Live-line detection method for overheating fault of GIS contact

Abstract

The embodiment of the invention provides a live-line detection method for an overheating fault of a GIS contact, and relates to the technical field of temperature detection of a metal conductor of GIS equipment. The method can judge whether a GIS inner contact has an overheating fault or not through the distribution gradient of temperature of a GIS housing, can complete the measurement under the live-line condition, and guarantees the economical operation of equipment. The specific scheme of the invention is that the method comprises the steps: collecting the temperature values of K temperature measurement points on the GIS housing through a temperature sensor, wherein K is an integer which is greater than one; determining the actual measurement values of the characteristic quantities of temperature distribution of the GIS housing according to the collected K temperature values; comparing the actual measurement values of the characteristic quantities with standard values of the characteristic quantities, and determining that the GIS contact has the overheating fault when the difference exceeds a preset tolerance value, wherein the standard values of the characteristic quantities are measured when the GIS operates normally and are stored in advance. The method is used for the detection of the overheating fault of the GIS contact.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of temperature measurement of metal conductors of GIS equipment, in particular to a live detection method for overheating faults of GIS contacts. Background technique [0002] Gas-insulated metal-enclosed switch (full name in English: Gas Instulated Switchgear, English abbreviation: GIS) is represented by SF 6 As an insulating medium, gas has the advantages of strong breaking capacity, low failure rate, low maintenance cost, and small footprint, and has been widely used in substations. [0003] When the GIS contact is in poor contact, its contact resistance becomes larger, and overheating will occur when the load current passes. Overheating of contacts and busbars will cause insulation aging or even breakdown, leading to major accidents and economic losses. According to incomplete statistics, the GIS equipment used by many power companies at home and abroad have experienced temperatur...

AI Technical Summary

Problems solved by technology

Manual observation of contact surface color and periodic measurement of loop resistance require GIS equipment to be powered off for maintenance, which is not conducive to the economic operation of the power grid

[0006] The second is that infrared imaging technology is a relatively common method for judging thermal faults of equipment on site. It is often used to judge the heating conditions of equipment such as exposed busbar joints and conventional isolating switches. Currently, there is no feasible solution for determining overheating faults of internal contacts in GIS.

[0008] In the prior art, although there are many GIS temperature measurement methods, none of them can complete the discrimination of the thermal fault of the GIS contact without power failure

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