Asian Under + Over voltage relay find application in effective protection
of equipments such as genet, motors, pumps, trans, Shunt capacitors
etc. from damage due to transient under voltages. These are also used
to sense blackouts and brownouts and to control auto start stops of
engines and genets e.g. In AMF panel. The input voltage is continuously
checked and the value measured is compared against a preset generates
a changeover signal. Two sets of potential free changeover contacts are
provided for breaker tripping. The relay resets automatically when the
input is within limits. A fixed time delay of 2-4 sec on low and high signal
is also given after comparison to suppress false tripping as in case of
transients. Under and over voltage are externally suitable on front facia by
two potentiometers. A hysteresis of about 5-15.
Volts between dropout and pickup is provided to avoid sharp cutoffs.
The relay remains off when is low or zero or high than set limit and
when voltage is healthy the relay is on. (This care of no volt operation)
LED indicator Display the status.