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Keywords

distribution networks, ground capacitance measurement, grounding transformer, tap

Abstract

The traditional measurement method of distribution network grounding capacitance is greatly affected by the neutral grounding mode, and cannot eliminate the influence of harmonic elimination resistance and internal impedance of voltage transformer on the measurement accuracy. For this reason, an accurate measurement method of distribution network grounding capacitance that is not affected by the neutral point grounding mode is proposed. By using the Y/△ connection grounding transformer with tap connected externally to the distribution network, the zero sequence voltage of the distribution network is ensured to change within the specified offset value by adjusting the grounding tap of the high voltage side winding of the grounding transformer to a lower gear, and the required zero sequence voltage and current are measured to obtain the system grounding capacitance. The proposed method is simulated and analyzed in PSCAD/EMTDC simulation environment. The analysis results show that the method has high measurement accuracy, and the measurement process of grounding capacitance is safe, simple and economical.

DOI

10.19781/j.issn.1673-9140.2022.05.012

First Page

109

Last Page

114

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