Zero-sequence-component-based Fault Diagnosis of Multi-branch Collector Lines in Wind Farms
Due to special winding wiring mode of wind farm Z-type transformers,a unique zero-sequence current circuit will be formed when 35 kV collector lines encounter grounding faults.In view of this,from the perspective of zero sequence components in collector lines,the present work studied a scheme of determining fault interval using coefficient values of the zero-sequence current circuit,which can avoid the impact of grounding impedance and zero sequence capacitance on diagnosis process.And the accurate fault point determining method was thereby realized by monitoring zero sequence current traveling wave and utilizing the principle of uni-/bi-terminal traveling wave location.The proposed method is effective regardless of grounding resistance and fault distance,and can save equipment cost in coping with faults in multi-branch collector lines.
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