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Method for positioning discharging fault in gas insulated switchgear (GIS)

A discharge and fault technology, applied in the field of detection, can solve the problems of insulation breakdown, threats to the safety of power production, and high working field strength of insulation equipment

Inactive Publication Date: 2013-10-09
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase in the installation and usage of GIS equipment, the problems in operation are gradually exposed. SF 6 The internal working field strength of insulation equipment is very high, and it is easy to reduce the insulation performance due to internal tiny defects, causing more serious partial discharge, or even insulation breakdown, resulting in equipment failure and seriously threatening the safety of power production

Method used

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  • Method for positioning discharging fault in gas insulated switchgear (GIS)
  • Method for positioning discharging fault in gas insulated switchgear (GIS)
  • Method for positioning discharging fault in gas insulated switchgear (GIS)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 1. Gas collection: the sampling device collects the gas sample from the gas source into the sampling container, which is composed of a vacuum pump and a connection system. The sampling container can be selected from 0.5L-1.0L PTFE-coated stainless steel with a three-way device Steel cylinder or 1.0L sampling bag; connecting pipelines are connected by polytetrafluoroethylene tubes, and there should be matching joints for sampling on electrical equipment; check the sampling device and connecting pipelines before sampling to keep them clean and dry; the connecting pipelines are sealed good.

[0058] Specific sampling method:

[0059] a) press figure 1 Connect the sampling container to the gas source and vacuum pump.

[0060] b) Close valve a, open valve b, rotate the three-way valve, connect the sampling container to the vacuum pump, start the vacuum pump, and vacuum the sampling system for 2-5 minutes until the system pressure drops to -0.1MPa.

[0061] c) Close valve ...

Embodiment 2

[0088] A 500kV GIS used other methods to detect and found that there were SO 2 +SOF 2 Components, H was not detected in all cells 2 S and HF components. Routine follow-up detection found that the components had an increasing trend, as shown in Table 2.

[0089] Table 2 Test records of SF6 decomposition products in GIS of a certain station

[0090]

[0091]

[0092] Preliminary analysis shows that the decomposition of No. 2 gas chamber has increased significantly, and it is judged that there is a continuous partial discharge inside, and it is recommended to disassemble and repair to eliminate defects.

[0093]Due to the huge impact of the power outage, the method of the present invention is used for detection and comparison to analyze whether there is discharge.

[0094] Adopt on-the-spot detection tube sampling analysis of the present invention and send laboratory chromatographic detection, table 3 is the on-site use decomposition product detection tube test result, ...

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Abstract

The invention belongs to the technical field of detection and in particular relates to a method for positioning a discharging fault in a gas insulated switchgear (GIS). The method comprises the following steps of: sampling, performing field detection and performing laboratory detection, wherein the step of performing laboratory detection comprises the sub-steps of gas sampling, component detection, performing chromatographic column separation and detection of a detector on samples, recording the peak area or peak height of different components, calculating concentration of each component, and positioning the discharging fault in GIS according to sulfur hexafluoride (SF6) gas components in the GIS and the calculated concentration of each component. According to the method, an SF6 decomposer in the GIS is detected, and internal conditions of GIS equipment are judged, so that the GIS is subjected to fault gas chamber positioning, a latent fault in the equipment is subjected to tracking monitoring, the detection range is narrowed, the detection time is shortened, and a novel detection means is provided for fault diagnosis of the GIS equipment.

Description

technical field [0001] The invention belongs to the technical field of detection, and in particular relates to a method for locating discharge faults inside a GIS. The method detects SF 6 The decomposed product can locate the fault chamber of GIS and track and monitor the latent fault in the equipment, which provides a new detection method for GIS equipment fault diagnosis. Background technique [0002] SF 6 The gas has excellent insulation and arc extinguishing properties, and is widely used in high-voltage electrical equipment, especially in combined electrical appliances and circuit breaker equipment. Pure SF 6 The gas is a colorless, odorless, non-toxic, non-flammable inert gas. Its own decomposition temperature is >500°C. Under normal operation, the decomposition products are very few. When the temperature is 200°C on the metal surface, it can also promote the decomposition of sulfur hexafluoride. . cause SF 6 The main reasons for gas decomposition are: partial ...

Claims

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Application Information

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IPC IPC(8): G01N30/88G01N1/22
Inventor 高凯徐红彭伟倪浩姚明
Owner STATE GRID CORP OF CHINA
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