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What is a time delay relay circuit detector?
These relays provide a “Time Delay” between the energizing or de-energizing of the coil and movement of the armature. Such relays are called Time Delay Relays. A Time Delay Relay consists of a normal electromechanical relay along with a control circuit to control the relay operation and timing.
What are the two basic classifications of timers?
Timers can be classified as on-delay or off-delay. Contacts change position for a period of time when an on-delay timer is on.
How long does it take for a relay to complete its operation?
That means the relay will take 3 seconds to complete its operation, with the time setting 1. It is also seen from the curve that, for a lower value of plug setting multiplier, i.e., for a lower value of fault current, the time of operation of the relay is inversely proportional to the fault current.
How is the inverse time delay of a relay achieved?
The inverse-time delay can be achieved by associating mechanical accessories with relays. In an induction relay, the inverse-time delay can be achieved by positioning a permanent magnet (known as a drag magnet) in such a way that relay disc cuts the flux between the poles of the magnet.
How does the time setting multiplier work in a relay?
In time setting multiplier, this total traveling distance is divided and calibrated from 0 to 1 in steps of 0.05. So when the time setting is 0.1, the moving parts of the relay have to travel only 0.1 times of the total traveling distance, to close the contact of the relay.
How does a definite time lag relay work?
Definite Time Lag Relay In this type of relay, there is a definite time elapse between the instant of pickup and the closing of relay contacts. This particular time setting is independent of the amount of current through the relay coil ; being the same for all values of current in excess of the pickup value.