Isolation switch contact temperature on-line monitoring method

Abstract

The invention discloses an isolation switch contact temperature on-line monitoring method, which comprises the following steps: a) obtaining emissivity epsilon of an isolation switch contact; b) monitoring radiation power E of the isolation switch contact, and carrying out calculation according to the Stefan-BoLtzman law, E= epsilon sigma T<4>, to obtain absolute temperature T of the isolation switch contact, wherein the sigma is a Stefan-BoLtzman constant; and c) carrying out correction on the obtained absolute temperature T of the isolation switch contact and obtaining a temperature monitoring value of the isolation switch contact. The emissivity is a fixed value; under the condition of knowing the emissivity first, only by monitoring the radiation power of the isolation switch contact, the temperature monitoring value can be obtained after calculation and correction; the radiation power can be detected in real time without changing an isolation switch; the method is low in cost, high in reliability and convenient for being in large-area use in the production field; and the case of temperature rise of the isolation switch contact under the operation state can be found in time so as to deal with the case in time, thereby reducing safety hidden trouble.

Description

technical field [0001] The invention relates to the field of temperature monitoring, in particular to an on-line monitoring method for the contact temperature of an isolating switch. Background technique [0002] The isolating switch is a very important primary equipment in the substation. Due to equipment manufacturing, environmental pollution, foundation deformation, long-term operation, severe overload operation, contact oxidation, arc impact and other reasons, the isolating switch may fail to close or over-close when it is closed. And problems such as loose contacts, there are also safety hazards such as heating and rising temperature during operation. If not found and dealt with in time, it is easy to cause fire or explosion, resulting in a large amount of property loss. This problem is especially in areas with rapid load growth. universal. [0003] At the same time, as the voltage level of the power grid continues to increase, the requirements for power supply reliabi...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an on-line monitoring method for the temperature of the isolating switch contacts, which can solve the problem that the prior art measurement method cannot conduct point-to-point real-time monitoring of the isolating switch contacts in a large area due to high cost or low reliability. On-line monitoring makes it difficult to find out and deal with potential safety hazards caused by the temperature rise of the isolating switch contacts in time

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