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A Study on Lightning Overvoltage Characteristics of Grounding Systems in Underground Distribution Power Cables
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 Title & Authors
A Study on Lightning Overvoltage Characteristics of Grounding Systems in Underground Distribution Power Cables
Jung, Chae-Kyun; Jung, Yeon-Ha; Kang, Ji-Won;
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 Abstract
This paper investigates the transient characteristics of grounding systems used in under-ground distribution power cables. Recently, two kinds of grounding system are used for underground distribution cables in Korea. The first one is conventional multi-point grounding system, the other is newly proposed non-bundled common grounding system. The non-bundled common grounding system has an advantage the decreasing the power loss due to decrease of the shield circulation current. In this paper, the lightning overvoltage induced in neutral wire (in case of non-bundled common grounding system, overvoltage between opened neural wires and grounding in each phase) of these two kinds of grounding systems are estimated and compared by field tests and EMTP simulations. The EMTP simulation methods are firstly verified by comparison of measurement and simulation. Finally, the insulation level against lightning is expected by EMTP simulation results using verified model.
 Keywords
Distribution cable system;Lightning overvoltage;Multi-point grounding system;Non-bundled common grounding system;
 Language
English
 Cited by
 References
1.
C. K. Jung, et al., "Analysis of Surge Characteristics according to Grounding Methods on Underground Distribution Cables", KIEE Summer Annual Conference Proceedings, July, 2012.

2.
W. S. Choi, et al., "Influence of Surge in Non-bundled Common Earth Method", KIEE Summer Annual Conference Proceedings, July, 2012.

3.
ES-6145-0019, "22.9kV Concentric Neutral Type Crosslinked Polyethylene Insulated Vinyl Sheathed Power Cables", KEPCO Standard, April, 2009.

4.
IEC 60287, "Electric cable - Calculation of the current rating", IEC Std. February, 2001

5.
IEEE Std. 575, "IEEE Guide for Application of Sheath-Bonding Methods for Single-Conductor Cables the Calculation of Induced Voltage and Current in Cable Sheaths", IEEE Standard Board, 1998

6.
KEPCO, "Final Report - A Study on the Establishment of Insulation Coordination Scheme in Distribution Systems", KEPCO, May, 2003.