Transient reactance type power grid short-circuit fault current limiter

Abstract

The invention relates to a transient reactance type power grid short-circuit fault current limiter, and aims at providing the transient reactance type power grid short-circuit fault current limiter which is safe and reliable, relatively low in construction cost and high in capacity with voltage grade of 500KV and above. The technical scheme is that the current limiter is composed of a reactance transformer component, a slide and contact component, a metal sealing cover, an operating mechanism and an insulating platform. The iron core of the reactance transformer component is formed by silicon steel sheets through lamination, and the shape of the iron core is like a Chinese character "hui". The two sides of the iron core are provided with series coils which are formed by bare copper wires through winding. An insulating bushing is arranged between the iron core and the bare copper wires. The exposed part of the bare copper wires is level with the external surface of the insulating bushings. The slide and contact component is composed of a slide conductive ring, a conductive circular barrel body, a spring contact finger, a ceramic arc-extinguishing ring, a conductive slide rod, a separating acceleration spring, a closing position conductive bottom plate and an insulating base plate. The operating mechanism comprises a power part, insulating pull rods and sealing bellows. The transient reactance type power grid short-circuit fault current limiter is suitable for electric power system short-circuit safety protection.

Description

technical field [0001] The invention relates to a current limiter, in particular to a short-circuit fault current limiter of a transient reactance power grid. It is suitable for short-circuit safety protection of power system. Background technique [0002] In recent years, the capacity of the power system has increased year by year, and the short-circuit current of the power grid has also increased, which has become an important factor restricting the operation and development of the power grid. Therefore, limiting the short-circuit current of the power system has become a problem to be solved. [0003] The development of the fault current limiter has opened up the ability to improve the overall control of the operation of AC transmission lines and transmission networks, and pointed out the direction for the innovation and transformation of high-voltage and ultra-high-voltage transmission performance. [0004] The fault current limiter (FCL) appeared in the domestic litera...

AI Technical Summary

Problems solved by technology

[0017] According to the field operation investigation, the existing current limiter technology is difficult to meet the impact level above 500KV and the impact current exceeds 80KA

[0018] In addition, most of the large-capacity 500KV voltage level current limiters cost more than 80 million yuan, which is another important reason why the current limiter device cannot be implemented in the project

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