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A Study on the Transient Characteristic and Protection Schemes of Sheath Circulating Current Reduction Equipment  

강지원 (한전 전력연구원)
한용희 (한국전력공사)
정채균 (원광대 전기전자 및 정보공학부)
이종범 (원광대 전기전자 및 정보공학부)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers A / v.52, no.7, 2003 , pp. 421-428 More about this Journal
Abstract
After the cable is installed, many geometric factors, such as bowing types of the cable and the length difference of the cable between each minor section will cause the impedance unbalance between cables. The impedance unbalance will increase or decrease the sheath circulating currents, which are critical to human safety and sustaining the capabilities of electric power. Accordingly, in this paper, a new method is also proposed to reduce the sheath circulating currents and an reduction equipment according to the theory of the new method is developed. The reduction equipment is tested when the cable is on service. The test results show that it can reduce the sheath circulating currents by up to 97.8［%］. This confirms the validation of the new method and the reduction equipment, and assures the safe operation of the transmission cables. In order to illustrate the safe operation of the cable with new current reduction equipment at transient state due to lightning and single line-to-ground fault, extensive simulations have been made. Then the protection scheme of sheath circulating currents reduction equipment is proposed by adopting the new device of RDP(Reduction Device Protector).
Keywords
Sheath circulating current; Transmission cable; RDP;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
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