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Directional Relays

Directional Relays: Selective protection cannot be achieved with time graded overcurrent protection systems in ring or loop systems as well as in radial circuits with two end power supply. A…

Directional Overcurrent Relays in Power Systems

Directional Overcurrent Relays in Power Systems: Directional Overcurrent Relays in Power Systems - Relay connections must be made so that the currents and voltages applied to the relay during the…

Directional Static Overcurrent Relay

Directional Static Overcurrent Relay: For obvious reasons of obtaining selectivity overcurrent relays are made directional. Directional static overcurrent relay senses direction of power flow by means of phase angle between…

Classification of Relays

Classification of Relays: The protective relay may be defined as an electrical device interposed between the main circuit and the circuit breaker in such a manner that any abnormality in…

Static Relays Interview Questions and Answers

Static Relays Interview Questions and Answers: 1. What is static relay ? Ans. A static relay refers to a relay in which there is no armature or other moving element…

Protective Relays Interview Questions and Answers

Protective Relays Interview Questions and Answers: 1. What is a protective relay ? Ans. Protective relay is an electrical device designed to initiate isolation of a part of an electrical…

Basic Static Relays in Protective System Articles

Basic Static Relays in Protective System Articles: Basic Elements of Static Relay : The basic elements of a static relay are namely, Input Element: Mixing circuits are needed to sum…

Basic Components of Static Relays Articles

Basic Components of Static Relays Articles: Field Effect Transistor in Static Relay : Field Effect Transistor in Static Relay is a unipolar device as compared to bipolar transistor already discussed.…

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