Manual 37365A GCP-30 Series Packages - Genset Control
© Woodward Page 107/179
Parameter 188
Mains undervolt.
Hysteresis 00.0%
Mains undervoltage hysteresis 0.0 to 50.0 %
The value configured here is the amount the monitored voltage must exceed the
configured threshold in Parameter 187 before the corresponding relay output will
de-energi
ze.
Parameter 189
Mains undervolt.
delay 0.00s
Mains undervoltage delay 0.02 to 9.98 s
For the control unit to recognize that a mains undervoltage fault has occurred, the
threshold value configured in Parameter 187 must be exceeded without interruption
for t
his period of time.
Phase/Vector Shift Monitoring dϕ/dt
A phase/vector shift is a sudden change in the voltage curve that is caused by a large generator load change. The
measuring circuit detects a change in a single sine wave. This sine wave is compared with a calculated mean val-
ue from previous measurements. Monitoring encompasses all three phases. The threshold value in degrees speci-
fies the difference in time between the mean and the measured value in reference to a full cycle. Monitoring can
be set in various manners. The phase/vector shift watchdog may be used as an additional means for decoupling
from the mains. The minimum voltage that the phase shift is activated is 70 % of the rated secondary voltage.
Function: "Voltage cycle duration not within the permissible limits" - A fault is recognized if one or more phas-
es of the generator voltage cycle duration exceeds the configured limit value for the phase/vector shift. The cir-
cuit breaker configured to disconnect from the mains is opened and an alarm message is displayed. The prerequi-
site for phase/vector shift monitoring is that the generator is operating in parallel with the mains operation (the
MCB and GCB are both closed).
Parameter 190
Phase shift
monitoring ON
Phase/vector shift monitoring ON/OFF
ON ................ Monitoring of the mains frequency for a phase/vector shift is
enabled. The subsequent screens of this function are displayed.
OFF .............. Monitoring of the mains frequency for a phase/vector shift is dis-
abled. The subsequent screens of this function are not displayed.
Parameter 191
Monitoring
----------------
Phase/vector shift monitoring one-/threephase / only threephase
one-/threephase..During single-phase voltage phase/vector shift monitoring, trip-
ping occurs if the phase/vector shift exceeds the configured threshold
value (Parameter 192) in at least
one of the three phases. Note: If a
phase/vector shift occurs in one or two phases, the single-phase thre-
shold value (Parameter 192) is taken into consideration; if a
p
hase/vector shift occurs in all three phases, the three-phase thre-
shold value (Parameter 193) is taken into consideration. Single phase
m
onitoring is very sensitive and may lead to nuisance tripping if the
selected phase angle settings are too small.
only threephase..During three-phase voltage phase/vector shift monitoring, trip-
ping occurs only if the phase/vector shift exceeds the specified thres-
hold value (Parameter 193) in all three phases within 2 cycles.
Issuing of F0 class alarm
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