Arcteq Generator Commander, Instruction Manual

Page: 443 / 561

Name Range Step Default Comments
Q-axis
coordinate at
P=0.40 p.u.
-1.00...1.00 0.01 -0.20
Q-axis
coordinate at
P=0.60 p.u.
-1.00...1.00 0.01 -0.15
Q-axis
coordinate at
P=0.80 p.u.
-1.00...1.00 0.01 -0.10
Q-axis
coordinate at
P=1.00 p.u.
-1.00...1.00 0.01 -0.05
Stator current limiter
The stator current limiter (SCL) limits the stator current of the generator. It operates by decreasing
excitation when the stator current reaches the maximum capacity of an overexcited synchronous
machine. If the machine is underexcited, the SCL increases excitation. This limiter reduces the current
to avoid the stator winding overheating and its inverse time delay allows for a short time overload
during grid disturbances. If the active power is high, the stator current cannot be lowered by changing
the excitation. In such a case an alarm signal is issued.
The diagram below depicts the transfer function of the stator current limiter.
Figure. 6.2.1.4.2 - 220. SCL transfer function.
Table. 6.2.1.4.2 - 362. SCL setting parameters.
Name Range Step Default Comment
Stator current
limiter (SCL) status
0: Enabled
1: Blocked
2: Overexcitation limit
active
3: Underexcitation limit
active
4: Active (IP) overcurrent
ON
- -
Displays the status of the stator current
limiter.
SCL output now -500.00…500.00p.u./p.u. 0.01p.u./p.u. 0.00p.u./p.u.
Defines the output of the SCL at the
moment.
Stator current
limiter
0: Disabled
1: Enabled
- 1: Enabled
Enables and disables the stator current
limiter.
Genera Generattor Commander or Commander
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
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