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http://dx.doi.org/10.5370/KIEE.2012.62.1.143

Operational Characteristics of the High-speed Interrupter for Reliability Enhancement of Power Supply and Demand  

Choi, Hye-Won (Dept. of Electrical Engineering, Chosun University)
Choi, Hyo-Sang (Chosun University)
Jung, Byung-Ik (Dept. of Electrical Engineering, Chosun University)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.62, no.1, 2013 , pp. 143-148 More about this Journal
Abstract
When the fault occurs in power system, the fault-current exceeds breaking capacity of the circuit breaker. So, reliablity of the power system is decreased sharply. Superconducting fault-current limiter (SFCL) is operated without impedance in normal state. The fault-current is limited by its impedance during the fault condition. However, the SFCL has several weak points such as huge size, high-price, liquid-nitrogen operation for the real power system. In this paper, We suggested the high-speed interrupter to limit the fault-current in case of the single line-to-ground fault. In addition, we compared the high-speed interrupter with the SFCL to ensure the operation reliability. The proposed interrupter detected the fault-current through the CT, and the power was supplied by operation of the SCR control system. In this experiment, the power of high-speed interrupter was applied after the 4.8[msec] from fault instant. The on-off operation of the interrupter was started after half-cycle from the fault. The fault-current was flowed into the impedance element by the switching operation of the high-speed interrupter. So, the fault current was limited within one cycle, and then it didnt exceed the capacity of a circuit breaker. We confirmed that there was slight difference between the SFCL with high-speed interrupter in terms of limiting-time of the fault-current and switching speed of the SCR. The high-speed interrupter was considered to be more efficient than the SFCL in size, cost or reliability.
Keywords
High-speed interrupter; SFCL; SCR control system; Sol valve;
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  • Reference
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