The protective current relays types RMC-111D, RMC-122D and RMC-132D form part of a complete DEIF series of relays for protection and control of generators. The relays are applicable to both marine and land-based installations. Also available are differential current relays (RMC-131D).
RMC-111D (ANSI codes 50/51) :
This short circuit relay is applied in cases where only protection against short circuit currents is required (I>>).
RMC-122D (ANSI codes 50/51) :
This combined short circuit and over-current relay is applied for protection of generators against both over currents and short circuit currents (I> + I>>).
RMC-132D (ANSI codes 50/51) :
This double over-current relay is applied in cases where protection against over-currents at two levels is required (I> + I>).
The relays measure the highest of the 3-phase currents, providing an RMS measurement at sinusoidal currents. The measurement is based on average values for I>, peak values for I>>. If a current exceeds a set point, theoutput is activated. The set point values are set on the front of the relays by means of potentiometers. If exceeded, a fault signal is generated, and the associated yellow LED is lit.
When the set point is exceeded, its timer starts and will run as long as the fault condition prevails.
If the fault disappears, the timer is reset. When the timer expires, the contact is activated and the associated
red LED is lit.
●LED indication of fault condition
●LED indication for activated relay
Borna Niroo Karan (Bornika) is the exclusive agent of DEIF in the fields of consultation , sales and distribution of power industry products including Short Circuit Relay products .