High-sensitivity multi-channel sf6 on-line leak detector and its detection method

Abstract

The invention discloses a high sensitive multipath SF6 on-line leak detector, comprises a gas washing chamber which has a gas outlet connected with a solenoid valve for washing gas; a gas collecting chamber which has a gas inlet connected with the solenoid valve for washing gas and a plurality of paths of samples, wherein gas path solenoid valves are arranged on the gas path between each path of samples and the gas collecting chamber; a suction pump which has a gas inlet connected with the gas outlet of the gas collecting chamber; a sensor gas chamber which has a gas inlet and a gas outlet connected respectively with solenoid valves for sensor, wherein the solenoid valve for sensor beside the gas inlet is connected with the gas outlet of the suction pump; an exhaust gas chamber which has a gas inlet connected with the solenoid valve for sensor beside the gas inlet of the sensor gas chamber; control circuits; and a sensor which is arranged inside the sensor gas chamber. The detector of the invention detects SF6 content in a real-time way and displays detection results. Multipath gas samples can be detected at the same time without switching off equipments and the paths of gas which need to be detected can be switched based on needs freely. Cleaning can be performed to the gas path of the leak detector and detection processes of different gas paths do not interfere mutually.

Description

technical field [0001] The invention relates to a detection system in the technical field of electric power engineering, in particular to an on-line detection instrument for SF6 leakage in a high-voltage substation and a detection method thereof. Background technique [0002] SF6 gas is widely used in power equipment because of its excellent arc extinguishing and good insulation capabilities, such as SF6 high voltage circuit breakers and SF6 closed combination switches. Pure SF6 at normal temperature is a non-toxic, odorless and transparent gas, but with the leakage of SF6 and the penetration of external moisture into the switchgear, the moisture content inside the equipment increases. Under the action of corona discharge, SF6 and H 2 The hydrolysis reaction of O will decompose a variety of toxic and harmful corrosive substances, such as HF, SOF2 and so on. Therefore, in the power equipment using SF6, the leakage of SF6 not only affects the operation performance of the swi...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a high-sensitivity multi-channel SF6 on-line leak detector and its detection method. Based on the absorption principle of infrared light of a specific wavelength by SF6 molecules, it solves the need for a built-in radiation source and high-purity argon in the electron capture detection (ECD) method. The defect and the problem that the local vacuum negative ion capture detection method (NIC) requires a high vacuum environment. It can detect multiple gas samples from different directions without switching off the power, and the detection sensitivity reaches 1ppm. It also has an automatic detection mode. And manual detection mode, real-time display of detection results, and automatic alarm when the gas content exceeds the allowable value

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