基于接地变压器绕组分级调节的配电网对地电容精确测量方法  被引量:4

Accurate measurement method of distribution network-to-ground capacitance based on graded adjustment of grounding transformer windings

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作  者:吴丽芳 白浩 欧阳健娜 袁智勇 李珊 WU Lifang;BAI Hao;OUYANG Jianna;YUAN Zhiyong;LI Shan(Electric Power Science Research Institute,Guangxi Power Grid Co.,Ltd.,Nanning 530023,China;Electric Power Seience Research Institute,CSG,Guangzhou 510663,China)

机构地区:[1]广西电网有限责任公司电力科学研究院,广西南宁530023 [2]南方电网科学研究院有限责任公司,广东广州510663

出  处:《电力科学与技术学报》2022年第5期109-114,共6页Journal of Electric Power Science And Technology

基  金:广西电网有限责任公司科技项目(ZBKJXM20190061)。

摘  要:传统配电网对地电容测量方法受中性点接地方式的影响较大,且无法消除消谐电阻和电压互感器内阻抗对测量精度的影响。为此,提出一种不受中性点接地方式影响的配电网对地电容精确测量方法,利用配电网外接特制的带有分接抽头的Y/△接线接地变压器,通过调节接地变压器高压侧绕组接地抽头到较低档位来确保配电网零序电压在规定偏移值内变化,并通过测量得到所需零序电压和零序电流,得到系统对地电容;并在PSCAD/EMTDC仿真环境中对所提的对地电容测量方法进行仿真分析,分析结果表明:该方法测量精度高,且对地电容电流测量过程具有安全、简便、经济的特点。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.

关 键 词:配电网 对地电容测量 接地变压器 分接抽头 

分 类 号:TM76[电气工程—电力系统及自动化]

 

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