Measurement technology of grounding leakage resistance of distribution network based on zero sequence voltage regulation
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    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.

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白浩,欧阳健娜,潘姝慧,吴丽芳,袁智勇.基于零序电压调控的配电网对地泄漏电阻测量技术[J].电力科学与技术学报英文版,2022,37(3):126-132. BAI Hao, OUYANG Jianna, PAN Shuhui, WU Lifang, YUAN Zhiyong. Measurement technology of grounding leakage resistance of distribution network based on zero sequence voltage regulation[J]. Journal of Electric Power Science and Technology,2022,37(3):126-132.

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  • Received:
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  • Online: July 24,2022
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