intake valve of the GIS equipment; 3 is the online centralized chromatographic analysis device for decomposition products; 4 is the monitoring data processing and analysis background; put the device.

detailed description

The present invention will be described in detail below in conjunction with the embodiments and with reference to the accompanying drawings.

As shown in FIG. 1 , this embodiment is a method for centralized analysis of sulfur hexafluoride combined with UHF to determine partial discharge, including online centralized sampling of sulfur hexafluoride gas in adjacent multiple intervals of GIS equipment.

The centralized chromatographic analysis device for decomposition products conducts online chromatographic analysis on the sampled decomposition products.

When suspicious signals are detected by the centralized chromatographic analysis device of decomposition products or the online UHF partial discharge device, the latent partial discharge in the GIS equipment can be accurately predicted.

In this embodiment, a system for centralized analysis of sulfur hexafluoride combined with UHF to judge partial discharge includes GIS equipment 1 filled with sulfur hexafluoride gas, gas intake valve 2 of GIS equipment, and online centralized chromatographic analysis device 3 for decomposition products . Monitoring data processing and analysis background 4. Online UHF partial discharge device 5.

Adjacent GIS equipment 1 filled with sulfur hexafluoride gas at multiple intervals takes out the gas through the gas sampling valve 2 of the GIS equipment, and transports these gas samples to the decomposition product on-line centralized chromatographic analysis device 3 on the monitoring platform through pipelines , these F ₆ S gas samples will enter the chromatograph for analysis according to the set program, and the data output ports of the online centralized chromatographic analysis device 3 and the online UHF partial discharge device 5 are connected to the monitoring data processing and analysis background 4 for monitoring , on the background of monitoring data processing and analysis, an expert diagnosis system is installed to judge the partial discharge of GIS equipment by combining the analysis data of the decomposition product online centralized chromatographic analysis device and the online UHF partial discharge device. The discharge can be accurately predicted, and the discharge type, discharge location, and discharge volume of the partial discharge of the GIS equipment can be monitored in real time.

In this embodiment, the online UHF partial discharge device is an online UHF partial discharge sensor; the online centralized chromatographic analysis device for decomposition products is a centralized analytical chromatograph for sulfur hexafluoride decomposition products.

As shown in Figure 1, the location where the concentrated analysis chromatograph for sulfur hexafluoride decomposition is installed is a monitoring platform shared by multiple adjacent intervals of the GIS equipment. The sulfur hexafluoride gas in these intervals is concentrated in the monitoring platform, and the chromatograph is in a fixed board room equipped with air conditioning; on the background of monitoring data processing and analysis, an online centralized chromatographic analysis data of sulfur hexafluoride decomposition and an online UHF partial discharge analysis data phase are installed. Combined with the expert diagnosis system for judging the partial discharge of GIS equipment, the online UHF partial discharge sensor is installed on the pipe wall in the GIS equipment.

Claims (4)

1. a kind of sulfur hexafluoride concentrates analysis and the method that judgement office puts is combined with superfrequency, it is characterised in that methods described bag Include：

Sulfur hexafluoride gas in the GIS device at adjacent multiple intervals are carried out with online concentration to sample；

Catabolite concentrates online chromatographic analysis device to carry out on-line chromatograph analysis to the catabolite for sampling；

When device monitoring is put to questionable signal in concentration chromatographic analysis device online to catabolite or online superfrequency office, to GIS Latency shelf depreciation in equipment carries out accurate anticipation.

2. according to claim 1 a kind of sulfur hexafluoride concentrates analysis and the method that judgement office puts is combined with superfrequency, described The sulfur hexafluoride that method is adopted concentrates analysis and judgement office place system is combined with superfrequency includes that the GIS for filling sulfur hexafluoride gas sets Standby, GIS device gas take air valve, catabolite concentrate online chromatographic analysis device, Monitoring Data process and analyze backstage and Device is put in online superfrequency office；GIS device gas takes the GIS device that air valve fills sulfur hexafluoride gas by pipeline connection；And By the F of collection₆S gas samples concentrate online chromatographic analysis device to be analyzed by Pipeline transport to catabolite；Catabolite exists Line concentrates chromatographic analysis device that analysis result is delivered to into Monitoring Data and processes and analyze backstage；It is arranged on and fills sulfur hexafluoride gas Online superfrequency office in GIS device puts device and connects Monitoring Data process by wire and analyze backstage；Monitoring Data process And the expert diagnostic system software on analysis backstage, accurate anticipation is carried out to the latency shelf depreciation in GIS device, and supervise in real time Survey electric discharge type, discharge position and the discharge capacity size of GIS equipment partial discharge.

3. according to claim 1 a kind of sulfur hexafluoride concentrates analysis and the method that judgement office puts is combined with superfrequency, described Anticipation includes whether the equipment in GIS occurs the affiliated type of shelf depreciation or electric discharge：

（1）Free metal particle discharges：When signal numerical value that device to test goes out is put higher than background value, monitoring figure in online superfrequency office When spectrum is tentatively judged as that free metal particle discharges, catabolite concentrates online the SO that chromatographic analysis device is monitored₂、SO₂F₂With SOF₂0.5 L/L is all higher than, and contains metal fluoride, be then judged as that free metal particle discharges；

（2）Floating potential discharge：

When online superfrequency office puts, the discharge pulse amplitude stability that device to test goes out, numerical value are larger, and electric discharge collection of illustrative plates is tentatively judged as During floating potential discharge, catabolite concentrates online the SO that chromatographic analysis device is monitored₂、SO₂F₂And SOF₂1.0 L/L are all higher than, And SOF₂Content compare SO₂F₂Greatly, then it is judged as floating potential discharge；

（3）Insulating part internal air gap or creeping discharge：

When online superfrequency office puts, the discharge pulse amplitude dispersiveness that device to test goes out is larger, and electric discharge collection of illustrative plates is tentatively judged as insulation When part internal air gap or creeping discharge, catabolite concentrates online the SO that chromatographic analysis device is monitored₂、SO₂F₂And SOF₂It is all higher than 0.5 L/L, and contain CF₄, then it is judged as insulating part internal air gap or creeping discharge；

（4）Metal tip is discharged：

When online superfrequency office puts, the discharge time interval that device to test goes out is uniform, and discharge time is more, and collection of illustrative plates is tentatively judged as When metal tip is discharged, catabolite concentrates online the SO that chromatographic analysis device is monitored₂、SO₂F₂And SOF₂1.0 L/L are all higher than, And SOF₂Content compare SO₂F₂Greatly, containing metal fluoride, then it is judged as that metal tip is discharged.

4. according to claim 1 a kind of sulfur hexafluoride concentrates analysis and the method that judgement office puts is combined with superfrequency, described Online superfrequency office puts device and puts sensor to be mounted on GIS device inner tubal wall online superfrequency office；The catabolite is online Chromatographic analysis device is concentrated to be that sulfur hexafluoride decomposer concentrates analytical chromatograph.