Method for detecting and judging overheating fault of bus joint of gas insulation switch device

Abstract

The invention discloses a method for detecting and judging an overheating fault of a bus joint of a gas insulation switch device. The method comprises the following steps of: selecting three temperature measuring points on a shell of a bus, and respectively measuring the temperature of three-phase conductors in the bus; providing an ambient temperature detection point in a predetermined range of the shell so as to obtain the ambient temperature; comparing the temperature of the three-phase conductors and the ambient temperature so as to respectively obtain temperature rises of the three-phase conductors; when the temperature is greater than the predetermined maximum allowed temperature rise, judging as the overheating fault of the bus; otherwise, storing the temperature rises of the three-phase conductors, and obtaining a temperature difference change trend meter according to the stored temperature rises; when the temperature trend meter shows that the temperature rise is continuously increased in the predetermined time, judging as the overheating fault of the bus. By adopting the invention, the accurate on-line detection of the overheating fault of the bus is realized, a failure operation is unnecessary, a bus structure is not improved, and the method has good safety and reliability.

Description

technical field [0001] The invention relates to the field of electrical engineering, in particular to a method for detecting and judging an overheating fault of a bus joint of a gas insulated switchgear. Background technique [0002] Gas Insulated Switchgear (GIS) has the advantages of small footprint, high reliability, less maintenance, and long service life. It has been widely used in power transmission and distribution systems at home and abroad. However, due to the lack of strict quality control in manufacturing, on-site installation, and acceptance, the overheating or even burning of the GIS bus due to excessive contact resistance of the joints seriously affects the reliability and stability of the power supply of the power grid. [0003] When the contact of the gas-insulated switchgear busbar joints deteriorates, the contact heat loss increases and the temperature of the joints rises. The heat is mainly transferred from the joints to the busbar shell by natural convect...

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Problems solved by technology

[0004] At present, the infrared thermal imaging camera is mainly used in the operation site to conduct regular inspections on the gas insulated switchgear, and judge whether there is an overheating fault according to the comparison between the detected temperature and the temperature of the surrounding components. The disadvantages of this method are: ①The infrared thermal imaging camera cannot realize online It is difficult to detect hidden dangers in the early stage; ②The detection results are not only related to the detection distance and position, but also affected by the changing ambient temperature and load current, requiring inspection personnel to have rich operating experience and strong subjectivity; ③Lack of effective Fault Judgment Criteria

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