Online temperature detection method for three-phase box-sharing GIS (Gas Insulated Switchgear) bus joint

Abstract

The invention discloses an online temperature detection method for a three-phase box-sharing GIS (Gas Insulated Switchgear) bus joint. The online temperature detection method comprises the following steps: determining a temperature rise most sensitive point corresponding to the three-phase bus joint on the surface of a shell of a GIS bus; acquiring the radiuses of a conducting rod and the shell of the GIS bus, load current, ambient temperature and the three-phase temperature of the temperature rise most sensitive point; acquiring corresponding function relations among the joint temperature of an equipment bus, the radiuses of the conducting rod and the shell of the equipment bus, the load current, the ambient temperature and the three-phase temperature of the temperature rise most sensitive point; detecting the joint temperature of the three-phase bus joint. By adopting the online temperature detection method, the temperature of the GIS bus joint can be detected accurately on line without cutting off, and detection results are not influenced by the external environmental factors. The equipment structure does not need to be changed, and high safety and high practicability are realized. Moreover, the temperatures of a plurality of GIS bus joints in a transformer substation can be detected at the same time, and convenience is brought to detection automation.

Description

[0001] technical field [0002] The invention relates to the technical field of temperature detection of electric power equipment, in particular to an online temperature detection method of a three-phase common box type GIS bus joint. Background technique [0003] Three-phase common box GIS (Gas Insulated Switchgear, gas insulated switchgear) achieves the purpose of reducing the size of the equipment and improving the operation reliability by sealing the three-phase conductors in the same metal barrel filled with SF6 insulating gas. With the GIS A large number of them have been put into use, and accidents caused by overheating of GIS bus joints due to poor contact have occurred from time to time, which has become one of the typical faults of this type of equipment. From the overheating fault mechanism of GIS bus joints, it can be seen that it is a long-term process for GIS bus joints to heat up due to poor contact until an accident occurs. [0004] Aiming at the problem of ...

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Problems solved by technology

The method of measuring loop resistance cannot carry out on-load detection, and there are problems that the number of faulty joints and the location of faulty joints cannot be determined

Partial discharge detection methods are difficult to formulate effective fault criteria, and the relationship between overheating and partial discharge needs to be further studied. As far as the field operation is concerned, there is a phenomenon that the partial discharge signal cannot be detected when the bus joint is overheated

The method of regularly using a hand-held infrared thermal imager for inspections can only detect the surface temperature of the busbar shell, and judge whether the internal joints of the busbar are overheated by comparing the shell temperature with the normal value and the temperature of the surrounding parts of the busbar. The detection results of this method are affected by the weather conditions And the impact of human factors is relatively large, so it is difficult to capture fault characteristics

Another infrared temperature detection method is to place the infrared probe inside the busbar of the gas insulated switchgear to realize the direct detection of the joint temperature. This method needs to modify the structure of the busbar shell, and it is not feasible for the GIS equipment that has been put into operation.

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