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Keywords

grounding leakage resistance of distribution network, shunting tap, grounding transformer, open delta voltage transformer, zero sequence current transformer

Abstract

Asmost of the traditional measurement methods for the ground parameters of distribution network are mainly focus on the accurate measurement of the grounding capacitance, the grounding leakage resistance measurement is not accurate. The influence of the harmonic elimination resistance and the internal impedance of the voltage transformer is impossible to be eliminated during the measurement of the ground parameters. The issues mentioned above may result in a large error in the grounding leakage resistance measuring result.Furthermore, traditional measurement methods cannot be widely applied to different system grounding methods, and practical application is relatively inconvenient. To this end, this paper proposes a method for measuring the grounding leakage resistance of distribution network based on zero-sequence voltage regulation. In the proposed method, a small zero sequence voltage is obtained byselecting the appropriate shunting tapon a special Y/△-connected grounding transformer with shuntingtaps in the distribution network to ground.The corresponding zero sequence current of the system is measured.The grounding leakage resistance of the system can be calculated through the obtainedvoltage and current values. The PSCAD/EMTDC simulation software is used to verify and analyze the proposed grounding leakage resistance measurement method. The simulation resultsshow thatthe calculation method is applicable to different system connection mode with small measuring error,which indicates that theproposed method has the advance of high measurement accuracy, wide applicability, safety, economy and convenient use.

DOI

10.19781/j.issn.1673-9140.2022.03.015

First Page

126

Last Page

132

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