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Advantages and Disadvantages of Electromagnetic Relay

Advantages and Disadvantages of Electromagnetic Relay


There are many Advantages, Disadvantages and Application of Electromagnetic Relay which will be mentioned in this article


Advantages, Disadvantages and Application of Electromagnetic Relay
Advantages and Disadvantages of Electromagnetic Relay


Advantages Of Electromagnetic Relay



✓ Electromagnetic relays have fast operation and fast reset.


✓ They can be used for both a.c.and d.c.systems for protection of a.c.and d.c.
equipments.


✓ Electromagnetic relays operating speeds which has the ability to operate in milliseconds
are also can be possible.


✓ They have the properties such as simple, robust, compact and most reliable.


✓ These relays are almost instantaneous. Though instantaneous the operating time of the relay varies with the current. With extra arrangements like dashpot, copper rings etc.


✓ slow operating times and reset can be possible.


Disadvantages Of Electromagnetic Relay



✓ High burden level instrument transformers are required such that CTs and PTs of high burden is required for operating the electromagnetic relays compared to static relays.


✓ The directional feature is absent in electromagnetic relays.


✓ Requires periodic maintenance and testing unlike static relays.


✓ Relay operation can be affected due to ageing of the components and dust,pollution
resulting in spurious trips.


✓ Operation speed for an electromagnetic relays is limited by the mechanical inertia
component.



Applications Of Electromagnetic Relay:



✓ Electromagnetic relays are employed for the protection of various a.c.and d.c.
equipments.


✓ The over or under current and voltage protection of various a.c.and d.c.equipments.


✓ For differential protection.


✓ Used as auxiliary relays in the contact systems of protective relays schemes.


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