配网绝缘渐损接地增量电流波形及选线定位分析
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周奕轩(1992),女,硕士研究生,主要从事智能配电网、传感技术和能源检测等研究;Email:15618228061@163.com

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TH411

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上海市电站自动化技术重点实验室资助(13DZ2273800);国家级大学生创新训练计划资助(201610290026);江苏省研究生科研与实践创新计划项目(SJCX17_0527)


Incremental current waveform analysis and lineselection faultlocation method for intermittent breakdown grounding in distribution network
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    摘要:

    为提高配网包括绝缘渐损接地在内的单相接地选线定位的可靠性,仿真观察绝缘渐损接地在不同阶段的电流波形。首先,根据这些电流波形及发展变化的共有规律,选择接地相的次暂态锯齿波增量电流和健全相与之对应时刻的增量电流作为配网绝缘渐损接地自举选线定位的判据信号源,分析锯齿波电流反映所有接地电流的通用性特点,并研究设计锯齿波标量和矢量相位差的计算方法;然后,仿真研究并比较包括锯齿波在内的单相接地电流与操作性、诱发性扰动电流的波形特征,为辨识真伪单相接地找寻判别基准,并以此为依据,研究设计包括绝缘渐损在内的配网单相接地防误辨识和选线定位方法;最后,采用所制作的接地定位器在低压配网模型的合环运行线路上验证所设计方法的正确性。

    Abstract:

    In order to improve the reliability of lineselection and faultlocation for singlephase grounding failures in distribution network, the current waveform at different stages were studied and stimulated. Firstly, in terms of the summarized common features of current waveforms during their development, the incremental current of the subtransient sawtooth wave in the grounding phase and the incremental current in the sound phase are selected as the criterion signal sources for the fault location of the insulation loss in distribution networks. The general characteristics of all grounding currents reflected by the saw tooth currents are analyzed. Then, the difference of waveform characteristics is analyzed between singlephase grounding current and operationinduced disturbance currents. It provides a criterion for identifying the authenticity of singlephase grounding failure. The line selection and location method are proposed for the singlephase grounding including the insulation loss to avoid misidentification. Finally, the proposed method is applied to the grounding locator in a low voltage distribution network model for verification.

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周奕轩,皮 杰,宋天宝,邹 运,杨丽丽,骆德昌.配网绝缘渐损接地增量电流波形及选线定位分析[J].电力科学与技术学报,2020,35(4):58-65. ZHOU Yixuan, PI Jie, SONG Tianbao, ZOU Yun, YANG Lili, LUO Dechang. Incremental current waveform analysis and lineselection faultlocation method for intermittent breakdown grounding in distribution network[J]. JOURNAL OF EIECTRIC POWER SCIENCE AND TECHNOLOGY,2020,35(4):58-65.

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  • 在线发布日期: 2020-09-04
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