Directional Relays

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…

Continue Reading Directional Relays
Directional Static Overcurrent Relay

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…

Continue Reading Directional Static Overcurrent Relay
Classification of Relays

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…

Continue Reading Classification of Relays

Basic Components of Static Relays Articles

Basic Components of Static Relays Articles Semiconductor Diodes in Static Relays: The pn junction has rectifying characteristics as shown in Fig. (10.1). If a source of emf is connected to…

Continue Reading Basic Components of Static Relays Articles
Distance Protection by Reactance Relays

Distance Protection by Reactance Relays

Distance Protection by Reactance Relays: Like impedance relays, Distance Protection by Reactance Relays are also amplitude comparators and thus require an additional directional unit. Although the performance of reactance relays…

Continue Reading Distance Protection by Reactance Relays