The differential current calculation of the 110kV double bus single segment connection mode

This paper gives detailed analysis to the 110 kV bus differential protection´s configuration and basic principal under the condition of 110 kV main electrical wiring being double bus single segment in the 220 kV substations. On the other hand, the calculation formulas of bus bar´s differential current are also been analyzed in detail, which are under all kinds of bus coupler and segment switch´s operating circumstances. This analysis gives foundation to the timely judgment, finding and discovery of the faults under this connection mode.