Transient reactive grid short-circuit fault current limiter

Abstract

The invention relates to a transient reactance type electric network short-circuit fault current limiter. The purpose of the present invention is to provide a safe, reliable, and relatively low-cost transient reactance short-circuit fault current limiter with a large capacity of 500KV and above. The technical solution of the present invention is: the current limiter is composed of a reactance transformer assembly, a sliding and contact assembly, a metal enclosure, an operating mechanism and an insulating platform. It is a series-connected coil made of bare copper wires. There is an insulating sleeve between the iron core and the bare copper wire. The exposed part of the bare copper wire is flush with the outer surface of the insulating sleeve; the sliding and contact components are electrically conductive by sliding Ring, conductive cylinder body, spring contact finger, ceramic arc extinguishing ring, conductive sliding rod, opening acceleration spring, conductive bottom plate and insulating backing plate at the closing position; the operating mechanism includes a power part, an insulating pull rod and a sealed bellows. The invention is suitable for the short-circuit safety protection of the power system.

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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