The Critical Role of Protection Relays |
Posted: March 31, 2020 |
A protective relay primarily operates as a sensing device - it identifies a fault, then locates its position, and finally, issues or administers the tripping command to the circuit breaker. The circuit breaker after receiving the command from the protective relay then goes on to disconnect the malfunctioning element. By effectively dealing with the fault in a swift manner - with the help of fast-acting protection relay and correlated circuit breaker, the damage to the apparatus can be reduced to a significant extent. The potential adverse effects of hazards like fire and electrical damage which can even cause human injury are close to zero when the faulty element is dealt with. With the aid of a protection relay, the consistency of supply is maintained, by efficiently dealing with the fault quick enough. This leads to the fault arising time also reducing, and therefore the system can be restored to its normal state sooner rather than later. With the help of a protection replay, the chances of developing different types of faults such as a single phase-to-ground or even a more severe fault such as double phase-to-ground fault are greatly reduced. The fault may not be dealt with properly if the circuit breaker fails to open or for some reason if the protection relay itself malfunctions in some way or the other. The protection relay failure ca rise due to any of these three distinct possibilities -
In such cases, like the ones mentioned above, the second line of defence of security is offered by the backup relays. The backup relay has a longer operating time, even though they correctly identify the fault along with the primary relays. The protection relay is an example of a primary relay. The working of the protection or electric relays either operates on one of these two working principles - electromagnetic attraction or electromagnetic induction. The electromagnetic attraction type relay consists of a solenoid which is pulled towards the poles of the electromagnet. This relays function on both the AC and DC supply.
To attain the desired reliability, the power system network is divided into a variety of different protection zones -
It should be noted that protective relays do not remove the chances of any defaults in a power system, but instead deal with the default once it has occurred. The primary characteristics of a good protective relaying are its reliability, sensitivity, simplicity, speed, and economy. #SchneiderElectric is a big brand which can be relied on in the sphere of protection relays, along with other appliances in the domain of surge protection, motor protection, and surge arresters #LifeIsOn
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