The water content of sulfur hexafluoride gas or regeneration gas shall be strictly controlled and shall not exceed the national standard. During operation, the water content of high-purity sulfur hexafluoride can be higher, but it cannot exceed the national standard value for six gas operation. When replenishing gas, re measure the micro water content of the gas cylinders stored for more than half a year before use. The water content of high-purity sulfur hexafluoride gas in the national standard shall not be higher than 8ppmw.

Improve the environmental conditions of sulfur hexafluoride gas high-voltage electrical equipment in the process of assembly, maintenance and inspection, monitor the air humidity of the environment, and the air humidity at the work site shall not be greater than 80%. The installation and maintenance personnel must follow the requirements of relevant processes to assemble and maintain them on the site to maintain the cleanliness of the insulating parts and components in the equipment, because when some dirt exists on the surface of the insulating parts, The surface insulation resistance of insulating parts will be reduced to several orders of magnitude, which will result in a great drop in the surface discharge voltage of insulating parts.

The test and theoretical analysis have proved that when the dirt that can reduce the insulation resistance does not exist on the surface of the insulator, the condensate itself will not significantly reduce its surface insulation capacity. In other words, it is necessary to keep the surface of insulating parts clean during assembly and maintenance. Before assembly, the surface can be cleaned with acetone, and the surface of insulating parts shall also be kept clean during use. The sulfur hexafluoride gas pipeline shall be well preserved. Before gas filling, the pipeline shall be thoroughly flushed to prevent moisture from entering the equipment.

Moisture has a great impact on high-purity sulfur hexafluoride gas and equipment. the amount of moisture content in sf6 gas is directly related to the level of gas insulation strength and the safe operation of equipment. In the equipment, the micro water content in the gas shall be strictly controlled. Only by controlling the micro water content in SF6 gas within the range specified in the national standard can the influence of water on SF6 gas and equipment be reduced to * * * low, and the stability of gas insulation strength and the safe operation of equipment can be guaranteed.

The content of the article comes from sulfur hexafluoride gas: http://www.feiliergas.com