EGCP-2 Engine Generator Control Package Manual 26086
96 Woodward
Calibration of Generator PTs and CTs
The calibration tuning menu of the EGCP-2 contains calibration points for three
phase generator voltage and current calibration. These calibration points are
labeled as follows:
PT Phase A Scale
Calibrates the A phase generator PT input.
Menus Affected
Changes in the calibration setpoint will change the generator A phase voltage as
read in the Generator Status Menu. 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 which
determines when the generator is in spec as shown in the control overview menu
by a sinusoidal wave under the GEN label. If the generator A phase PT is not
properly calibrated, the level at which the generator is shown as in spec may not
be a true indication of an in spec 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 setpoints
which are found in the Shutdown and Alarm tuning menu. The voltage limit
setpoints 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
which the alarm occurred.
The A phase PT voltage is used in the calculations for KW load, and KVAR load.
All alarms monitoring these conditions will be affected if the A phase PT is not
properly calibrated.
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