DGVCL Exam Paper (11-12-2011)
The bus bar zone faults are generally

Double line to ground faults
Single line to ground faults
Phase to phase faults
Three phase short ciruits

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

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

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