Definite-distance Type Impedance Relay
Definite-distance Type Impedance Relay Fig shows the schematic arrangement of a definite-distance type impedance relay. It consists of a pivoted beam F and two electromagnets...
Category : Power System
Distance or Impedance Relay
The group of relays in which the operation is governed by the ratio of applied voltage to current in the protected circuit. Such relays are...
Induction Type Directional Overcurrent Relay
Induction Type Directional Overcurrent Relay The directional power relay discussed is unsuitable for use as a directional protective relay under short-circuit conditions. When a short-circuit...
Induction Type Directional Power Relay
Induction Type Directional Power Relay This type of relay operates when power in the circuit flows in a specific direction. Unlike a nondirectional overcurrent relay,...
Induction Type Overcurrent Relay,Non Directional Relay
Induction Type Overcurrent Relay It is also known as Non Directional Relay.This type of relay works on the induction principle and initiates corrective measures when...
Calculation of Relay Operating Time
In order to calculate the actual relay operating time, the following things must be known : (a) Time/P.S.M. curve (b) Current setting (c) Time setting...
Definition of Pick-up current, Current setting, Plug-setting multiplier and Time-setting multiplier
(i) Pick-up current. It is the minimum current in the relay coil at which the relay starts to operate. So long as the current in...
Time vs. plug setting multiplier Curve of a typical Relay
Figure shows the curve between time of operation and plug setting multiplier of a typical relay. The horizontal scale is marked in terms of plug-setting...
brief note on relay timing: controlling the operating time of a relay.
An important characteristic of a relay is its time of operation. By ‘the time of operation’ is meant length of the time from the instant...
Equation for torque developed in an induction relay: Working principle of Induction Relay and their types
Electromagnetic induction relays operate on the principle of induction motor and are widely used for protective relaying purposes involving a.c. quantities. They are not used...
