The results of power grid research modes in case of 6–10 kV overhead lines phase wire breakage

A. Ershov, A. V. Khlopova, A. Sidorov
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引用次数: 2

Abstract

Broken wire overhead lines 6-10 kV, supplying electrical networks 6-10 / 0.38 kV, cause a reduction in the quality of the resulting electric energy consumers, creating a fire hazard in an overhead line fault zone and increasing the probability of a passer-by's electrocution, which is lethal in most cases. For the construction of an overhead line protection of 6-10 kV in case of phase wire breakage, the information on the negative sequence voltage that appears at the side of a low voltage power transformer with 6-10 / 0.4 kV voltage can be used. These methods were used for the analysis of the negative sequence voltage changes: the method of symmetrical components; computer and physical modeling; experimental studies in mains voltage of 10 / 0.38 kV. It was established that there are various kinds of asymmetric modes of the mains voltage of 0.38 kV under a normal 6-10 kV airline causing minor changes of the negative sequence voltage, not exceeding 0.02 per unit of the line voltage. In case of the 6-10 kV overhead line phase wire breakdown and an unbalance change of consumers phase loads with voltage 0.38 kV in a wide range, the value of the negative sequence voltage varies within 0.2-1.0 per unit of the line voltage. The studies have allowed the authors to define the limit values set point for the negative sequence voltage protection in case of the 6-10 kV overhead line phase wire breakage.
6 - 10kv架空线路断相时电网研究模式的结果
6-10千伏架空线路断裂,供电网络6-10 / 0.38千伏,导致电力消费者的质量下降,在架空线路故障区域产生火灾危险,并增加路人触电的可能性,这在大多数情况下是致命的。对于6- 10kv架空线路断相保护的施工,可采用电压为6-10 / 0.4 kV的低压电力变压器侧出现的负序电压信息。这些方法用于分析负序电压变化:对称分量法;计算机和物理建模;10 / 0.38 kV市电电压下的实验研究。确定了在正常6-10 kV航线下,0.38 kV市电电压存在各种不对称模式,引起负序电压的微小变化,每单位线路电压不超过0.02。当6- 10kv架空线路相线击穿,电压为0.38 kV的用户相负荷在较大范围内发生不平衡变化时,负序电压值在每单位线路电压0.2-1.0范围内变化。通过研究,确定了6- 10kv架空线路相线断线时负序电压保护的设定值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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