Manual 26174 EGCP-2 Engine Generator Control Package
Woodward 147
Calibration of Generator PTs and CTs
The Calibration menu of the EGCP-2 contains calibration adjustments for three
phase generator voltage and current. These calibration adjustments are labeled
as follows:
PT Phase A Scale
Calibrates the A phase generator PT input.
Menus Affected
Changes in the calibration set point will change the generator A phase voltage as
seen on the Generator Status screen. Changing this value will also have an
effect on generator kW and kVAR levels.
The generator A phase voltage is also used as part of the function that
determines when the generator is stable as shown in the System Status menu by
a ++ following the GEN label. If the generator A phase PT is not properly
calibrated, the level at which the generator is shown as stable may not be a true
indication of a stable condition.
Operations Affected
The EGCP-2 uses the A phase generator voltage for voltage matching when
synchronizing across the generator breaker. Accurate calibration of the
Generator A phase PT is critical for proper voltage matching operation.
The sensed generator voltage on the A phase is used in Power Factor/VAR
sharing mode when the EGCP-2 is in parallel with other units on an isolated bus.
The EGCP-2 uses the Voltage Reference as found in the Configuration tuning
menu as a generator voltage reference point when balancing the reactive load on
the bus between generators. If the A phase PT voltage is out of calibration at the
EGCP-2 the bus voltage may be off of this reference when in Power Factor/VAR
sharing mode. Also, poor VAR/PF sharing may occur if the A phase PT is not
properly calibrated.
Generator Voltage is also used in real and reactive load calculations. These
calculations are used in all real and reactive power control functions.
Alarms Affected
The PT Phase A voltage is used for the Voltage High and Low limit set points
that are found in the Shutdown and Alarm tuning menu. The voltage limit set
points can be configured for various alarm indications. Also, if the generator
voltage as sensed by the EGCP-2 exceeds the Voltage High limit, or falls below
the Voltage Low limit, the voltage bias output will stop moving in the direction that
the alarm occurred.
The A phase PT voltage is used in the calculations for kW and kVAR load. All
alarms monitoring these conditions will be affected if the A phase PT is not
properly calibrated.
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