Method for online accurate humidity measurement of sulfur hexafluoride gas in GIS

Abstract

The invention provides a method for online accurate humidity measurement of sulfur hexafluoride gas in a GIS. SF6 gas in the GIS is automatically sampled and measured according to a specific measurement time interval requirement, and a result is transmitted to a monitoring background; when the numerical value of the measured SF6 gas exceeds standards, alarming is conducted in time, and operation and maintenance staff are prompted to find out causes; when humidity testing of the SF6 gas in equipment is qualified, the system can immediately start an inflation pressure pump, an inflation valve is turned on, the GIS equipment is filled with gas in an SF6 gas recycling device, and it is guaranteed that the gas is measured in a flowing state. Devices used in the method include the GIS equipment (1) filled with the SF6 gas, a sulfur hexafluoride gas pressure meter (2), a sulfur hexafluoride gas humidity sensor gas obtaining valve (3), a sulfur hexafluoride gas humidity sensor (4), a sulfur hexafluoride gas humidity online measurement background (5), the sulfur hexafluoride gas recycling device (6), a pressure pump (7) and an adjustable gas supplement valve (8).

Description

technical field [0001] The invention relates to an online and accurate measurement method for sulfur hexafluoride gas humidity in a GIS substation, belonging to the technical field of substation on-line detection. Background technique [0002] Due to the excellent insulation and arc extinguishing properties of SF6 gas, in recent years, GIS substations using SF6 gas as the insulating medium have achieved amazing development, especially in cities with a lot of land, heavily polluted areas and places with harsh operating environments. GIS is given priority in new substations. With the increase of SF6 gas equipment, it is accompanied by the increase of SF6 gas insulation accidents. The high humidity of SF6 gas will seriously affect the insulation strength of high-voltage electrical equipment, and even cause the equipment to be broken down. Therefore, the detection of SF6 gas humidity is very important. important. [0003] At present, in the electric power industry, SF6 gas hum...

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Problems solved by technology

[0003] At present, in the electric power industry, SF6 gas humidity detection is generally carried out in the state of power failure. In recent years, it is also required to manually sample and detect the SF6 gas humidity in GIS substation equipment in the live state. Although some substations are equipped with online monitoring sensors, the measurement The gas in the air is "dead gas" that has not flowed all the time, and the moisture in the air is easy to enter from the joint of the sensor, which will cause the measured humidity data to be too large, and make a wrong judgment on the status of the equipment, which will affect the power grid instead. Normal operation, so many substations leave these devices idle, which does not really play a role in monitoring the status of the equipment, which not only wastes funds, but also increases the leakage points of on-site equipment

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