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Effective Protection Methods of Household Electric Appliances. from Lightning Surges  

이복희 (인하대학 전자·전기공학과)
강성만 (인하대학 차세대고전압전력기술연구센터)
엄주홍 (기초전력공학공동연구소)
이수봉 (인하대학 전기공학과)
길형준 (전기안전연구원)
구본완 (인천인력개발원)
안창환 (한국전력공사)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers C / v.53, no.3, 2004 , pp. 149-156 More about this Journal
Abstract
This paper deals with the effective protection method for the household electric appliances against lightning surges invading from the Power lines. Direct or induced lightning is the main cause of the breakdown of household electric appliance. The most effective protection method is to install SPDs(surge protective devices) at household electric appliances. If SPDs were not installed at most household electric appliances, it is necessary to install SPDs on the mains. Therefore the propagation aspect and protection methods of lighting surges coming into household electric appliances through the mains was experimentally investigated. The in actual-sized test circuits results of protection method for 8 household electric appliances including computer monitors and TV set could be summarized as follows: The breakdown characteristics of household electric appliances from lightning surges were significantly changed with the their input impedance. Namely, the types of input impedance are classified into infinite, resistive or inductive impedances. Especially, the monitor for computer with inductive input impedance from lightning surges was relatively weak against lightning surges. It was confirmed that the self inductance of branch circuits on the mains have protection effect for household electric appliances against lightning surges invading from the power lines. Also the varistors installed at cabinet panel or circuit-breaker were more effective than multi-tap outlet with varistors. When installed varistors in cabinet panel and multi-tap outlet together, the surge protection effect is much more excellent in technical and economical aspects.
Keywords
Surge protective device; Lightning surges; Household electric appliance; Coordination characteristics; Effective protection methods;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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