Method and device for judging SF6 electrical equipment malfunction by utilizing SF6 pressure fluctuation

Abstract

The invention relates to a method and a device utilizing sulphur hexafluoride pressure oscillation to judge the failure of high-voltage sulphur hexafluoride electric installation. The method comprises the following steps: a sensor which is installed in an SF6 chamber of the equipment in advance and a digital signal processing device consisting of a later-period circuit detect the gas change condition in the chamber so as to obtain information of inside pressure, temperature raising, humidity, and the like; once gas failure occurs inside the equipment to cause certain item or a plurality of items of parameters to raise to a certain limit, the digital signal processing device can send out an alarm signal to prompt the possible occurrence of equipment failure, therefore, failure can be discovered in the earlier period. The digital signal processing device used for realizing the method comprises a signal conditioning module, a main control module and an output display module, can monitor the valuable state parameters of the SF6 gas, has the advantages of simple and reliable structure, little interference, good economical efficiency, high application value, and the like, and meets the actual need of the electric power system and the requirements of the development of modern industry.

Description

technical field [0001] The invention belongs to the technical field of electric power equipment, and relates to a method and device for fault monitoring of high-voltage electrical equipment, especially a 6 ) method and device for judging the failure of high-pressure sulfur hexafluoride electrical equipment by pressure fluctuations. Background technique [0002] Sulfur hexafluoride (SF 6 ) has excellent electrical insulation and arc extinguishing properties, and is considered to be the most ideal gas insulation and arc extinguishing medium so far. SF 6 The unique properties of the gas make the electrical equipment using it as an insulating arc extinguishing medium have high dielectric strength, strong arc extinguishing ability, large breaking capacity, fire and explosion protection, small size, small footprint and space, light weight, low noise, Low operating temperature, easy installation, safe and reliable fully sealed electrical appliances, no oxidation problems, long m...

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Problems solved by technology

Except for Mitsubishi's Hybrid Sensor, the above products do not have a fault diagnosis function, but Mitsubishi's Hybrid Sensor uses the content of decomposed gas to determine whether there is a fault in the equipment, and the detection of decomposed gas is more difficult , and its diffusion is affected by the installation position of the sensor. According to the installation position of the current density relay, it is difficult to detect the decomposition products when the sensor is installed, and the transmission of pressure is almost independent of the installation position. The time of detecting pressure fluctuations is almost synchronized with the time of failure

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