Phase Sequence Relay Working Principle

Induction relay torque equation.

Phase sequence relay working principle.

Working principle of relay. In induction relay torque equation two magnetic fluxes φ1 and φ2 differing in time phase penetrate through a disc. A relay which protects the electrical system from negative sequence component is called a negative sequence relay or unbalance phase relay. What is a phase sequence meter or indicator and its working principle.

The negative sequence relay protects the generator and motor from the unbalanced load which mainly occurs because of the phase to phase faults. Ansi code for negative sequence relay. Phase sequence indicators can be classified into two types. 51 2 negative sequence time overcurrent relay acted.

These alternating fluxes induce emfs e1 and e2 in the disc which lag their respective fluxes by 90. The first stage tripping is given to the grid circuit breaker as the grid is infinite loads the second stage of tripping will be given to the generator circuit breaker. Types of phase sequence indicators. It works on the principle of an electromagnetic attraction.

The small power relay has only. This magnetic field moves the relay armature for opening or closing the connections. Working principle of relay. The phase sequence meter is used for the detection of phase sequence in three phase circuits and there are different types of phase sequence indicators that are as follows.

When the circuit of the relay senses the fault current it energises the electromagnetic field which produces the temporary magnetic field.