Built-in detection system for sulfur hexafluoride gas humidity

Abstract

The invention provides a built-in detection system for sulfur hexafluoride gas humidity. The system is characterized by comprising a tank body, a mirror type sulfur hexafluoride humidity density sensor, a motor, a magnetic coupling and a fan which is arranged in the tank body, wherein a safety valve, a pressure gauge, a vacuum meter, an air inlet, an air outlet and an adapter for installing the sulfur hexafluoride humidity sensor to be detected are arranged on the tank body; the mirror type sulfur hexafluoride humidity density sensor is arranged on the inner wall of the tank body; the air outlet is connected with a dew-point meter through a valve; the magnetic coupling is embedded into the tank body, an outer rotor of the magnetic coupling is connected with an output shaft of the motor, and an inner rotor of the magnetic coupling is fixedly connected with the fan. The mirror type built-in sulfur hexafluoride sensor adopts the cold mirror principle; when the temperature of a mirror is low enough, moisture in the gas is condensed to be dew on the mirror, the temperature of the dew condensed from the moisture in the gas on the mirror is directly measured, the temperature at the moment is a dew point, and the measurement is not affected by pressure in a container, so that the measurement is more accurate, and the reproducibility is good.

Description

technical field [0001] The invention provides a built-in detection system for the humidity of sulfur hexafluoride gas, which belongs to the technology of detection instruments for the humidity of sulfur hexafluoride gas. Background technique [0002] SF 6 Gas has been widely used in high-voltage electrical equipment due to its good insulating properties and arc-extinguishing properties. Thanks to SF 6 Gas manufacturing process, electrical equipment manufacturing and installation process, equipment leakage, adsorbent and other factors lead to SF 6 The moisture content in the gas increases, which increases the probability of flashover failure on the inner surface of the insulator; the insulation performance of the circuit breaker decreases due to moisture or condensation; SF 6 Moisture in the gas will participate in SF 6 The decomposition reaction of the gas produces highly corrosive decomposition products, which in turn corrode the metal components and sealing insulation ...

AI Technical Summary

Problems solved by technology

Thanks to SF 6 Gas manufacturing process, electrical equipment manufacturing and installation process, equipment leakage, adsorbent and other factors lead to SF 6 The moisture content in the gas increases, which increases the probability of flashover failure on the inner surface of the insulator; the insulation performance of the circuit breaker decreases due to moisture or condensation; SF 6 Moisture in the gas will participate in SF 6 The decomposition reaction of the gas produces highly corrosive decomposition products, which in turn corrode the metal components and sealing insulation materials in the electrical equipment, shortening the service life of the electrical equipment

[0003] At present, with the continuous development of domestic smart grid, SF is installed in a large number of electrical equipment 6 Gas humidity density detection device, most of these monitoring devices are external monitoring devices, the measurement accuracy is relatively low, and it is easily affected by pressure, resulting in a decrease in measurement accuracy

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