Open AccessA Study on Lightning Overvoltage Characteristics of Grounding Systems in Underground Distribution Power Cables
Author(s) -
Chae-Kyun Jung,
Yeonha Jung,
Ji-Won Kang
Publication year - 2014
Publication title -
journal of electrical engineering and technology/journal of electrical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.226
H-Index - 27
eISSN - 2093-7423
pISSN - 1975-0102
DOI - 10.5370/jeet.2014.9.2.628
Subject(s) - ground , overvoltage , emtp , earthing system , engineering , transient (computer programming) , lightning (connector) , lightning strike , electric power system , electrical engineering , power cable , power (physics) , voltage , computer science , physics , chemistry , organic chemistry , layer (electronics) , quantum mechanics , operating system
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.