The load side fault current is harmful to the main power transformer dynamic- and thermal-stability or even equipment itself. The influence is even more severe with inappropriate protection configurations or settings. One damaged main power transformer due to multiple substation exit short-circuit faults was analyzed with the operation data, preventive experiment data, simulation results and the actual damage scenario. The precautionary measures such as improved operation maintenances, post-fault experiments and comprehensive protection configurations were proposed.%在电力系统中,负荷侧各种故障状态下的故障电流均会对主变压器的动稳定和热稳定构成威胁,甚至造成破坏.当保护配置或定值失当时,这种影响将更加严重.针对某变电站变压器绕组变形损坏事故,结合该变压器近几年预防性试验数据、仿真校验结果、损坏情况以及实际运行情况,分析其损坏原因,发现是因多次出口短路造成主变压器动稳定破坏进而致使绕组变形,由此提出加强运行维护、开展短路后的检查试验及全面配置相关保护等防范措施.对防止此类事故再次发生有借鉴意义.
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