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