Question

Difference between impedance relay reactance relay and mho relay

Answer 1

impedance is non-directional and used in medium transmission lines. reactance relay is non directional and used in short transmission lines. mho relay is directional and used in long transmission lines.

Answer 2

Impedance relay:

Impedance Relay is safety relay which functions depending upon the distance of liability in the line.  

Reactance relay:

A reactance relay is an over-current relay with steering restraint. The directional element is organized to develop maximum negative torque when its current lags its voltage by 90.

Mho Relay:

A mho Relay is a high-speed relay and is also recognized as the admittance relay. In this relay operating torque is gained by the volt-amperes element and the controlling element is settled due to the voltage element.

Hope it helped.....