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http://dx.doi.org/10.5762/KAIS.2021.22.2.487

Characteristics of loci on Line-to-Earth Voltage according to Earth Fault in Earthing System for Ships  

Kim, Jong-Phil (Ship Operation Team, Korea Institute of Maritime and Fisheries Technology)
Ryu, Ki-Tak (Offshore Training Team, Korea Institute of Maritime and Fisheries Technology)
Lee, Yun-Hyung (Education Management Team, Korea Institute of Maritime and Fisheries Technology)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.22, no.2, 2021 , pp. 487-495 More about this Journal
Abstract
The voltages mainly used in ships are 450 [V], 6.6 [kV], and 11 [kV], and an earthed system is applied to ensure the stability of the power distribution system. In general, low-voltage ships using 450 [V] apply an unearthed system, while high-voltage ships using 6.6 [kV] or 11 [kV] use a high-resistance earthed system. When an earth fault occurs in a ship's power distribution system, the voltage of the healthy phase increases to the line-to-line voltage or higher, which causes an excessive impact on the insulation of the cable. Thus, analyzing this behavior is very important. In this paper, we investigate the characteristics of the line-to-earth voltage variation according to earth faults and a recognition procedure of a faulty phase using the symmetrical coordinate method for a high-resistance earthed system and unearthed system. A mathematical model of the line-to-earth voltage was derived through the symmetric coordinate method, and the ship voltage for simulations was selected as 6.6 [kV] and 450 [V]. A MATLAB simulation proved that this method can determine the highest increase of the line-to-earth voltage, which leads by 120° on the faulty phase, and it accurately judges the faulty phase in both earthed systems.
Keywords
Academia-Industrial; Earth fault; Line-to-earth voltage; Resistance earthed system; Symmetrical coordinates method; Unearthed system;
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  • Reference
1 IEC 60092-509, "Electrical installation in ships - part 509: Operation of electrical installations", 2011.
2 IEEE Recommended Practice for Grounding of Industrial and Commercial Power Systems, IEEE std. 142-2007.
3 D. Paul and S. I. Venugopalan, "Low-resistance grounding method for Medium-Voltage power systems", in Conf. Rec. IEEE IAS Annu. Meeting, pp. 1571-157, 1991. DOI: https://doi.org/10.1109/IAS.1991.178070   DOI
4 L. J. Kingrey, R. D. Painter, and A. S. Locker, "Applying high resistance neutral grounding in medium voltage systems," IEEE Transactions on Industry Application, vol. 47, no. 3, pp. 1220-1231, 2011. DOI: https://doi.org/10.1109/TIA.2011.2126553   DOI
5 J. R. Dunki-Jacobs, F. J. Shields, and C. St. Pierre, Industrial Power System Grounding Design Handbook. Dexter, MI: Thomson-Shore, 2007.
6 B. Bridger, "High resistance grounding," IEEE Transactions on Industry Applications, vol. IA-19, no. 1, pp. 15-21, Jan./Feb. 1983. DOI: https://doi.org/10.1109/TIA.1983.4504149   DOI
7 NEMA WC5-1992/ICEA S-61-402, Thermal Plastic Insulated Wire and Cable for the Transmission and Distribution of Electrical Energy.
8 System Grounding for Low-voltage Power Systems, Catalog GET-3548(11-1975), Industrial Power System Engineering Operations, General Electric Company, Schenectady, NY 12345.
9 D. D. Shipp, and F. J. Angelini, "Characteristics of different power systems grounding techniques: fact & fiction," IEEE Trans. Ind. Appl. Ann. Mtg. Conf. Rec., 1988. DOI: https://doi.org/10.1109/IAS.1988.25261   DOI
10 2008 National Electrical Code Handbook, 11th ed., Nat. Fire Protection Assoc., Quincy, MA, 2008.
11 B. Bridger, "What to know about high resistance grounding," EC&M, pp. 37-46, Jul. 1994.
12 S.H. Yoo and 8 others, Practical application technology of protective relay system, Gidali, 2006.
13 KR, Part 6 Electrical Equipment and Control Systems, KR-Rules & Guidance, 2020.