Gas mixture filling device of high-voltage electrical equipment in extremely cold area

Abstract

The invention discloses a gas mixture filling device of high-voltage electrical equipment in an extremely cold area. The gas mixture filling device comprises a gas-filling device temperature-regulating box and a gas filling device body arranged in the gas-filling device temperature-regulating box; the gas-filling device temperature-regulating box is provided with a temperature regulating device; the gas filling device body comprises an SF6 gas filling pipeline, a CF4 or N2 gas filling pipeline, a mixed gas cylinder and a ratio flow control device; an output opening of the SF6 gas filling pipeline and an output opening of the CF4 or N2 gas filling pipeline communicate with an input opening of the mixed gas cylinder; the SF6 gas filling pipeline sequentially comprises an SF6 gas tank interface, a high pressure reducing valve, a first proportional solenoid valve, a first manually-operated valve and a first mass flow controlling instrument from an input opening to the output opening; the CF4 or N2 gas filling pipeline sequentially comprises a CF4 or N2 gas source tube interface, a second proportional solenoid valve, a second manually-operated valve and a second mass flow controlling instrument from an input opening to the output opening; and the mixed gas cylinder is provided with an output pipeline for being connected with the high-voltage electrical equipment. The gas mixture filling device of the high-voltage electrical equipment in the extremely cold area has the characteristics of being constant in gas supplying pressure, safe, reliable, resistant to low temperature and the like.

Description

technical field [0001] The invention relates to a mixed gas replenishing device for high-voltage electrical equipment in extremely cold regions. Background technique [0002] SF6 gas has excellent insulation and arc extinguishing properties, and is the main insulation medium for high-voltage electrical equipment. In my country's alpine regions such as Inner Mongolia, Xinjiang, Qinghai, and Heilongjiang, the temperature in winter is very low, sometimes even lower than -40°C. In order to increase the inflation pressure of electrical equipment and at the same time ensure that the gas does not liquefy under low temperature conditions, sulfur hexafluoride mixed gas (SF6 / CF4 or SF6 / N2) is gradually used as the insulating medium instead of pure sulfur hexafluoride gas. At the same time, it plays the role of environmental protection, energy saving and emission reduction. [0003] Within a certain gas pressure range, the insulation and arc extinguishing performance of the gas has a...

AI Technical Summary

Problems solved by technology

For high-voltage electrical equipment with mixed gas (SF6 / CF4 or SF6 / N2) as the insulating medium, gas replenishment in winter is an extremely difficult task. On the one hand, the temperature in winter is very low, and liquid sulfur hexafluoride gas is difficult to vaporize On the other hand, the devices, pipelines and instruments used for inflation cannot work normally at low temperatures, and there are often failures such as gas pipelines freezing and cracking, instruments not working, and valves not opening or jamming; The indication value of the pressure gauge installed on the equipment is based on the measurement basis to supplement the gas or only use SF6 gas to supplement the gas pressure in the equipment to the rated value, so that the volume ratio of the mixed gas in the equipment deviates from the rated value, which greatly affects the operation of the equipment Safety

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