Question

The basic operation of distance relay depending on Select one O a Impedance per length b . Current per length OC voltage per length d Resistance per length e frequency reactionance per length​

Answer 1

Answer:

A distance protection relay is a name given to the protection, whose action depends on the distance of the feeding point to the fault.

The time of operation of such protection is a function of the ratio of voltage and current, i.e., impedance.

This impedance between the relay and the fault depends on the electrical distance between them.

Types of distance relays are impedance relays, reactance relays, and the mho relays.

Transmission line

Length & Operating voltage

Distance Relay

Short-line

(0-80) km

(0-20) kV

Reactance relay

Medium line

(80-200) km

(20-100) kV

Impedance relay

Long-line

(>200) km

(>100) kV

Mho relay