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what is diffential relay? testing proceure?and
transformer reach Over load thet time differencilal relay
operate or not ?
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Answer Posted / m raviteja
differential relay is the difference of current from
primary and secondary of the transformer.Normally setting
is at 0.6% if more than that the transformer will tripped
on that relay fault.
the primary current and secondary currents are connected to
individual ct's and that terminals are connected to relay.
differential relay is of two types voltage based and
current based.Normally current based is used in industries.
testing procedure:both primary and secondary currents are
induced to relay and make the required setting if current
difference is more than that the relay acts.
differential relay will not operate when overload the
transformer unless the difference in primary and secondary
currents
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