DGVCL Exam Paper (11-12-2011)
Bulk power transmission over long HVDC lines are preferred on account of

No harmonic problems
Minimum line power losses
Simple protection
Low cost of HVDC terminals

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DGVCL Exam Paper (11-12-2011)
Buchholz relay causes

Tripping for both major and minor faults
Tripping for major faults and alarm for minor faults
Alarm for both major and minor faults
Tripping for minor faults and alarm for major faults

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