请高手帮忙分析：电压互感器爆裂原因

请高手帮忙分析：电压互感器爆裂原因
电压互感器型号：JDZX10 0.5/6P 50/150VA
下面是运行记录：
2009/4/2 9:3:36,五一路开闭所,五一路开闭所预告警总复归,遥信变位,报警信号,,,,
2009/4/2 9:3:36,五一路开闭所,五一路开闭所721开关线路接地,遥信变位,设备接地,,,,
2009/4/2 9:3:40,五一路开闭所,五一路开闭所事故总复归,遥信变位,由分到合,,,,
2009/4/2 9:4:38,五一路开闭所,五一路开闭所预告警总复归,遥信变位,报警复归,,,,
2009/4/2 9:4:41,五一路开闭所,五一路开闭所事故总复归,遥信变位,由合到分,,,,
2009/4/2 9:8:32,五一路开闭所,五一路开闭所722线路PT断线,遥信变位,报警信号,,,,
2009/4/2 9:8:35,五一路开闭所,五一路开闭所预告警总复归,遥信变位,报警信号,,,,
2009/4/2 9:8:39,五一路开闭所,五一路开闭所事故总复归,遥信变位,由分到合,,,,
2009/4/2 9:9:33,五一路开闭所,五一路开闭所预告警总复归,遥信变位,报警复归,,,,
2009/4/2 9:9:41,五一路开闭所,五一路开闭所事故总复归,遥信变位,由合到分,,,,
2009/4/2 9:11:46,五一路开闭所,五一路开闭所交流1路投入,遥信变位,预报警复归,,,,
2009/4/2 9:11:48,五一路开闭所,五一路开闭所700分段过流I段,保护,保护动作,,,,
2009/4/2 9:11:48,五一路开闭所,五一路开闭所事故总复归,遥信变位,由分到合,,,,
2009/4/2 9:11:48,五一路开闭所,五一路开闭所721开关过流I段,保护,保护动作,,,,
2009/4/2 9:11:48,五一路开闭所,五一路开闭所721开关过负荷,遥信变位,报警信号,,,,
2009/4/2 9:11:48,五一路开闭所,五一路开闭所交流1路投入,遥信变位,预报警信号,,,,
2009/4/2 9:11:48,五一路开闭所,五一路开闭所交流失电,遥信变位,报警信号,,,,
2009/4/2 9:11:48,五一路开闭所,五一路开闭所直流屏交流欠压,遥信变位,预报警信号,,,,
2009/4/2 9:11:48,五一路开闭所,五一路开闭所交流失电,遥信变位,报警复归,,,,
2009/4/2 9:11:50,五一路开闭所,五一路开闭所721开关过流III段,保护,保护动作,,,,
2009/4/2 9:11:52,五一路开闭所,五一路开闭所直流屏交流欠压,遥信变位,预报警复归,,,,
2009/4/2 9:11:52,五一路开闭所,五一路开闭所预告警总复归,遥信变位,报警信号,,,,
2009/4/2 9:11:58,五一路开闭所,五一路开闭所10kV室烟雾报警,遥信变位,事故总信号,,,,
2009/4/2 9:12:48,五一路开闭所,五一路开闭所事故总复归,遥信变位,由合到分,,,,
2009/4/2 9:12:52,五一路开闭所,五一路开闭所预告警总复归,遥信变位,报警复归,,,,