中性点接地电阻监测方案

Conference Record of the 2004 IEEE International Symposium on Electrical Insulation Pub Date : 2004-09-19 DOI:10.1109/ELINSL.2004.1380608

M. T. Al-Hajri

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引用次数: 7

摘要

过去几年中，中东一家配电工业/公用事业公司的住宅变电站发生了多起中性点接地电阻器 [NGR] 故障。这些 NGR 安装在配电系统变压器的中性点上，用于限制接地故障电流。这些 NGR 的故障导致配电系统不接地。在未接地的电力系统中，相地故障的存在会导致其他两个健康相位的相地电压升高，从而导致绝缘击穿和电气设备故障。这项工作旨在开发两种方案，并对第三种现有商业方案进行评估，以检测 NGR 故障。

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Neutral ground resistor monitoring schemes

One distribution industrial/utility company in the Middle East has experienced several neutral ground resistor [NGR] failures during the past few years at its residential substations. These NGR's are installed in the neutral of the distribution power system transformers to limit the ground fault current. The failure of these NGR's caused the distribution system to be ungrounded. The existence of a phase to ground failure in the ungrounded power system leads to phase to ground voltage build-up in the other two healthy phases which can result in insulation breakdown and electrical equipment failures. This work is aimed at the development of two schemes and the evaluation of a third commercial existing scheme to detect NGR's failures.

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Conference Record of the 2004 IEEE International Symposium on Electrical Insulation

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