Title :
Evaluation of the effect of salt water and a counterpoise on the voltage profile of a HV power transmission line grounding system in a two layer with high resistivity soil
Author :
Georges, S. ; Slaoui, F. ; Lagacé, P.J. ; Do, X.D. ; Fortin, J.
Author_Institution :
Dept. of Electr. Eng., Ecole de Tech. Superieure, Montreal, Que., Canada
Abstract :
Soil resistivity plays a key role in designing grounding systems of high voltage transmission lines and substations. This paper deals with an already in service HV utility, it is a 69 kV transmission line with a power generation plant at one end and a transformation substation at the other. What makes this case very interesting is that this installation is located in a high soil resistivity area, at the same time as being in the vicinity of sea water with very low resistivity. It belongs to Hydro-Quebec and does not have a shield wire nor counterpoise. This research highlights the impact of the salt water in reducing the potential rise during an electrical fault and the effectiveness of the counterpoise when the resistivity of the soil is very high. The method of images from electromagnetics is applied to calculate the potential rise. All results are validated by experimental measurements performed by a specialized field test group from Hydro-Quebec
Keywords :
earthing; electrical resistivity; power transmission faults; power transmission lines; seawater; soil; 69 kV; HV power transmission line grounding system; Hydro-Quebec; counterpoise; electrical fault; high resistivity soil; power generation plant; salt water effect; substations; two layer soil; vertical fault; very low resistivity sea water; voltage profile; Conductivity; Electromagnetic shielding; Grounding; Power generation; Power transmission lines; Sea measurements; Soil; Substations; Voltage; Wire;
Conference_Titel :
Power Engineering Society Summer Meeting, 1999. IEEE
Conference_Location :
Edmonton, Alta.
Print_ISBN :
0-7803-5569-5
DOI :
10.1109/PESS.1999.787455
