Switchgear protections

less than

same as

more than

proportional to E. not directly related with

merz price percentage differential protection

mho and ohm relays

horn gaps and temperature relays

earth fault and positive sequence relays

hydro-electric generators

steam turbine generators

gas turbine generators

all of the above E. none of the above

low resistance

high resistance

low impedance

high impedance

short transmission line

medium transmission line

long transmission line

medium and long transmission lines

Impedance

Reactance

Either of the above

None of the above

required to operate the circuit breaker

absorbed by the circuit of relay

developed by the relay circuit

none of the above

Inverse time trip

Time-delay trip

Shunt trip

None of the above E. All of the above

to operate the relay of circuit breaker

as a substitute for circuit breaker

always independent of the position of circuit breaker

generally on both sides of a circuit breaker

arc suppressing blow out coils

wide separation of the opened contacts

high speed opening of contacts

all of the above