Positive temperature coefficient resistance material-based hybrid current limiter

Abstract

The invention provides a positive temperature coefficient resistance material-based hybrid current limiter. The positive temperature coefficient resistance material-based hybrid current limiter comprises a steady-state current through branch, a current limitation path and a lightning arrester path which are connected in parallel, wherein the steady-state current through branch comprises an ultrahigh-speed mechanical switch and a semiconductor assembly capable of being switched off, which are connected in series, the steady-state current through branch is used for bypassing the current limitation path so as to transmit a load current when a power system normally runs, the current limitation path comprises a positive temperature coefficient (PTC) resistor and a semiconductor assembly which are connected in series, and the current limitation branch is used for suppressing a fault current when a fault occurs in the power system. Compared with the prior art, the PTC resistance material-based hybrid current limiter provided by the invention has the advantages that a limitation threshold of the fault current can be flexibly set, arc-free disconnection of the ultrahigh-speed mechanical switch also can be achieved, and the PTC resistance material-based hybrid current limiter is simple to operate and is reliable and practical.

Description

technical field [0001] The invention relates to the technical fields of AC and DC power transmission and power electronics, in particular to a hybrid current limiter based on a positive temperature coefficient resistive material. Background technique [0002] The fault current generated after the power system failure will cause a huge current impact on the normal operation of the power equipment, which makes the power equipment bear greater thermal stress and electromotive force, and generates higher overvoltage on the inductive equipment of the power system. At the same time, the fault current will put forward extremely high technical requirements for the development of current breaking equipment, such as DC circuit breakers and other current breaking equipment. [0003] At present, a current limiter is generally installed in the power system to reduce the fault current. The traditional fault current limiter is mainly a superconducting current limiter, but since the superc...

AI Technical Summary

Problems solved by technology

During the operation of this kind of current limiter, because the ultra-fast mechanical switch needs to pull the arc when it is broken, it has extremely high requirements for the equipment development and opening speed of the ultra-fast mechanical switch. voltage can not be suppressed

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