A solid state current limiter applied to coal mine power system

Abstract

In view of problems of high power consumption, voltage drop and big interference caused by downhole cable of surface substation using current-limiting reactance to limit short-circuit capacity, a solid state current limiter applied to coal mine power system was designed. The limiter is composed of solid circuit breaker and original current-limiting reactance. When power system works normally, the solid state current limiter bypasses the current-limiting reactance to avoid influences of the current-limiting reactance on power system. When power system has short-circuit fault, the solid state current limiter is broken from circuit, meanwhile the current-limiting reactance is inserted into the circuit to limit short-circuit current. Matlab simulation result validates feasibility of the solid state current limiter.

Keywords

• coal mine power system
• solid state current limiter
• current-limiting reactance
• solid circuit breaker
• short-circuit current
• protection circuit