CAJ | 학술논문

基于差流谐波正序分量的变压器励磁涌流判据能够有效识别励磁涌流和内部故障。为了进一步提高差动保护的励磁涌流闭锁可靠性和内部故障动作快速性，分析了变压器端电压及其基波正序分量突变量在励磁涌流和内部故障时的不同特征，由此确定了自适应控制因子Q，并将Q加入到差流谐波正序分量的励磁涌流判据中，进而提出了一种自适应变压器励磁涌流新判据。大量EMTP仿真及动模实验表明：新判据能够在励磁涌流时自动降低涌流制动定值，提高涌流的闭锁可靠性；在内部故障时自动升高涌流制动定值，提高区内故障时保护的动作速度。
기우차류해파정서분량적변압기려자용류판거능구유효식별려자용류화내부고장。위료진일보제고차동보호적려자용류폐쇄가고성화내부고장동작쾌속성，분석료변압기단전압급기기파정서분량돌변량재려자용류화내부고장시적불동특정，유차학정료자괄응공제인자Q，병장Q가입도차류해파정서분량적려자용류판거중，진이제출료일충자괄응변압기려자용류신판거。대량EMTP방진급동모실험표명：신판거능구재려자용류시자동강저용류제동정치，제고용류적폐쇄가고성；재내부고장시자동승고용류제동정치，제고구내고장시보호적동작속도。
The criterion of transformer magnetizing inrush current based on positive sequence component of differential current harmonics can identify inrush and internal fault effectively. In order to further improve the blocking reliability in magnetizing inrush current cases and operation speed in internal fault cases of differential protection, terminal voltage and its mutation in positive sequence component of fundamental harmonic are analyzed respectively in magnetizing inrush cases and internal fault cases. According to their different characteristics, an adaptive control factor Q is determined, which is added to the magnetizing current criterion based on positive sequence of differential current harmonics, then a new adaptive criterion of transformer magnetizing inrush current is proposed. A large number of EMTP simulations and dynamic simulation experiments show that the new criterion can automatically decrease the threshold setting of restraint in inrush cases, so the reliability of inrush blocking is improved, and it can also automatically increase the threshold setting of restraint in internal fault cases, so the operation speed during internal fault conditions is accelerated.