A mixed gas modification method for a 110kv sulfur hexafluoride gas-insulated current transformer

Abstract

The invention discloses a mixed gas transformation method for a 110 kV sulfur hexafluoride gas insulation current transformer. The mixed gas transformation method comprises the following steps that firstly, an original SF6 gas insulation current transformer body is utilized, gas chamber china bottle bearing pressure and explosion-proof film bearing pressure of the original SF6 gas insulation current transformer body, and the matching relation between the gas chamber china bottle bearing pressure and the explosion-proof film bearing pressure, and mixed gas charging pressure are rechecked; secondly, SF6 gas in the SF6 gas insulation current transformer is recycled; and thirdly, SF6 / N2 mixed gas with the specific ratio and pressure are injected in the SF6 gas insulation current transformer through a mixed gas charging device. The existing SF6 gas insulation current transformer is transformed, not only is the site insulation requirement met, but also the purposes of reduction and replacement of the SF6 gas are achieved, and the mixed gas transformation method is easy to implement and low in cost.

Description

technical field [0001] The invention belongs to the technical field of high-voltage electrical equipment transformation, in particular to a SF 6 SF of gas insulated current transformer 6 / N 2 Mixed gas transformation method. Background technique [0002] SF 6 Due to its excellent insulation and arc extinguishing properties, the gas is the only insulating gas that has been applied in industry so far. It has been widely used in circuit breakers, fully enclosed combined electrical appliances (GIS), power transformers, DC transmission reversing valves and current transformers, etc. in the device. However, SF 6 The gas is a strong greenhouse gas with a global warming coefficient of approximately carbon dioxide (CO 2 ) 23,900 times, once leaked, it will cause long-term and continuous pollution to the environment. 6 The restrictions on the use of gas are becoming more and more stringent, and its replacement and reduction are the general trend. [0003] in SF 6 N 2 , CO 2...

AI Technical Summary

Problems solved by technology

(2) with SF 6 / N 2 Compared with mixed gas GIL and GIS buses, the internal structure of CT is more complicated, and insulation failure is more likely to occur under higher applied voltage

(3) Direct research and development of SF 6 / N 2 Mixed gas insulated current transformer involves many key steps such as insulation structure and mechanical structure design, which requires a lot of cost and a long cycle

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