Temporary Overvoltage and GPR Characteristics of Distribution Feeders With Multigrounded Neutral

Three-phase four-wire multigrounded neutral (MGN) is the preferred distribution line configuration in North America. Its performance characteristics, such as temporary overvoltage (voltage swell) and ground potential rise (GPR), are difficult to understand and assess due to the presence of a neutral conductor and the conductor's multiple grounding nature. The characteristics are further affected by unique parameters, such as grounding intervals and the coupling between neutral and phase conductors. This paper conducts analytical studies on the phenomena of temporary overvoltage and GPR associated with MGN configurations. The purpose is to reveal the mechanisms leading to the phenomena and their contributing factors. Approximate formulae are derived to quantify the impact of various factors. The findings are confirmed by the simulation results.

[1]  Michael Geselowitz,et al.  Vancouver , 1960, IEEE Ann. Hist. Comput..

[2]  Aaas News,et al.  Book Reviews , 1893, Buffalo Medical and Surgical Journal.

[3]  L. Levey.  Computation of fault currents and voltages along a multigrounded neutral power line having multiple phase conductors , 1991 .

[4]  M. V. Lat.  Determining temporary overvoltage levels for application of metal oxide surge arresters on multigrounded distribution systems , 1990 .

[5]  Y. Rajotte,et al.  Impedance of multigrounded neutrals on rural distribution systems , 1995 .

[6]  H. Wayne Beaty,et al.  Electrical Power Systems Quality , 1995 .

[7]  G. Valtorta,et al.  Temporary overvoltages due to ground faults in MV networks , 2009 .

[8]  T. Chen,et al.  Analysis of Multigrounded Four-Wire Distribution Systems Considering the Neutral Grounding , 2001, IEEE Power Engineering Review.

[9]  J. Burke,et al.  Distribution system neutral grounding , 2001, 2001 IEEE/PES Transmission and Distribution Conference and Exposition. Developing New Perspectives (Cat. No.01CH37294).

[10]  R. T. Mancao,et al.  The effect of distribution system grounding on MOV selection , 1993 .

[11]  G. Valtorta,et al.  Temporary overvoltages due to ground faults in MV networks , 2007, 2009 IEEE Bucharest PowerTech.

[12]  Lawrence Levey,et al.  A New Method of Analysis for Multigrounded Cable Shields Inductively And Conductively Coupled to Multigrounded-Neutral Power Lines , 1987, IEEE Transactions on Electromagnetic Compatibility.

[13]  Petar Vukelja,et al.  Insulation co-ordination for continuous operating voltages and temporary overvoltages , 2006 .

[14]  Kohei Oishi,et al.  Analysis of a neutral grounding method for a three-phase four-wire 11.4 kV distribution system , 2002, IEEE/PES Transmission and Distribution Conference and Exhibition.

[15]  Jun Yoshinaga,et al.  Study of neutral grounding for 22 kV distribution system , 2002, IEEE/PES Transmission and Distribution Conference and Exhibition.

[16]  Y. Rajotte,et al.  Characterization of the ground impedance of rural MV lines on Hydro-Quebec's system , 1997 .

[17]  L. Levey.  Calculation of Ground Fault Currents Using an Equivalent Circuit and a Simplified Ladder Network , 1982, IEEE Transactions on Power Apparatus and Systems.