A temperature detection method for bus joints of gas insulated switchgear

Abstract

The invention provides a temperature detection method for a busbar joint of gas insulation switch equipment. The temperature detection method comprises the steps of determining the distance between a contact and an insulation spacer and the temperature rise most-sensitive point, corresponding to the busbar joint, of the shell surface of a busbar of the gas insulation switch equipment; acquiring the load current, the environment temperature and the temperature of the temperature rise most-sensitive point of the equipment busbar and the distance between the contact and the insulation spacer; obtaining the functional relationship between the joint temperature of the equipment busbar, the load current, the environment temperature and the temperature of the temperature rise most-sensitive point of the equipment busbar and the distance between the contact and the insulation spacer; detecting the temperature of the three-phase busbar joint of the equipment. By means of the temperature detection method, on-line detection of the temperature of the busbar joint of the gas insulation switch equipment can be achieved, power failure detection of a GIS is not needed, the detection result is not influenced by external environment factors, modification of the equipment structure is not needed, the safety and the feasibility are high, busbar joints of different voltage classes in a transformer substation can be detected at the same time, and detection automation can be conveniently achieved.

Description

technical field [0001] The invention relates to the technical field of temperature detection of electrical equipment busbar joints, in particular to a DC and low-frequency magnetic field signal detection device. Background technique [0002] Compared with traditional open substations, gas insulated switchgear has the advantages of less land occupation, high reliability, no pollution, convenient maintenance, and long service life. Competitive equipment has been widely used in power transmission and distribution systems at home and abroad. However, faults such as overheating or even burning of the busbar due to excessive contact resistance of the joints of the gas insulated switchgear have seriously affected the reliability and stability of the grid power supply. [0003] Aiming at the problem of failure caused by overheating of gas-insulated switchgear busbar joints, the general measurement methods currently mainly used include regular loop resistance detection, partial disc...

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Problems solved by technology

The method of measuring loop resistance cannot be used for live detection, and this method of measuring the resistance between the main circuit such as the bushing and the grounding switch, if the decomposition measurement is not carried out, there will be great uncertainty, that is, the number of faulty joints cannot be determined and the The problem with the location of the faulty connector

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 imaging camera for inspections may not be able to detect changes in the temperature rise of the contacts due to the presence of SF6 gas between the busbar contacts and the housing, so the temperature measurement accuracy and sensitivity are low. The temperature measurement results of this method It is easy to be affected by environmental factors and detection distance, so it is difficult to capture fault characteristics, and this method is difficult to realize the integrated integration of online monitoring system. Even if there is a defect of contact deterioration, it requires operators to have rich experience to make correct judgments

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