DGVCL EXAM PAPER (11-12-2011) QUIZ

Approximate method

De-coupled method

Gauss-Siedal

Newton-Raphson

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

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

A definite time cuttent characteristic

Double line to ground faults

Phase to phase faults

Three phase short ciruits

Single line to ground faults

Logic

Hardware

Software

Algorithm

Direct stoke on tower top

Direct stroke on ground wire

Indirect stroke on conductor

Direct stroke on line conductor

Tripping for minor faults and alarm for major faults

Tripping for major faults and alarm for minor faults

Tripping for both major and minor faults

Alarm for both major and minor faults

Special wires

Modem

Telephone line

Interface card

UPS

Modem

Keyboard

CPU

Close circuit breaker-close isolator - open earthing switch

Open isolator close circuit breaker-open earthing switch

Close earthing switch - open ciruit- breaker-open islotor

Open circuit breaker-open isolator-close earthing switch

Voltage controlled over current relay

Voltage restrained directional relay

Directional restrained over voltage relay

Directional restrained over current relay