Low temperature mixed insulating gas supplementing device

Abstract

The invention provides a low temperature mixed insulating gas supplementing device which comprises an SF6 gas cylinder, a first gas cylinder, a liquid storage tank and sulfur hexafluoride electric equipment. The low temperature mixed insulating gas supplementing device is characterized in that an SF6 gas supplementing path, another gas supplementing path, a gas mixer, a buffer tank, a vacuum pump, a compressor, an electromagnetic flow valve and an electromagnetic valve are additionally arranged, wherein a spiral tube with a partitioning baffle is used as the gas mixer and is provided with two output ends; one output end of the gas mixer is communicated with the atmosphere through a first control valve; the other output end of the gas mixer is communicated with the sulfur hexafluoride electric equipment through a second control valve, the buffer tank, the electromagnetic flow valve and a third control valve in sequence; the output end of the electromagnetic flow valve is further connected with the liquid storage tank through a fourth control valve and is connected with the liquid storage tank through the compressor and the electromagnetic valve, respectively; the input end of the gas mixer is communicated with the SF6 gas cylinder through the SF6 gas supplementing path and is connected with the first gas cylinder through another gas supplementing path, respectively; the gas outlet ends of the SF6 gas cylinder and the first gas cylinder and the gas inlet end of the gas mixer are all connected with the atmosphere through the vacuum pump. By adopting the low temperature mixed insulating gas supplementing device, two types of gas are rapidly pressurized, divided and mixed, and the gas mixing ratio is precise and reliable.

Description

technical field [0001] The invention provides a low-temperature replenishment device for mixed insulating gas, which belongs to the technical field of gas replenishment for electrical equipment. Background technique [0002] In my country's Xinjiang, Inner Mongolia and Northeast China, the outdoor temperature in winter can reach -40°C, and some areas even reach -50°C. Under such low temperature conditions, SF6 electrical equipment is often caused by SF 6 The liquefaction of the gas causes the pressure to drop, and when it drops to the blocking pressure value, SF 6 Electrical equipment cannot operate, and even cause large-scale power outages in severe cases. In order to solve the problem of SF in electrical equipment of sulfur hexafluoride in cold northern regions 6 For the problem of gas liquefaction at low temperature, SF is generally considered 6 Mixed insulating gas instead of pure SF 6 gas. During the operation or maintenance of mixed insulating gas electrical equip...

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Problems solved by technology

At present, only for SF at home and abroad 6 The research on gas backfilling technology, there is no research on mixed insulating gas replenishment or backfilling technology; the current inflating of mixed insulating gas is mostly through multiple inflations, and the filling ratio is judged according to the partial pressure. Not only is the operation cumbersome, but the mixing ratio The error is large, and it is difficult to realize the supplement of a specific ratio of mixed gas, which may affect the normal operation of the equipment

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