Generator Phase Rotation - Woodward easYgen-2000 Series User Manual

4.4.1.13

Generator Phase Rotation

General notes
37535B
Configure Monitoring > Generator > Generator Phase Rotation
NOTICE!
Damage to the control unit and/or generation
equipment
– Ensure that the control unit is properly connected
to phase voltages on both sides of the circuit
breaker(s) during installation.
Failure to do so may result in damage to the control
unit and/or generation equipment due to the breaker
closing asynchronously or with mismatched phase
rotations. Also ensure that phase rotation monitoring is
enabled at all connected components (engine, gener‐
ator, breakers, cable, busbars, etc.).
This function will block a connection of systems with
mismatched phases only under the following condi‐
tions:
– The voltages being measured are wired correctly
with respect to the phase rotation at the measuring
points (i.e. the potential transformers in on both
sides of the circuit breaker)
– The voltages being measured are wired so that
angular phase shifts or any interruptions from the
measuring point to the control unit do not exist
– The voltages being measured are wired to the cor‐
rect terminals of the control unit (i.e. L1 phase of
the generator is connected with the terminal of the
control unit which is intended for the generator L1
phase)
– The configured alarm class is of class C, D, E, or F
(shutdown alarm).
Correct phase rotation of the phase voltages ensures that damage
will not occur during a breaker closure to either the mains or the
generator. The voltage phase rotation alarm checks the phase
rotation of the measured voltages and the configured phase rota‐
tion to ensure they are identical.
The directions of rotation are differentiated as "clockwise" and
"counter clockwise". With a clockwise field the direction of rotation
is "L1-L2-L3"; with a counter clockwise field the direction of rotation
is "L1-L3-L2". If the control is configured for a clockwise rotation
and the measured voltages are monitored as counterclockwise, the
alarm will be initiated.
easYgen-2200/2500 | Genset Control
Configuration
127