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基于极化-去极化电流方法的交联聚乙烯电缆绝缘无损检测

DOI: 10.13336/j.1003-6520.hve.2015.08.015, PP. 2643-2649

Keywords: XLPE电缆,绝缘,极化,去极化,无损,老化,拟合

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Abstract:

为了准确评估配电网中运行的交联聚乙烯(XLPE)电缆的绝缘状态,基于极化-去极化电流(PDC)特征参数的无损检测装置和相关评估方法进行了研究。选取不同长度的新电缆与老化电缆为研究对象,采用极化-去极化电流(PDC)方法来无损检测了电缆绝缘性能。通过对比不同电缆的去极化放电电流曲线可以发现放电初期,在短时间内电流由μA级骤降至nA级,该过程中老化电缆放电速率比新电缆更快;经过较长时间,电流由nA级降至pA级,最终稳定在pA级,此时老化电缆放电电流值远大于新电缆,电缆充电电压越高且充电时间越长,去极化电流值就越大。最后通过对实验数据进行非线性拟合计算,分析得到了拟合曲线与电缆绝缘层中介电常数和电导率的关系。研究结果印证了基于PDC方法检测XLPE电缆绝缘状态的准确可靠性。

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