Basler DECS-200 User Manual

3-14 Functional Description DECS-200
DROOP AND LINE-DROP COMPENSATION
Droop and line-drop compensation are accomplished through the load compensation equation:
()
TCCTC
IjXRVV ++=
1
Where:
1C
V
is the compensated output voltage
T
V
is the measured terminal-voltage vector
()
Cc
jXR +
are the compensation impedance values
T
I
is the measured terminal-current vector
When the droop percentage is a positive quantity, reactive droop compensation is performed. Droop is
the product of the output voltage and the kvar that the generator is exporting. This is equivalent to the
above compensation equation with R
C
equal to zero and neglecting the real part of the vector,
T
I
.
When the droop percentage is a negative quantity, line-drop compensation (LDC) is preformed. LDC
takes into account the real part of the vector,
T
I
. Since LDC is typically used to compensate for reactive
impedance losses in transformers, R
C
is assumed to be zero. For LDC, the above equation becomes:
()
TCTC
IjXVV +=
1
DATA LOGGING AND REPORTING
DECS-200 data logging and reporting features include a sequence of events recorder that records up to
eight oscillography records.
Sequence of Events Reporting
A sequence of events recorder monitors the internal and external status of the DECS-200. Events are
scanned at 50 millisecond intervals with 127 events stored per record. All changes of state that occur
during each scan are time tagged. Sequence of events reports are available through BESTCOMS. All
monitored events are listed below.
System Contact Input State Changes
• Alarm reset
• AVR mode enable
• FCR mode enable
• Pre-Position
• Secondary enable
• Start
• Stop
• Unit/Parallel (52 L/M)∗
• VAR/PF enable (52 J/K)∗
∗ The 52 contacts are reported as disabled when the input is jumpered to common and reported as
enabled when the input is not jumpered. All other contacts are reported as enabled when the inputs
are jumpered to common.
System Output State Changes
• On/Off relay output
• Relay 1 output
• Relay 2 output
• Relay 3 output
• Watchdog relay output
System Alarm State Changes
• Exciter diode open
• Exciter diode shorted
• Field overcurrent
• Field overvoltage
• Generator overvoltage
• Generator undervoltage
• Loss of field
• Lost voltage sensing
• Overexcitation limit
• Stator current limit
• Underexcitation limit
• Underfrequency
Changes in State of System Status
• Auto tracking mode
• Control mode
• Limiter mode
• Load compensation mode
• Operating mode
• Soft-start mode
• Stop/Start
• Underfrequency mode
• Voltage matching mode

Basler DECS-200 Specifications

General

Brand	Basler
Model	DECS-200
Category	Controller
Language	English