CAJ | 학술논문

500 kV变电站主变压器中压侧失灵判据的目的是为了中压侧开关失灵之后通过主变压器后备保护来跳三侧开关，隔离中压侧故障点，避免电网事故的扩大。失灵启动必须满足两条件：一是保护动作不返回；二是存在失灵电流。当在特殊区域发生故障时，若两者配合不好将引起保护的拒动，故障不能及时切除，将会影响主变压器设备的安全及电网的稳定。基于此，以某500 kV变电站主变压器保护配置为例来分析其隐患，并提出相应的对策，希望对此类工程设计和二次验收提供一定的实用参考价值。
500 kV변전참주변압기중압측실령판거적목적시위료중압측개관실령지후통과주변압기후비보호래도삼측개관，격리중압측고장점，피면전망사고적확대。실령계동필수만족량조건：일시보호동작불반회；이시존재실령전류。당재특수구역발생고장시，약량자배합불호장인기보호적거동，고장불능급시절제，장회영향주변압기설비적안전급전망적은정。기우차，이모500 kV변전참주변압기보호배치위례래분석기은환，병제출상응적대책，희망대차류공정설계화이차험수제공일정적실용삼고개치。
The failure criterion in medium -voltage side of main transformer in 500 kV substation are designed to trip three sides through the backup protection of main transformer when the medium -voltage side breaker failed to jump , so as to isolate the fault point in medium -voltage side and avoid the expansion of the accident in power grid .The malfunction start-up must meet the following two conditions:the protection lasting action and failure current .When the failure occurs in a special area , a bad combination of the two factors will cause the protection to refuse to trip , and the fault cannot be removed , which will in-fluence the security of main transformer equipment and the stability of the grid .On this basis, taking the protection configura-tions of main transformer in a 500 kV substation for example , the hidden dangers are analyzed and the appropriate counter-measures are proposed , which provides some practical references for such engineering design and secondary acceptance .