CAJ | 학술논문

对变压器低压侧区内故障差动保护动作较慢的情况做了详细分析，指出其原因为并联电容器中的串联电抗器引起故障时刻并联电容器发生振荡放电，导致变压器励磁涌流判据闭锁差动保护。并分析了并联电容器振荡放电频率与电容器选型的关系，其产生的谐波分量对变压器励磁涌流判据的影响。通过EMTDC进行了仿真研究，提出了对变压器差动保护的励磁涌流判据的建议。
대변압기저압측구내고장차동보호동작교만적정황주료상세분석，지출기원인위병련전용기중적천련전항기인기고장시각병련전용기발생진탕방전，도치변압기려자용류판거폐쇄차동보호。병분석료병련전용기진탕방전빈솔여전용기선형적관계，기산생적해파분량대변압기려자용류판거적영향。통과EMTDC진행료방진연구，제출료대변압기차동보호적려자용류판거적건의。
According to the slower operation of differential protection of internal fault in low voltage side of transformer , the reason is analyzed that the selection of serial reactor in the parallel capacitors leads to the oscillation discharge during the fault.And the transformer differential protection is blocked by transformer inrush criterion .Then the relationship between the oscillation discharge frequency of parallel capacitor and the type selection of capacitor is analyzed as well as the effects of har -monic component on transformer inrush criterion .Through the EMTDC simulation , the advices for the inrush current criteria of transformer differential protection are proposed .