Why does the phase voltage of two healthy phases become
equal to the line voltage in case of an ungrounded neutral
3 phase star connected sytem when a single line to ground
fault occurs ?
Answers were Sorted based on User's Feedback
Answer / shahzad
in my point of view that the when single line to ground
fault occurs that phase return and then we get phase
voltage of two healty phaase become equal
Is This Answer Correct ? | 1 Yes | 1 No |
Answer / nithi
The question what u have asked is technically termed
as "ARCING GROUND".
DUE TO VIRTUAL CAPACITANCE, THE VOLTAGE B/W THE LINE -
GROUND IS ALWAYS PHASE VOLTAGE.BUT IN THE CASE OF LINE-
GROUND FAULT IN UNGROUNDED SYSTEM,THE GROUND & THE
TRANSFORMER BODY ITSELF ACT AS A PHASE (AS THERE IS DIRECT
CONTACT WITH GROUND).
this is cumulative effect,due to capacitance again the
voltage b/w the line to ground keeps on increasing.this
will increase the pressure on the insulation,arcing
occurs,ultimately leads to breakdown of the system.
Is This Answer Correct ? | 0 Yes | 0 No |
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