变压器差动保护单相接地灵敏度分析

Sensitivity analysis of the transformer differential protection while single-phase grounding

变压器差动保护电流相位调整通常采用Y→△变换 ,在单相故障时灵敏度低于相间短路与三相短路灵敏度。分析了各种电流相位调整方法在单相接地时的灵敏度 。

Y→△transformation is conventionally used by CT secondary current phase adjusting of transformer differential protection while its sensitivity of single phase to earth fault is lower than that of three phase fault and interphase fault.The paper gives a analysis to all kinds of adjusting methods of CT secondary current phase and shows that the sensitivity of △→Y transformation is the highest.