Section 75 00-02-0878
2013-03-07 - 108 -
The table shows the actual measurements at a 10% under voltage situation in a
400/230 volt system.
The alarm will occur at two different voltage levels, even though the alarm setpoint is
10% in both cases.
Example
The below 400V AC system shows that the phase-neutral voltage must change 20%,
when the phase-phase voltage changes 40 volts (10%).
NOTE: Phase-neutral or phase-phase: both the generator
protections and the busbar/mains protections use the selected
voltage.
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