ComAp IG-NT - Page 118

IGS-NT Combi, SW Version 3.0, ©ComAp – May 2013
IGS-NT-Combi-3.0 Reference Guide.PDF
118
This setpoint is used to adjust the nominal mains voltage (phase to phase). This
setpoint is also recalculated automatically when the phase-neutral nominal voltage
MainsNomV is changed.
This setpoint can be used if you know the phase-phase nominal voltage only. The
controller will recalculate the phase-neutral nominal voltage automatically when
this setpoint is changed.
NOTE:
The actual setpoint units and range depend on setting of the Power format in
GenConfig.
NOTE:
If different voltage on gen-set and on Bus/Mains is required the following
procedure is required:
Both setpoints (GenNomVph-ph and MainsNomVph-ph) must be adjusted to the
same values according to the value of actual generator nominal voltage. E.g. gen-
set nominal is 400 V but Bus/Mains nominal is 415 V.
In this case both setpoints need to be adjusted to 400 V and setpoints of
corresponding protections for Bus/Mains need to be set assymetrically.
For 415 V on Bus/Mains it is typical to open MCB when voltage reaches 440 V or
390 V. Since the setpoint is adjusted to 400 V corresponding protection setpoints
need to be adjusted to Mains >V MP = 106% and Mains <V MP = 97 % (hence
the desired values are reached).
Setpoint: FixVoltProtSel
Group
Basic settings
Range [units]
PHASE-NEUTRAL, PHASE-PHASE [-]
Related FW
3.0
Description
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%.
Setpoint: Nominal Freq
Group
Basic Settings
Range [units]
50 Hz, 60 Hz [-]