SF6 gas filling device

Abstract

The invention provides an SF6 gas filling device which comprises a base, trundles and a gas filling bottle. The gas filling bottle comprises an inner bottle body and an outer bottle body, a first heating wire is arranged between the inner bottle body and the outer bottle body, a heat transfer medium is filled between the inner bottle body and the outer bottle body, and the inner bottle body is provided with a gas valve, a resistance teletransmission pressure gauge and a gas conveying pipe connected with the gas valve; and a first thermistor, a heating sleeve and a second thermistor are sequentially installed on the gas conveying pipe, a second heating wire is arranged in the heating sleeve, the first thermistor, the resistance teletransmission pressure gauge and the first heating wire are connected into a circuit in series, and the second thermistor and the second heating wire are connected into a circuit in series. The bottle bodies can be rapidly and effectively heated, so that the bottle bodies are uniformly heated, the heat absorption effect of the bottle bodies is improved, rapid inflation is realized, the gas filling efficiency is improved, and the temperature of gas flowing out of the gas conveying pipe can be maintained in a fixed range.

Description

technical field [0001] The invention relates to the technical field of inflators, in particular to an SF6 gas inflator. Background technique [0002] In recent years, with the rapid development of my country's electric power industry and the improvement of technical equipment, a large number of SF6 electrical equipment has been put into operation. SF6 (sulfur hexafluoride) gas is widely used in power systems due to its excellent insulation and arc extinguishing properties. It has almost become the only insulation and arc-extinguishing medium used in medium-voltage, high-voltage and ultra-high-voltage switches. Due to the large number of SF6 equipment and long-term operation, there is often the possibility of air leakage, which requires regular air replenishment. However, when replenishing gas, the SF6 stored in the steel cylinder is in a liquid state inside the cylinder. When it is inflated, the volume of SF6 expands rapidly when the liquid state is transformed into a gas, an...

AI Technical Summary

Problems solved by technology

However, when replenishing gas, the SF6 stored in the steel cylinder is in a liquid state inside the cylinder. When it is inflated, the volume of SF6 expands rapidly when the liquid state is transformed into a gas, and accompanied by a large amount of heat absorption, the surrounding water vapor condenses into frost and adheres to the bottle. Body and pressure reducing valve and other parts, the temperature inside the steel cylinder also drops sharply, the output pressure of the steel cylinder is getting lower and lower, and the pressure in the equipment increases with the increase of the filling amount, so that the gas filling speed of the steel cylinder is slow, and the pressure balance is quickly reached. When the inflation stops, the gas in the equipment often does not reach the rated pressure value. At this time, there is still a large amount of sulfur hexafluoride in the steel cylinder, which cannot be charged any more, and the inflation efficiency is reduced.

[0003] In addition, due to condensation on steel cylinders and pipelines, the temperature in the steel cylinders drops, and even the form solidifies. Due to its large flow velocity and pressure, sulfur hexafluoride after decompression often enters in the form of both liquid and gaseous states. Equipment, during the inflation process, we can only judge the inflation volume based on the pressure gauge data with temperature detection, and cannot accurately estimate the actual value of sulfur hexafluoride, and the deviation is large

After the gas enters the equipment and stabilizes for a long time, the liquid sulfur hexafluoride is completely vaporized, and the gas pressure in the equipment increases, even exceeding its safe pressure, which will have a non-negligible impact and damage on the density relay on the equipment and the equipment.

[0004] The publication number is: CN104390132A, and the name is: multi-functional SF6 steel cylinder inflation device, which proposes a technical scheme, which is set through a heating unit, and a gas pipeline is installed inside the heating unit, so as to discharge the air from the cylinder. The outflowing SF6 gas is heated, and the steel cylinder is heated. However, by reading the contents of the manual and combining the drawings of the manual, it can be seen that the focus is on heating the SF6 gas flowing out of the steel cylinder, and it is obviously not enough to heat the steel cylinder body. In addition, the heating of the steel cylinder body is not uniform, the work efficiency is low, and the steel cylinder cannot be heated quickly and effectively, so that the air pressure in the steel cylinder does not increase obviously and quickly, and there is a serious waste of heat. The temperature unit is to control the gas pressure in the steel cylinder to reach the rated value, but it does not control the temperature of the gas inside the gas pipeline, which can easily cause the temperature of the outflowing gas to be too high and cannot be maintained in a fixed temperature range. Even if the pressure of the gas rushing into the SF6 electrical equipment reaches the rated pressure, once the temperature drops, the gas pressure in the SF6 electrical equipment will decrease again, and multiple inflation operations are required to ensure that the pressure in the SF6 electrical equipment reaches the standard at room temperature pressure, greatly prolonging the working time

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