Throughout the text, three kinds of neutral point grounding

forms have their own advantages and disadvantages[1], [2], [10].

Starting from the actual, combined with the specific conditions
of distribution network, then, through comparing and
analyzing we will determine which method of grounding
should be chosen ultimately.

REFERNCES
[1] Y. Chen, “Power system steady-state analysis (Third edition),”Beijing:
China electric power press, 2007. (in Chinese)
[2] G. Q. Li, “Power system transient analysis (Third edition),” Beijing:
China electric power press, 2007. (in Chinese)
Fig. 14 Neutral point three-phase current waveform when single-phase [3] B. H. Zhang, X. G. Yin, “Power System Protective Relaying (Second
grounding fault (Abscissa t/s ; Ordinate I/A ) edition),”Beijing: China electric power press, 2010. (in Chinese)
[4] J. Wang, G. Q. Weng, Y. B. Zhang, “MATLAB/SIMULINK electric
Fig. 15 Fault point three-phase voltage waveform when single-phase
power system simulation and application,” Xian: Xidian University
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[5] J. Ye, C. Q. Li, “Urban medium-voltage power network neutral point
From Figure 6 to Figure 15 can be seen that through the grounding mode of exploration,” Shanghai Electric, vol. 1, pp. 54-57
fault phase current is maximum when neutral grounding via 2006. (in Chinese)
low resistance mode if single-phase grounding fault occurs, [6] Y. L, C. H. Wang, “Analysis and discussion of low-voltage power
and through the grounding point currents are also maximum. network neutral-point earthing way in China,” Shaanxi electric power,
vol. 5, pp. 10-15, Jan. 2008. (in Chinese)
The method of neutral point using the arc suppression coil [7] M. Y. Liu, “Selection of neutral grounding in distribution network,”
grounding will form the size of grounding point current Grid technologies, vol. 28, pp. 86-89, 2004. (in Chinese)
approaching equal but in opposite directions inductor current, [8] Y. F. Li, “Neutral grounding in distribution network,” Electric power
which can compensate the grounding capacitive current in system protection and control, vol. 36, pp. 58-60, 2008. (in Chinese)
[9] Z. F. He, P. Liu, “Studies of middle-pressure power network neutral
power network, and it make the current through the fault phase point grounding mode,” Electric power automation equipment, vol. 22,
is minimum, flowing through the grounding point current is Sep. 2002. (in Chinese)
minimum, then eliminating grounding arc and its hazards. [10] D. D. He, G. H. Zhang, R. T. Yang, “Simulation research on neutral
grounding in distribution network,” Electro-technology, Aug. 2011.
(in Chinese)
III. CONCLUSIONS [11] A.N. Guven, S.A. Sebo, “Analysis of ground fault current distribution
For the medium voltage distribution network, especially the along underground cables,” IEEE Transactions on Power Delivery, vol.
4, pp. 9-18, Feb. 1986.
cable distribution networks, we should consider using neutral [12] E.L. Owen, “The historical development of neutral grounding
point arc suppression coil grounding when the capacitor practices,” IEEE Industry Applications Magazine, vol. 2, pp. 10-20,
current is 10A~150A. We should consider using Mar. 1997.
low-resistance neutral point grounding when the system [13] L. Sun, X. Zhou, L. D. Chen, “Honest Neutral Grounding Distribution
Network Analysis,” Northeast Electric Power Technology, vol. 25, pp.
capacitive current is 100A~1000A. But no matter which 44-48, Jun. 2005. (in Chinese)
grounding method be chosen, we should focus on limited [14] J. Wu, “Urban Distribution Network Neutral Grounding Resistor
earthing fault current when occurred single-phase earthing, as Features and Application,” Electric Safety Technology, vol. 10, pp.
far as possible to reduce its harmfulness, as in [7]. The neutral 23-25, Feb. 2008. (in Chinese)
[15] Ran Zhao, Weipu Tan, Yihan Yang, “Distribution Network Neutral
point grounding mode of flowchart is shown in Figure.16. Grounding Mode Analysis,” Relay, vol. 35, pp. 22-26, Apr. 2007. (in
Chinese)

Fig. 16 The neutral point grounding mode of flowchart

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