14
4
Configurable Protection Shutdowns
All configurable protection features have a user-
defined threshold and timer value. If the threshold
condition for a particular protection feature is met,
an alarm is triggered. The DVR
®
displays an alarm
signal on the HMI and in DVRPortal™. An indepen-
dent timer starts at the moment the alarm condition
is triggered.
If the timer threshold is exceeded before the alarm
condition is removed, a fault is then triggered and
the excitation current to the field is shutdown. A fault
signal is displayed on the HMI and in DVRPortal™.
Table 4-1 shows the details of the timer-based pro-
tection features in the DVR
®
.
Field Over Excitation Shutdown
The Field Over Excitation protection feature is
triggered if field current exceeds the threshold. The
fault is triggered if field current doesn’t fall below
90% of the threshold within the timer period.
Field Under Excitation Shutdown
The Field Under Excitation protection feature is
triggered if the absorbed VAR’s exceed the
threshold. The fault is triggered if the absorbed
VAR’s do not fall below the threshold within the timer
period.
Generator Over Voltage Shutdown
The Generator Over Voltage protection feature is
triggered if generator voltage exceeds the threshold.
The fault is triggered if generator voltage does not
fall below the threshold within the timer period.
Generator Under Voltage Shutdown
The Generator Under Voltage protection feature
is triggered if generator voltage drops below the
threshold. The fault is triggered if generator voltage
stays below the threshold for the duration of the
timer.
Generator Voltage Imbalance Shutdown
The Generator Voltage Imbalance protection feature
is triggered if a voltage imbalance is detected in
AVR3, VAR or PF regulation modes, imbalance differ-
ence between any single phase and the average of
the three phases of more than the threshold is inter-
preted as a voltage imbalance. The fault is triggered
if the voltage imbalance condition continues for the
duration of the timer.
In AVR1 and FCR regulation modes, generator
voltage imbalance protection is disabled.
Generator Reverse Power Shutdown
The Generator Reverse Power protection feature is
triggered if generator reverse power exceeds the
threshold. The fault is triggered if generator reverse
power stays above the threshold for the duration of
the timer.
Non-Configurable Protection Shutdowns
Non-configurable protection features have factory-
defined settings for thresholds and timers, if appli-
cable. Each shutdown feature below describes the
details of the conditions for the shutdown event to
occur.
Loss of Generator Sensing Shutdown
The Loss of Generator Sensing protection feature is
triggered if sensing input continuity is lost. There is
no alarm for this condition – the fault and shutdown
is triggered shortly after the condition is met.
Note: In AVR1, AVR3, VAR and PF regulation modes,
Loss of Sensing is not enabled until a speed of 850
RPM is detected.
Instantaneous Field Over Current Shutdown
The Instantaneous Field Over Current protection fea-
ture triggers a fault if generator field current exceeds
11 Adc. There is no alarm for this condition – the fault
and shutdown is triggered shortly after the condition
is met.
Regulator Over Temperature Shutdown
The Regulator Over Temperature protection feature
is triggered if the internal regulator temperature
exceeds a factory default alarm threshold. A fault is
triggered if the regulator temperature exceeds a fac-
tory default shutdown threshold.
Features and Protection
GPN046 04-13.indd 14 4/5/13 10:24 AM
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