光伏电站箱变保护拒动原因分析与处理

Cause Analysis and Treatment of Box Transformer Protection Rejection in Photovoltaic Power Plant

光伏电站所在地区辐照好、环境温度高,电站在检查中发现,存在箱变超温跳闸保护拒动、高压负荷开关拒动、高压侧负荷开关联跳低压断路器拒动、手动分闸按钮失效等情况。对箱变进行系统排查后,调整保护间隙、处理拒动缺陷后保护正确动作,保证光伏电站箱变在高温下能安全稳定运行,避免箱变保护拒动损坏设备、越级跳集电线路断路器。

Photovoltaic power plant is located in a region with good radiation and high ambient temperature.During the inspection,it is found that there are some conditions such as box transformer overtemperature trip protection rejection,high voltage load switch rejection,high voltage side load switch intertrip low voltage circuit breaker rejection,manual switch-off button failure,etc.After system investigation of the box transformer,the protection clearance is adjusted,and the protection action is correct after handling the rejection defect,which ensures the safe and stable operation of the box transformer in photovoltaic power plant at high temperature and avoids dynamic damage to equipment and circuit breakers of jump-over collector lines.