The distribution system usually adopts the low current grounding system,that is,the neutral point of the system is not grounded or the grounding is through the large inductance.In the distribution system with double power source,power direction element is needed for current protection to identify the fault direction.Aiming at the two-phase ground short-circuit fault at the positive direction outlet of the protection installation and the two-phase ground short-circuit fault at the positive direction far end of the protection installation,the action behavior of the power direction element when the two-phase ground short-circuit fault occurs in the low current grounding system was analyzed in detail.It is concluded that the power directional element can accurately identify the fault direction when the two-phase ground short-circuit fault occurs in the low current grounding system under the typical internal angle setting value of power direction element.
Low Current Grounding SystemShort CircuitPower Direction ElementOperation
万方数据
维普
