Name
Range
Step
Default
Comment
Limiter calculation
mode
0: Raw Iq value
1: ABS (Iq) value
-
1: ABS (Iq)
value
Selects the limiter calculation mode.
Proportional gain
KpSCL (field
voltage/stator
current)
0.000…10.000p.u./p.u.
0.001p.u./p.u. 1.000p.u./p.u. Defines the proportional gain for the SCL.
Integral gain KiSCL
0.000…1.000 1/s
0.001 1/s
0.100 1/s
Defines the integral gain for the SCL.
Stator current limit
0.100…2.000p.u.
0.001p.u.
1.100p.u.
Defines the limit point for the stator
current at which the SCL is activated.
Time delay to alarm
for high active
current component
1.000…1800.000s
1.000s
10.000s
Defines the time delay for the limiter
activity, after which the limiter issues an
alarm.
Reactive current
treshold
0.000…1.000p.u.
0.001p.u.
0.100p.u.
Defines the reactive current that the SCL
keeps, in spite of the threshold being
exceeded.
Maximum
modulation of AVR
setpoint
0.000…1.000p.u.
0.001p.u.
0.200p.u.
Defines the maximum modulation that the
SCL can have on the AVR reference value.
SCL inverse time
delay (0 = instant)
-1.000…0.000p.u.
0.001p.u.
-0.100p.u.
Defines the inverse time delay for the SCL.
Therefore, the bigger the set value, the
faster the limiter takes effect.
Field current limiter
The fiel current limiter (FCL) has two steps, one instantaneous and one time-delayed.
The instantaneous field current limiter (IFCL) is used when the excitation system is designed with a
high ceiling voltage without requiring a high field forcing current. The purpose of the IFCL is to mainly
prevent the overheating of the power rectifier that has a small thermal time constant; however, it also
keeps the rest of the field circuit protected.
The diagram below depicts the transfer function of the instantaneous field current limiter.
Figure. 6.2.1.4.3 - 221. IFCL transfer function.
The delayed field current limiter (DFCL) has a lower setting typically corresponding to the rated
generator load. It has an inverse time delay to allow for field forcing during grid disturbances. It is used
to prevent the various components in the field circuit (such as the generator field coils, power rectifier,
excitation transformer, cables) from overheating. In order to contribute to the stabilization of the power
grid during voltage disturbances, the limiter is time-delayed to allow it to overload for a short time.
The diagram below depicts the transfer function of the delayed field current limiter.
Genera
Generattor Commander
or Commander
Instruction manual
Version: 2.07
442
© Arcteq Relays Ltd
IM00001
Содержание Generator Commander
Страница 1: ...Generator Commander Instruction manual...
Страница 2: ......