Analysis of a Failure of Debugging on a Differential Trip
When a differential protection in a substation of Urban Power Supply Company of SMEPC is debugging,it is found that differential protection starts only in one side of the two substations after the fault current produced.Firstly,the principle of differential protection,PCS943 differential relay logic is analyzed.The reasons for the refusal of trip is calculated.Temporary improvement measures is listed.Finally,the further solutions is given.
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