断线故障引起的电压异常分析与研究

摘要

在10kV接地系统中，单相接地现象最为普遍，也最易判别。但电压断线现象时有发生，且变电运维人员对电压断线后电压变化规律从原理上难以理解。因此本文就两次10 kV单相接地系统中的两起电压异常事件进行了分析判断，并通过详细数学模型阐述变化规律，对运维人员判断断线事故并快速正确处理类似故障具有较好的借鉴意义。%Single-phase grounding is common in 10kV power system, it is easy to judge single-phase grounding fault. But breakage often occurs, and it is difficult to comprehend breakage fault in theory for substation operation and maintenance workers. This paper delivers vivid analysis and judgement of abnormal voltage change caused by two breakage faults, and the mathematic model and fluctuation rule is elaborated in detail. These analysis and research provide valuable reference for substation operation and maintenance workers to judge and handle similar faults rapidly in future.