Definition of a New Graphic Pattern for Single Phase to Ground Fault in the Power Plant and Effects of the Neutral Grounding Impedance on It

Document Type : Research Paper

Author

Electrical and Computer Engineering Faculty, Semnan University, Semnan, Iran.

Abstract

The grounding system of the step-up transformers is one of the main issues in power plants especially in large industries such as petrochemicals and refineries. In addition to the effects of this system on the fault currents and voltages magnitude, the dynamic behavior of the generators is also affected at fault duration by the neutral grounding impedance. In this paper, at first analytical expressions of some parameters such as current, active power, and power angle of the generator are derived for a phase to ground fault. Then the validation of derived equations is examined by simulation of a real power plant located in a petrochemical complex. At last, these equations will be used to define a new graphic pattern of fault which is the locus of the active power vs short circuit current. The shape of this pattern is related to the type of the fault and grounding impedance. Hence it can be used to identify some faults in the power systems

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Main Subjects


[1] Mitolo, M., “Grounding the Neutral of Electrical System
through Low Resistance Grounding Resistor; an application
case,” 1st Annual Meeting, Industry Application Conference,
2005, Vol.2, pp.1479-1502
[2] Izadfar, Farsad, Andvari, Shokri, “Design and Calculation
66KV Neutral Grounding Resistor for Main Transformers in
Bandar Imam Petrochemical Complex(BIPC) Power Station
Located in South West of Iran,” 8th Conference on Electrical
Machines and Systems(ICEMS)2005, Vol.3, pp. 2343-2353
[3] Izadfar H.R., Shokri S., Sheibani, “Step up Transformer
Neutral Grounding Resistor Effects on an Industrial Network
Transient Stability,” 8th Conference on Electrical Machines
and Systems (ICEMS) 2005, Vol.3, pp. 1717-1720
[4] Kingery, L.J., Locker, A.S., “Applying High Resistance
Neutral Grounding in Medium Voltage Systems,” Petroleum
and Chemical Industry Conference (PCIC), September 2010,
pp. 1-11
[5] Kingery, L.J., Locker, A.S., “Applying High Resistance
Neutral Grounding in Medium Voltage Systems,” IEEE
Transaction On Industry Applications, Vol.47, Issue 3, pp.
1220-1231
[6] Wei Shi, Fan Li, Yanhua Han, Yung Li., “The Effect of
Ground resistance on Secondary Arc Current on an EHV
Transmission Line,” IEEE Transactions on Power Delivery,
vol. 20, NO.2, April 2005. 1502-1506
[7] Dewey H.H., “General Considerations in Grounding the
Neutral of Power Systems,” Journal of American Institute of
Electrical Engineers, Vol. 42, Issue 6, June 1923, 589-600
[8] Quingquan Jia, Ning Wang, “A Thyristor Controlled Neutral
Grounding Reactor for Medium Voltage Power Networks,”
Transmission and Distribution Conference Exhibition Asia
and Pacific, 2005 IEEE/PES, 1-4
[9] Shyh-Jier Haung, Hsing-Ho Wan, “A Method to Enhance
Ground- Fault Computation,” IEEE Transactions on Power
Systems Vol.25, NO.2, May 2010, 1190-1191
[10] Li Jinjei, Qi Yulin Qiaomei, Sun Shihao, “Single Phase to
Ground Fault Location Based on Phase of zero- sequence
Current,” International Conference on Information and
Automation, Yin Chuan, China, August 2013, pp. 856-859
[11] P. Velmurugan, A.D. Chattopadhayay, N. Prabaharan,
“Sensitivity analysis of a single phase to ground fault system
in connection with high impedance faults: A case study”,
Cogent Engineering, Vol. 7, Issue 1, 2020,
doi.org/10.1080/23311916.2020.1770916
[12] S. Suhono, H. Purnama, H. Budi Utomo, M. Prayoga,
“Simulator for Overcurrent Phase and Ground Fault
Protection with Microprocessor Based Relays”, Advances in
Engineering Research, vol. 198, 2020, pp. 117-124
[13] Ying Zhong, Xiaoning Kang, Zaibin Jiao, Zengchao Wang,
Jail Suonan, “A Novel Distance Protection Algorithm for the
Phase Ground Fault,” IEEE Transactions on Power Delivery,
vol. 29, NO.4, August 2014, pp. 1718-1725
[14] Jia Qingquan, Yang Qixun, Yang Wei, Yang Yihan, Song
Jiahua, “Multi-Criteria relaying Strategy for Single Phase to
Ground Fault in MV Power System,” International
Conference on Power System Technology, Vol.2,2002,
pp.683-687
[15] Riffat, R., “Consideration and Improvements of
Configuration and Protection of a 72KV Mining Resistance
Neutral Grounded System,” Industrial and Commercial
Power Systems Technical Conference (ICPS 2008), 1-5
[16] Kingery, L.J., Locker, A.S., “Applying High Resistance
Neutral Grounding in Medium Voltage Systems,” Petroleum
and Chemical Industry Conference (PCIC), September 2010,
pp.1-11
[17] George S. Koeppl, Dieter Bruan, Martin Lanker., “Double earth
Faults in Power Stations,” IEEE Transactions on Power
Delivery, vol. 10, NO.2, April 1995, pp. 1002-1009
[18] Behnam Mahamdi, Jian Guo Zhu., “Unsynchronized Fault
Location Based on the Negative Sequence Voltage Magnitude
for Double Circuit Transmission Lines,” IEEE Transactions on
Power Delivery, vol. 29, NO.4, August 2014, pp. 1901-1908
[19] 17.Monia Ben Khader, Gerand Champenios., “New Expressions
of Symmetrical Components of the Induction Motor Under
Stator Faults,” IEEE Transactions on Industrial Electronics, vol.
60, NO.9, September 2013, pp. 4093-4101