DGVCL Exam Paper (11-12-2011)
In carrier current protection, the purpose of the wave trap is for

Trapping power frequency waves
Trapping high frequency waves entering into generator/transformer unit.
Tripping fault current
All of these

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DGVCL Exam Paper (11-12-2011)
An IDMT relay provides

A definite time characteristic for low values of the failt current and an inverse characteristic for high values of the fault current
A definite time cuttent characteristic
An inverse time current characteristic
An inverse characteristic for low values of the fault current and a definite time characteristic for high values of the fault current

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