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To avoid the motoring of the generator, a reverse power trip is installed. It is basically a relay made up of a lightweight non-magnetic Aluminium disc between two soft laminated electromagnetic iron cores.
Reverse Power Relay is a directional protective relay that prevents/protect the generator from motoring effect (going to reverse direction). It is used where generator runs in parallel with other utility or generator.
A reverse power relay helps in monitoring the power in the generator, it detects a reverse power condition, and the relay immediately removes the connection to the parallel utility or other power source, hence protecting the generator from damage.
There are two very important safety system on our Main Switchboard and these are the Preferrential trip and Revere Power Trip.here is the step by step guide ...
In this article, know about two methods used for alternator or generator protection on ships in case of reverse power as well as under voltage. See how the alternator is protected in such circumstances.
Reverse Power Relay >Reverse power relay monitors the direction of power flowing between generator and the load. >Reverse power relay detects the reverse power flow and trips the generator circuit breaker.
The Reverse Power Trip Relay is a crucial protective device used in electrical systems, particularly for generators. It operates based on the principles of Faraday’s law of induction and Lenz’s law.
When power reverses, the disc rotates in the other direction, away from the stop, and the contacts are closed so that the breaker trip circuit is energized. A time delay of 5 sec prevents reverse power tripping due to surges at synchronizing.
reverse power trip under voltage trip The over current protection works by removing power supplies to non essential services on a preferential basis. This is done with the help of preferential trips which decides the load that is to be removed in case of overloading of the distribution system.
You will now see how the reverse power protection is provided using reverse power relay. Consider that both the generators are now running with 200 kilowatt loads on each one of them. if a prime mover of no.1 generators fail, the voltage and load drops on that generator.