Overvoltage unit

When the voltage values exceed the set start value of low-set stage U>,  the overvoltage

unit will start to deliver a start signal after a ~60 ms’ start time. When the set operate time

at definite-time characteristic or the calculated operate time at inverse definite mini

mum time (IDMT) characteristic elapses, the overvoltage unit will deliver a trip signal.

When the voltage values exceed the set start value of high-set stage U>>, the overvoltage

unit will start to deliver a start signal after a ~50 ms’ start time. When the set operate time

at definite-time characteristic or the calculated operate time at IDMT characteristic

elapses, the overvoltage unit will deliver a trip signal.

The low-set and the high-set stage of the overvoltage unit can be given either a defi

nite-time or an IDMT characteristic. At IDMT characteristic, two time/voltage curve

groups, A and B, are available.

It is possible to block the tripping of an over voltage stage by applying an external binary

input signal to the relay.

The high-set stage can be set out of operation. This state will be indicated by dashes on the

LCD and by “999” when the set start value is read via serial communication.