Online monitoring device for water content of SF6 gas in high-voltage switch electrical equipment

Abstract

An online monitoring device for water content of SF6 gas in high-voltage switch electrical equipment is characterized by mainly comprising a module power supply, three signal processing amplification circuits, multi-way switches, an A / D (analog to digital) converter, a single chip microcomputer, a communication conversion circuit as well as two temperature sensors, three pressure transducers, three humidity sensors and the like which can simultaneously measure three SF6 gas chambers in an A-phase transfer high-voltage switch, a B-phase transfer high-voltage switch and a C-phase transfer high-voltage switch. The device has the advantages as follows: 1, inconvenient and inaccurate traditional monitoring mode with operation risk due to the fact that instruments such as an electrolysis instrument, a condensation instrument and the like are required to be taken to the field for measurement can be changed, and online monitoring and remote monitoring are realized; 2, the measurement sensors are corrected and compensated by circuits in the transducers, the output linearity is good, and the humidity accuracy is one time higher than the national standard; 3, the device is suitable for the high-frequency electric field environment and the outdoor environment; and 4, SF6 gas emission is greatly reduced, the body health of a worker is guaranteed, and the environment pollution is reduced.

Description

technical field [0001] The invention relates to an online state monitoring device for high-voltage switching electrical equipment, in particular to an online monitoring device for the water content of SF6 gas in equipment containers such as high-voltage circuit breakers and GIS, and belongs to the technical field of electric equipment measurement. Background technique [0002] SF6 gas is an inert gas with good insulation and arc extinguishing properties. Its advantages are more and more recognized by people, and it has been widely used in high-voltage circuit breakers, GIS and other equipment in the past two decades. When the water content of SF6 gas reaches a certain level, under the action of electric charge, its decomposition products produce some toxic and harmful gases through hydrolysis reaction; at the same time, SF6 gas is the main gas that produces the greenhouse effect. A large number of high-voltage circuit breakers and GIS and other equipment are mostly working o...

AI Technical Summary

Problems solved by technology

[0003] 1) It is necessary to take the dew point meter to the site for measurement frequently. Each measurement must be carried out one by one. The on-site measurement personnel must do a good job of manual records, statistics, and comparisons. It cannot be done online, and remote monitoring cannot be realized.

[0004] 2) Every measurement must discharge a certain amount of SF6 gas from the gas container of the high-voltage switchgear equipment, which poses a serious threat to environmental pollution and personnel health

[0005] 3) On-site surveyors need to bring dew point meter and other equipment to the site of high-voltage electrical appliances to measure one by one. Each measurement data is unstable, and there may be several changes in a day

Therefore the measurement is inaccurate and the precision is poor

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