Section 75 00-02-0878
2013-03-07 - 107 -
Protections
General
The protections are all of the definite time type, meaning, a setpoint and time is
selected.
If the function is, for example, Overvoltage, the timer will be activated if the setpoint is
exceeded. If the voltage value falls below the setpoint value before the timer runs out,
then the timer will be stopped and reset.
When the timer runs out, the output is activated. The total delay will be the delay setting
+ the reaction time.
Phase-Neutral Voltage Trip
If the voltage alarms are to work based on phase-neutral measurements, please adjust
parameters 1200 and ph–ph or ph–N accordingly. Depending on the selections, either
phase-phase voltages or phase-neutral voltages will be used for the alarm monitoring.
As indicated in the vector diagram, there is a difference in voltage values at an error
situation for the phase-neutral voltage and the phase-phase voltage.
To Next Page
Loading...
