CAJ | 학술논문

在Y0/Y0或Y0/Δ接线的变压器的Y0侧非常接近中性点处或Δ侧接近顶点处发生相间短路时,由于短路的匝数很少,短路电流很小,任何保护都可能拒动,亦即任何保护都具有一定的死区.该文分析Y0/Y0接线变压器纵差动保护死区的存在以及影响死区大小的因素,推导死区边缘两相短路时差电流的计算公式,作为保护整定的依据.
재Y0/Y0혹Y0/Δ접선적변압기적Y0측비상접근중성점처혹Δ측접근정점처발생상간단로시,유우단로적잡수흔소,단로전류흔소,임하보호도가능거동,역즉임하보호도구유일정적사구.해문분석Y0/Y0접선변압기종차동보호사구적존재이급영향사구대소적인소,추도사구변연량상단로시차전류적계산공식,작위보호정정적의거.
When phase fault is close up to the neutral point at the Y0side and near the apex at theΔ side of theY0/Y0or Y0/Δ wiring transformers, because the short circuit turns are few and the short circuit current is small, any protection may refuse to operate, that is any protection has certain dead-zone. The existence of the longitudinal differential protection dead-zone of Y0/Y0wiring transformers and the factors affecting the size of the dead-zone are analyzed. The calculation formula of differential current when two-phase short-circuit happens at the edge of the dead-zone is deduced, which is regarded as a basis for protection setting.