Automatic tripping device and method adopting optical-fiber infrared control over thermal failure of power isolating switch

Abstract

The invention relates to an automatic tripping device and method adopting optical-fiber infrared control over the thermal failure of a power isolating switch. The device comprises an isolating switch, a circuit breaker, an infrared temperature measuring sensor with an infrared temperature measuring probe, an AD converter, a tripping device, an optical fiber and a control cable, wherein the isolating switch and the circuit breaker are electrically connected through a high-voltage conducting wire, the infrared temperature measuring sensor is used for detecting the contact temperature when the isolating switch is turned on, and the tripping device is used for controlling the circuit breaker to trip on load; the tripping device comprises a tripping coil and a control module which is connected with the tripping coil through the control cable. The contact temperature when the isolating switch is turned on is detected by the infrared temperature measuring sensor with the infrared temperature measuring probe in real time, the temperature data is compared with a threshold temperature set in the control module, whether the contact temperature is abnormal or not is judged, and on-off of the circuit breaker is controlled, so that on-off of the isolating switch is control indirectly, and power accidents are effectively prevented from occurring.

Description

technical field [0001] The invention relates to an optical fiber infrared control automatic tripping device and method for thermal failure of a power isolating switch. Background technique [0002] The electric high-voltage isolating switch will generate heat due to the electromagnetic effect during operation. When the contacts are not in good contact or the isolating switch is overloaded and other faults, the contacts of the electric high-voltage isolating switch will be abnormally heated. When the temperature exceeds a certain range, if Failure to take measures to trip the circuit breaker connected to the isolating switch to cut off the power supply will cause the isolating switch to burn out due to overheating, and even cause the danger of expanding the power grid accident. The method of detecting poor contact of traditional high-voltage isolating switches that is widely used now is to conduct a DC resistance test by the tester during a power outage to check whether there...

AI Technical Summary

Problems solved by technology

Poor contact heating or overload heating of traditional electric high-voltage isolating switches cannot realize real-time continuous online detection and automatic tripping, and are affected by human factors of the operator, especially for sudden overheating failures of electric high-voltage isolating switches, which may cause Power high-voltage isolating switch is damaged due to overheating, and even a serious accident that endangers the safety of the power grid

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