Single-phase earth fault selection method of DC (Direct Current) transmission line
A single-phase ground fault, DC transmission line technology, applied in the direction of the fault location, etc., can solve the problems of insufficient ability to withstand transition resistance and decreased protection reliability
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[0079] Such as Figure 6 , a high-voltage direct current transmission line traveling wave protection method with high sensitivity, comprising the steps in the following order:
[0080] 1) Power on the relay protection device;
[0081] 2) Assign value to traveling wave protection fixed value △ 1 , △ 2 ; where △ 1 It is the start-up setting value of the ground electrode voltage for this fault line selection method; △ 2 It is the judgment value for the unidirectional change time of the ground electrode voltage;
[0082] 3) Measure the local line voltage U dN ;
[0083] 4) Calculate the average value U of the ground electrode voltage dN-AVG ;
[0084] U dN - AVG ( n ) = U dN ( n ) + ...
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