Device and method for monitoring sulfur hexafluoride gas density

Abstract

A sulfur hexafluoride gas density monitoring device and method provided by the embodiments of the present invention uses a tuning fork-type quartz crystal oscillator to vibrate with sinusoidal signals at different frequencies to generate a current signal through a preamplifier, a lock-in amplifier, and a wireless data transmission module issued, and then use the linear response of the quality factor Q value of the tuning-fork quartz crystal oscillator under different sulfur hexafluoride gas densities to monitor the leakage of sulfur hexafluoride gas in electrical equipment in real time. The sulfur hexafluoride gas density monitoring method provided by the present invention uses the sulfur hexafluoride gas density monitoring device, so the sulfur hexafluoride gas density monitoring device and method provided by the embodiment of the present invention can save manual meter reading and save cost, improve the safety factor, and improve the ability to detect potential insulation faults.

Description

technical field [0001] The invention belongs to the technical field of gas density monitoring, and in particular relates to a sulfur hexafluoride gas density monitoring device and method. Background technique [0002] In high-voltage power systems, sulfur hexafluoride (SF 6 ) gas has outstanding gas insulation performance and arc extinguishing ability, and is often introduced into electrical equipment such as gas insulated switchgear (GIS) as an insulating medium, SF 6 The purity and density of the gas determine the insulation and arc extinguishing capabilities of GIS and other equipment. However, during the operation of high-voltage electrical equipment, SF 6 Gas leakage is a common equipment defect with major safety hazards, SF 6 Gas leakage will reduce the internal insulation strength of the equipment, causing unplanned power outages and even major safety accidents. Also due to SF 6 The greenhouse gas is carbon dioxide (CO 2 ) 20,000 times that of gas, SF 6 The lea...

AI Technical Summary

Problems solved by technology

However, during the operation of high-voltage electrical equipment, SF 6 Gas leakage is a common equipment defect with major safety hazards, SF 6 Gas leakage will reduce the internal insulation strength of the equipment, causing unplanned power outages and even major safety accidents

Also due to SF 6 The greenhouse gas is carbon dioxide (CO 2 ) 20,000 times that of gas, SF 6 The leakage of the leakage will produce a large greenhouse effect and cause pollution to the atmospheric environment. Therefore, it is necessary to regularly and multi-point the SF in the power system inspection equipment. 6 gas density

[0003] At present, in substations, mechanical temperature compensating SF is usually installed in GIS and other equipment. 6 Gas density pressure gauge is used to monitor whether the air pressure in the equipment is normal. This method requires manual meter reading, so there are disadvantages such as reading errors, and it is impossible to check the SF in the equipment. 6 Real-time long-term monitoring of gas pressure

In addition, the SF needs to be periodically 6 Density relay calibration to eliminate potential safety hazards, while SF 6 The connection mode between the density relay and the electrical equipment body should meet the requirements of not disassembling the density relay for verification, so the inspection of the density relay can only be carried out on site

Since the installation point of GIS and other equipment is relatively high from the ground, it is necessary to climb high for manual meter reading and observation, posing potential safety hazards

In addition, when checking the gas density meter, it is necessary to carry a bulky SF 6 Standard gas cylinder, SF 6 Gas density monitoring is a time-consuming and labor-intensive task with certain safety hazards, and the monitoring cost is relatively high

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