October 30th, 2008
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Electromagnetic attraction relays operate by virtue of an armature being attracted to the poles of an electromagnet or a plunger being drawn into a solenoid. Such relays may be actuated by d.c. or a.c quantities. The important types of electromagnetic attraction relays are: (i) Attracted armature type relay – Fig 3 shows the schematic arrangement [...]
Written by John on October 30th, 2008 with 1 comment.
Read more articles on classification of relays and Power System and Relays and Switchgear&Protection.
The relays used in the power system operate by virtue of the current or voltage supplied by the current and voltage transformers connected in various combinations to the system element that is to be protected. Through the individual or relative changes in these two quantities, faults signal their presence, type and location to the protective [...]
Written by John on October 30th, 2008 with 2 comments.
Read more articles on classification of relays and Power System and Relays and Switchgear&Protection.
The principle function of protective relaying is to cause the prompt removal from service of any element of the power system when it starts to operate in an abnormal manner or interfere with the effective operation of the rest of the system. In order that protective relay system may perform this function satisfactorily, it should [...]
Written by John on October 30th, 2008 with no comments.
Read more articles on Power System and Relays and requirement of protective relaying and Switchgear&Protection.
When failure occurs on any part of the system it must be quickly detected and disconnected from the system for two reasons. Firstly if fault is not cleared it may cause unnecessary interruption of service to the customers. Secondly the rapid disconnection prevents the damage and spreading of fault into the system. The detection of [...]
Written by John on October 30th, 2008 with no comments.
Read more articles on Power System and Relays and Switchgear&Protection.
TYPES OF PROTECTION When fault occurs in any part of system, it must be cleared quickly to avoid damage or interference with rest of the system. Protection scheme is divided into two classes- primary protection and back up protection. Primary protection It’s used for protection of component parts of power system. In fig 1 each [...]
Written by John on October 30th, 2008 with no comments.
Read more articles on Power System and Relays and Switchgear&Protection and Types of relay protection.
