Sensitivity check for radio frequency partial discharge detection for power transformers
Sensitivity check for radio frequency partial discharge detection for power transformers
复制标题
电力变压器射频局部放电检测的灵敏度检查
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
S. Tenbohlen
中科院分区：
文献类型：
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作者：
S. Meijer;M. Judd;S. Tenbohlen
电力和配电变压器构成电网的重要组成部分。这些重要部件的故障可能导致高昂的费用（例如修理费用和不交货费用）。因此，确定变压器故障风险的方法是重要的。众所周知，由于绝缘缺陷引起的故障通常在局部放电活动之前。近年来，已经研究了用于电力变压器的在线诊断手段。在本文中，这些方法之一，超高频局部放电检测技术的灵敏度进行了分析，在几个变压器。从这些实验中，超高频技术检测电力变压器中的局部放电的灵敏度已经建立。基于这些结果，本文提出了一种类似于用于GIS的灵敏度检查。Transformer结构带来的一些额外挑战将根据其对所需检测灵敏度的影响以及变压器运行时可能存在的局部放电水平进行讨论。还将概述在现场测试期间应用该技术的一些替代实用方法
Power and distribution transformers form important components in the electricity grid. Failure of such important components can give rise to high costs (such as costs for repair and cost for non-delivery). Therefore methods to determine the risk of failure of transformers are of importance. It is known that failure due to insulation defects is often preceded by partial discharge activity. Over recent years, on-line diagnostic means for power transformers have been investigated. In this paper the sensitivity of one of these methods, the UHF PD detection technique, has been analyzed on several transformers. From these experiments, the sensitivity of the UHF technique to detect partial discharges in power transformers has been established. Based on these results, a sensitivity check similar to the one used for GIS is proposed in this paper. Some of the additional challenges posed by the transformer structure will be discussed in terms of their effect on the detection sensitivity that is needed and the PD levels that might be present while transformers are in service. Some alternative practical methods for applying the technique during on-site tests will also be outlined