Arcteq Generator Commander, Instruction Manual

Page: 472 / 561

Event block
name
Event
code
Event name Description
GMAG2 43
MVar mode
OFF
The MVar mode is OFF.
GMAG2 44 PF mode ON The PF mode is ON.
GMAG2 45 PF mode OFF The PF mode is OFF.
GMAG2 46
PSS enabled
ON
The power system stabilizer is ON.
GMAG2 47
PSS enabled
OFF
The power system stabilizer is OFF.
GMAG2 48
PSS blocked
ON
The power system stabilizer blocking is ON.
GMAG2 49
PSS blocked
OFF
The power system stabilizer blocking is OFF.
6.2.6 Other control functions
6.2.6.1 Reference values
The reference value of the active control mode can be adjusted in two ways: locally through the
device's HMI panel, and remotely through a bus interface or with increase and decrease signals. When
a control mode is not in operation, it is always in the follow-up mode to avoid bumps when it is
activated.
6.2.6.2 Start and stop functions
When the generator starts, the governor system increases the speed. When the generator is at 90 % of
its maximum speed, the field breaker is closed and the reference value begins to rise to a pre-set level
according to a soft-start ramp. If the grid voltage can be measured, the level follows the grid voltage
and thus makes the generator's synchronization easier.
During a normal stop of the generator, the command "Unload reactive powers" can be sent to the IED.
This drops the reactive power to zero and issues a status signal. When the command "Open field
breaker" is sent to the IED, the excitation is forced to zero for one second before the field breaker is
opened. This allows the saving of the field breaker's lifetime.
During an emergency trip a hardwired trip command is sent directly to the field breaker.
6.2.6.3 Test mode
An open loop controller can be activated for testing and commissioning purposes. The activation and
closing of the field breaker does not cause excitation, keeping it at zero. The excitation is then adjusted
with the increase and decrease commands.
6.2.6.4 Test functions
When the test function is activated, either locally or remotely, an open loop controller is activated. The
output of the power rectifier can be controlled by "Increase" and "Decrease" commands. The other
control loops goes into a follow-up mode, which enables a seamless transfer whenever the test mode is
deactivated.
Genera Generattor Commander or Commander
Instruction manual
Version: 2.07
470 © Arcteq Relays Ltd
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