SF6 gas density and micro-water on-line monitoring device

Abstract

The invention discloses an SF6 gas density and micro-water on-line monitoring device, which includes a sampling gas chamber and a ventilation interface. The inside of the sampling gas chamber is equipped with a dew point sensor, a temperature sensor and a pressure sensor. The ventilation interface is in tight connection with an inflation inlet of monitoring equipment through a locking nut. Semiconductor refrigeration pieces are disposed outside the sampling gas chamber, and the temperature difference between the sampling gas chamber and a monitoring equipment gas chamber is generated by means of refrigeration and heating so as to promote circulatory flow of the gas between a ventilation pipe and a bunch of capillary tubes connecting the two gas chambers, thus ensuring sufficient exchange of the SF6 gas between the sampling gas chamber and the monitoring equipment gas chamber. The monitoring device really realizes on-line monitoring of the SF6 gas state, and solves the defect of inaccurate measured values resulted from lack of gas exchange between gas chambers in existing on-line monitoring devices.

Description

technical field [0001] The invention relates to an online monitoring SF 6 The device of gas density and micro-water content is especially suitable for long-term and stable monitoring of insulating gas SF of high-voltage equipment 6 gas state. Background technique [0002] SF 6 As an important insulating medium, gas is widely used in high-voltage electrical equipment because of its good insulating properties and arc extinguishing properties. But in the device SF 6 Whether the three physical indicators of gas density, humidity and temperature are within the rated range will affect the safe operation of the equipment. The power grid operating regulations stipulate that the density and water content of SF6 gas must be tested regularly before the equipment is put into operation and during operation. The current common monitoring methods are off-line micro-water detection and mechanical meter density monitoring. [0003] SF 6 The off-line monitoring of micro-water often use...

AI Technical Summary

Problems solved by technology

[0005] For the deficiencies of existing SF6 density and micro-water online monitoring equipment, the technical problems to be solved in the present invention are: 1) the gas between the sampling gas chamber and the equipment gas chamber of the existing density micro-water online monitoring device cannot be fully exchanged, so The measured density and moisture content cannot truly reflect the SF in high-pressure equipment 6 state of gas

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