Manual 37365A GCP-30 Series Packages - Genset Control
© Woodward Page 27/179
NOTE
If a three-wire system is connected, terminal 0 must remain disconnected. If terminal 0 is connected,
the control may monitor a voltage that exceeds the permissible limits.
Generator Current
Parameter 19
Current transf.
generator 0000/x
Generator CTs 10 to 7,000/{x} A
The input of the current transformer ratio is necessary for the indication and control
of the actual monitored value. The current transformers ratio should be selected so
at least 60% of the secondary current rating can be measured when the monitored
system is at 100% of operating capacity (i.e. at 100% of system capacity a 5A CT
should output 3A). If the current transformers are sized so that the percentage of
the output is lower, the loss of resolution may cause inaccuracies in the monitoring
and control functions and may affect the functionality of the control.
The control may be ordered with either ../1 A or ../5 A current transformer inputs.
The CT inputs will dictate how this parameter is displayed on the control. Informa-
tion about the current transformers inputs may be found on the unit data plate.
{x} = 1 A ...... GCP30x1B/xxx = Current transformer inputs rated for ../1 A
{x} = 5 A ...... GCP30x5B/xxx = Current transformer inputs rated for ../5 A
Parameter 20
Power measuring
gen.------------
Generator power measurement singlephase / threephase
This controller may be configured to measure generator power single-phase or
three-phase. If "single-phase power measurement" is selected, only the voltage and
current from L1 phase will be used to calculate power. If "three-phase power mea-
surement" is selected, the voltage and current from all three phases will be used to
calculate power.
• single-phase power measurement: P = √3 × V
L12
× I
L1
× power factor
• three-phase power measurement:
P = (V
L1N
× I
L1
× power factor) + (V
L2N
× I
L2
× power factor) + (V
L3N
× I
L3
×
power factor).
NOTE
When the generator is supplying positive real power to a load, the current should flow from the genera-
tor to the load through the CT in the "S1 to S2" direction. When positive real power is being supplied,
the inductive reactive (lagging) power flows in the same direction through the CT. If the S1 termin-
al/polarity dot is facing the generator and the s1 terminal of the CT is connected to the s1 terminal of
the GCP-30, the control will display that positive real power is being supplied. If a CT is installed back-
wards, that phase will display negative real power for that phase.
Parameter 21
Rated power
generator 0000kW
Generator rated power 5 to 9,999 kW
The generator rated power is configured here. It is crucial to ensure that the correct
generator power rating is entered. Multiple measuring, control, and protective func-
tions refer to the value configured in this parameter (i.e. the percentage configured
for generator overload).
Parameter 22
Rated current
generator 0000A
Generator rated current 10 to 7,000 A
The generator rated current is configured here. The percentages configured for the
protective function refer to the value input in this parameter.
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