IGS-NT-BC, SW Version 1.2.0, ©ComAp – January 2019
IGS-NT-BC-1.2.0 Reference Guide.PDF
PHASE-NEUTRAL: The generator and mains/bus voltage protections are based
on phase-neutral voltages and the phase-neutral nominal voltages are taken as
100%.
PHASE-PHASE: The generator and mains/bus voltage protections are based on
phase-phase voltages and the phase-phase nominal voltages are taken as 100%.
NOTE:
Both options require different settings of protection levels to achieve identical
results.
EXAMPLE:
Phase-nominal voltage is 231V, actual voltages are L1N = 231V, L2N = 231V,
L3N = 219.5V => the L3N voltage is at 95% of the nominal. The same situation
evaluated from phase-phase voltages gives following results: nominal phase-
phase voltage is 400V, measured voltages are L12 = 400V, L23 = 390V, L31 =
390V => the L23 and L31 are at 97.5% of the nominal. It is obvious that if the
situation is evaluated from phase-neutral voltages the tripping level must be
adjusted to 95%, whereas the same situation evaluated from phase-phase
voltages require tripping level adjusted to 97.5%.
The setpoint adjusts nominal system frequency.
frequency.
The value Nominal Freq is used as 100% for generator and mains/bus frequency
protections and as requested value for frequency regulation (except
synchronizing) if the setpoint Freq reg loop is set to ALL THE TIME.
OFF, MAN, SEM, AUT, TEST [-]
This setpoint can be used to select the controller mode. It is equivalent to
selecting the mode by the buttons on the front panel. Currently active mode is
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