SF6 electrical equipment state detection method and simulation detection device

A technology for electrical equipment and detection devices, applied in the electrical field, can solve the problems of missing the best time to deal with equipment defects, inconsistent internal states of electrical equipment, and inability to capture in time, so as to facilitate real-time monitoring, high reliability, Results-sensitive effects

Active Publication Date: 2015-12-23
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CF 4 in SF 6 It exists in the production process and needs to be combined with SO 2 Indicators are used together, and SO 2 In the actual operation of equipment, there is often a sudden and violent increase. For the operation and maintenance personnel, it is likely that it cannot be captured in time, resulting in missing the best time to deal with equipment defects
Furthermore, CF 4 and SO 2 The composition of the decomposition products is complex, and the corresponding internal state of the electrical equipment is different. It is necessary to combine other markers to judge the internal state of the electrical equipment.

Method used

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  • SF6 electrical equipment state detection method and simulation detection device
  • SF6 electrical equipment state detection method and simulation detection device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Table 1 below lists several power stations in recent years in SF 6 The results of gas component analysis when electrical equipment fails can be seen from Table 1, except for the widely accepted CF 4 , SO 2 、SOF 2 , SO 2 f 2 In addition to other markers, there are some decomposition products, such as CO 2 、H 2 、CS 2 etc. have also increased significantly, for example, a large amount of CF was found in the 22035 switch of a 500KV station in Dongguan 4 , SO 2 , SO 2 f 2 , at the same time there is 2118.1μL / L of CO 2 , 100μL / L H 2 and 24.8 μL / L of CS 2 ; A large amount of CF was found in phase A of 4688 switch in a 220kV station in Shantou 4 , SO 2 、SOF 2 , at the same time, there is 864.2μL / L of CO 2 .

[0044] Table 1

[0045]

[0046] Note: Unit: μL / L.

[0047] It can be seen from Table 1 that the SF of some power stations 6 The carbon dioxide concentration of electrical equipment is abnormal, therefore, by detecting CO 2 The concentration can ref...

Embodiment 2

[0049] use as figure 2 The simulated detection device shown in the simulation experiment is carried out in the simulation experiment of metal wire discharge on the surface of solid insulation (defects are set on the surface of solid insulation, and the defects are set as image 3 shown), significant CO was detected 2 、SOF 2 and SO 2 For details, see Table 2 below. Among them, CO 2 It is generated when there is a discharge at the beginning, and the SOF 2 and SO 2 Then, a significant increase starts at 21 hours when obvious intermittent discharges are observed. It can be seen that when there is a partial discharge involving solid insulation inside the equipment, SF will be generated 6 Characteristic decomposition product CO 2 、SOF 2 and SO 2 . When it comes to defects such as surface damage of solid insulators, significant CO 2 , while significant intermittent spark discharges produce significant SOF 2 and SO 2 .

[0050] Table 2

[0051] pressurization...

Embodiment 3

[0056] In April 2014, it was found that CO in the 800KV wall bushing of a station 2 Concentrations are higher than in normal operating chambers. In view of the particularity of the wall bushing structure, the gas chamber is tracked every month, and the CO in the bushing 2 The concentration gradually increased from 292.7μL / L in April to 626.0μL / L in December. After 8 months of tracking, on December 15, 2014, the operation of the equipment deteriorated, SO 2 Increased from 6.9 μL / L to 18.6 μL / L within 2 days, and detected SOF of 7.5 μL / L 2 , the concentration increased sharply. It is suspected that there is partial discharge inside the equipment. It is recommended to disassemble and inspect after power failure. Disintegration found that there was discharge at the zero screen of the bushing capacitive screen, and the insulating medium had been burned.

[0057] See Table 3 below for specific decomposition product changes.

[0058] table 3

[0059]

[0060]

[0061] Note...

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Abstract

The invention relates to an SF6 electrical equipment state detection method and simulation detection device. The invention provides a new marker CO2 for detecting an SF6 electrical equipment state, which can be used as a gas maker to be applied to SF6 electrical equipment state detection. The new gas marker CO2 is discovered by analyzing gas components of faulted SF6 electrical equipment; the inner operation state of the SF6 electrical equipment can be effectively determined by detecting the CO2 concentration of contents of the SF6 electrical equipment. Compared with a traditional detection method of detecting gas markers such as CF4, SO2, SOF2, SO2F2, etc., the detection method of the invention is simpler, and can obtain more sensitive, effective and reliable results.

Description

technical field [0001] The invention relates to the electrical field, in particular to a SF 6 A detection method and a simulation detection device for the state of electrical equipment. Background technique [0002] Sulfur hexafluoride (SF 6 ) is a colorless, odorless, non-toxic, non-flammable and chemically stable synthetic gas at normal temperature and pressure. SF 6 The molecular structure of monosulfide polyfluorine is extremely strong electronegativity, which endows it with excellent electrical insulation and arc extinguishing properties. Currently, SF 6 As a new generation of insulating medium, it is widely used in high-voltage and ultra-high-voltage electrical equipment. Refill SF 6 electrical equipment (ie SF 6 Electrical equipment) occupies a small area, has low operating noise, and has no fire hazard, which greatly improves the safety and reliability of electrical equipment operation. [0003] SF 6 Under the action of overheating, electric arc, electric sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01N30/00
Inventor 王宇
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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