220千伏变电站主变非电量误动作事件解析

220 kV Substation Main Transformer Non-Electrical Quantity Misoperation Event Analysis

摘要: 根据220 kV某变电站1号主变回路两点接地，使非电量跳闸回路导通，导致主变三侧开关分闸事件进行详细分析，从多方面对该事件发生的过程及原因进行解析。首先，对该事件的发生时间和现场调查情况进行概述；之后，结合现场调查的主变本体状况，对非电量回路两点接地进行过程性分析；最后，结合220 kV主变非电量保护特征，提出了相应的预防措施。

Abstract: According to a 220 kV substation No. 1 main transformer circuit two grounding, so that the non-power trip circuit open, resulting in the main transformer three-side switch events are analyzed in detail, this paper analyzes the process and reason of the event from many aspects. Firstly, the time of the incident and the situation of field investigation are summarized, then, the process of two-point grounding of non-power loop is analyzed according to the condition of main transformer, according to the non-electric protection characteristics of 220 kV main transformer, the corresponding preventive measures are put forward.