0
My understanding is that on most (if not all) differential relays, there are currents coming in from both sides of the operating coil. These currents should cancel out, or in reality, nearly cancel out. Therefore, the effective current in the operating coil is zero. When the net current in the operating coil is not zero, the relay trips.
There are instances when you don't want the relay to trip though. Therefore, the operating coil works together with a restraint coil. (Well probably 2 restraint coils.) The relay will trip if the operating coil's current must exceed the restraint coil's current by a certain amount.
Wiki User
∙ 10y ago
Add your answer:
Earn +20 pts
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.
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.
Which relay is used to protect generators and motors?
differential protection relay
What is differential relay?
when the cable of a motor shorted then differetial relay act
What is transistor relay driver?
a transistor circuit for driving the coil of a magnetic relay.
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.
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.
Where is coil relay on 1986 ford eco van?
There is no such thing as a coil relay.
What is a relay coil?
Most relays have an internal electromagnetic coil that is energized when the relay is activated.
What is a control relay coil?
Most relays have an internal electromagnetic coil that is energized when the relay is activated.
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.
What could cause a relay coil resistance to be lower than specification?
A short within the relay coil itself.
Where you can see differential protective relay?
Power Transformer
