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What is defrential protection relay?
I am going to assume that you are asking about a differential relay. It is basically just that- it compare two different sources and will trip at a set value value of the difference. These can be directional as well. A couple of examples are transformer protective relays and bus differential. A transformer relay will measure the amount of current coming into the transformer and the amount of current going out. If there is a disparity due to an internal fault the relay will trip the supply source and deenergize the transformer. Same for the Bus differential.
What is differential relay?
when the cable of a motor shorted then differetial relay act
Which relay is used to protect generators and motors?
differential protection relay
What is the definition of differential relay and how does it function?
In power transformer, a differential relay is a relay that verifies the balance of current between the primary and the secondary face of a transformer. It is also employed in other components of the power system like in protecting cables. Differential relay is also called a unit protection.
What is motor differential relay?
when the cable of a motor shorted then differetial relay act
Dear all what direct consequences can be from Current transformer on generator with respect to differential protection relay?
CT's are used as inputs to the differential. If the CT is bad, or it is not wired to the differential correctly, it will cause differential current to be seen by the relay, resulting in a trip.
Why percentage differential relays do not normally need to be coordinated with the action of any other relay?
Differential relays should only operate for faults within the zone of protection, so there is no coordination issue. The reason to coordinate relays is for backup protection (a relay at a remote substation sees faults that should be cleared by another relay, for example). A differential will not see this fault, since it is external to it's zone of protection.
What are the Application of electromagnetic relay?
1) protection of various ac and dc components 2)it can be used for differential protection 3)used as auxiliary relays in contact systems of protective relaying schemes
Internal circuit of an electrical relay?
basic circuit of electrical protective relay
What is reset ratio of protective relay?
kutria
What is the difference between diffrencial relay and a distance relay?
They're completely different, used for different applications (usually). A distance relay uses both current and voltage. A differential relay uses only current. A differential relay usually has harmonic restraint capability, while distance relays ideally track system frequency. Differential relays require fast operation, while distance relays may not be required to operate as quickly. Distance relays have more issues with operating for out of zone problems than differential relays. There are many more, but this gives an idea.
What is percentage bias relay?
This is basically a differential relay that contains an additional restraining coil with the operating coil connected at its midpoint used to prevent the unnecessary pick up of the relay.
