35 kV光伏电站箱变高压熔断器慢熔故障分析及预防措施OA

The high-voltage current-limiting fuse is an important electrical equipment to protect electrical equipment from current over-load and short-circuit current damage.A 35 kV photovoltaic power station box transformer C-phase high-voltage current-limiting fuse occurs a slow melting fault,resulting in zero-sequence overcurrent I.section protection action,and finally causes the collector line switch to trip.According to the on-site fault recording diagram,the dismantling inspection of the box transformer manufacturer and the breakdown position of the fuse cylinder.The analysis finds that the screw loosening at the crossbar connection of the high-voltage side of the box transformer leads to the temperature of the C-phase high-voltage fuse to rise,and then the slow melting fault.In view of this incident,it gradually analyzes the cause of the failure and proposes the corresponding preventive measures,which has certain refer-ence value for improving the operation reliability of the box transformer of the photovoltaic power station in the future.