Abstract
This paper presents the impact of neutral resistor grounding of a power transformer on voltage sag and temporary overvoltage (TOV) caused by single line to ground (SLG) faults. The simulations were carried out on a modified 22kV distribution system of provincial electricity authority (PEA). It can be obtained from the study results that the installation of neutral grounding resistors (NGR) has an advantage in reducing voltage sag but has a disadvantage in introducing TOV. While the cost of voltage sag is reduced, TOV can be so significant that it can damage surge arresters installed at distribution transformers and therefore replacing surge arresters with ones having a higher voltage rating is required. A sensitivity analysis was carried out by varying the ohmic value of NGR. The study results are useful to determine the proper NGR that can offers a compromise solution between cost of voltage sag and cost of equipment replacement.
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