Abstract
The measurement of grounding system impedance of in-service power facilities is a very complex issue since the power system frequency interference and harmonic frequencies may adversely affect the measurement. Recently, to overcome this problem the Frequency Shift Method (FSM) has been proposed. FSM requires that two of three test frequencies must be above power system frequency (in our case 50 Hz). However, due to the nonlinear dependence of the grounding system impedance versus frequency, the choice of test frequencies is not arbitrary. In this paper, this issue is experimentally examined based on the analysis of grounding system impedance linearity range. For this purpose, the grounding system impedance, for a sample of 16 substations (HV and MV), is examined. We find that the highest test frequency should be ≤80 Hz.
Highlights
KOSTIĆThe measurement of grounding system impedance of in-service power facilities is a very complex issue since the power system frequency interference and harmonic frequencies may adversely affect the measurement
The grounding system has an important role to maintain safe and reliable operation of power facility
We are interested for range of the linear part of ground impedance in the circumstances when the grounding grid is heavy reactively loaded by connected cables and/or overhead ground wires
Summary
The measurement of grounding system impedance of in-service power facilities is a very complex issue since the power system frequency interference and harmonic frequencies may adversely affect the measurement. To overcome this problem the Frequency Shift Method (FSM) has been proposed. Due to the nonlinear dependence of the grounding system impedance versus frequency, the choice of test frequencies is not arbitrary In this paper, this issue is experimentally examined based on the analysis of grounding system impedance linearity range. This issue is experimentally examined based on the analysis of grounding system impedance linearity range For this purpose, the grounding system impedance, for a sample of 16 substations (HV and MV), is examined. We find that the highest test frequency should be≤80 Hz
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