Incident Analysis of Excessive Acetylene From a 1000 kV Shunt Reactor due to Transient Operations

This study focuses on long-term monitoring and in-depth analysis of an excessive acetylene (C2H2) incident in a 1000 kV shunt reactor due to switching operations. It includes a detailed description of incident development, in-depth analysis of dissolved gases in the oil, comprehensive discussions on discharge information and vibration information under switching processes and steady-state conditions. The study obtained valuable field data. Furthermore, through the disassembly, the accuracy of the analysis methods was validated, revealing the cause of the fault and its discharge mechanism. This provides a basis for improving reactor production processes and structural optimization. Importantly, during the incident analysis, a new insight was gained regarding the interpretation of dissolved gases in the oil. A strategy for distinguishing discharge signals from switch interference was proposed, along with the establishment of criteria for judging the non-uniformity of defect electric fields based on TAFI (Time arrival feature index) patterns.