Micro water density measuring device

Abstract

The invention relates to a micro water density measuring device which is simple in structure, safe, environment-friendly and suitable for inflating tested gases back to SF6 electrical equipment. The micro water density measuring device comprises a joint used for being connected with an exhaust port of tested equipment, and a gas exchange chamber communicated with the joint, wherein the gas exchange chamber is suitable for inflating the gas from the tested equipment back to the tested equipment. The operating method of the device comprises the following steps of: storing a whole body consisting of the joint and the gas exchange chamber in drying equipment or by using drying agents when the device is not used; or when the device is used, connecting the joint with the exhaust port of the tested equipment, opening the exhaust port, feeding the gas of the tested equipment to the gas exchange chamber, inflating the gas back to the tested equipment after the measurement is finished, closing the exhaust port and detaching the joint.

Description

technical field [0001] The invention relates to a device for measuring micro-water density, especially a device for measuring SF in SF6 electrical equipment. 6 A device for measuring the density of moisture contained in a gas. Background technique [0002] SF 6 (Sulfur hexafluoride) gas is widely used in high-voltage, large-capacity, high-parameter electrical equipment because of its good insulation performance and stable chemical structure. The normal operating high-voltage switchgear, its SF 6 The moisture contained in the gas is less than 300PPMV. If the moisture content exceeds the standard, it will cause the insulation performance of the switch to decrease, causing high voltage breakdown. Due to the decline in insulation performance, partial discharge will occur near both ends of the switch. Penetrating flashover directly affects the breaking performance of the high-voltage switch, and at the same time, the SF 6 The compounds produced after the gas is decomposed by ...

AI Technical Summary

Problems solved by technology

[0002] SF 6 (Sulfur hexafluoride) gas is widely used in high-voltage, large-capacity, high-parameter electrical equipment because of its good insulation performance and stable chemical structure. The normal operating high-voltage switchgear, its SF 6 The moisture contained in the gas is less than 300PPMV. If the moisture content exceeds the standard, it will cause the insulation performance of the switch to decrease, causing high voltage breakdown. Due to the decline in insulation performance, partial discharge will occur near both ends of the switch. Penetrating flashover directly affects the breaking performance of the high-voltage switch, and at the same time, the SF 6 The compounds produced after the gas is decomposed by the arc will corrode metal objects and insulating parts, thereby shortening the service life of the high-voltage switch

[0003] Therefore, during the use of the high-voltage switch, the moisture content in the gas must be detected regularly or irregularly. The current measurement method exhaust method is to connect the detection equipment to the gas filling nozzle of the high-voltage switch, and then release SF 6 Gas, because the moisture in the outside world is dozens of times higher than the moisture content of the gas in the switch, it needs to be released for several minutes to reach the test balance, and the gas released after the test cannot be filled back into the protective gas chamber of the high-voltage switch. First of all, it will affect the protection. The rated pressure requirements of the gas chamber lead to the need for frequent gas replenishment; secondly, it causes a serious waste of the high-priced switch protection gas; thirdly, the discharged SF 6 It will cause harm to the on-site staff and cause serious pollution to the atmosphere

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