4.5.3.13 Mains Voltage Phase Rotation
General notes
NOTICE!
Damage to the control unit and/or generation equipment
• Please ensure during installation that all voltages applied to this unit are wired
•
correctly to both sides of the circuit breaker.
Failure to do so may result in damage to the control unit and/or generation equipment
due to closing the breaker asynchronous or with mismatched phase rotations and phase
rotation monitoring enabled at all connected components (engine, generator, breakers,
cable, busbars, etc.).
This function will block a connection of systems with mismatched phases only under the
following conditions:
• The voltages being measured are wired correctly with respect to the phase rotation
•
at the measuring points (i.e. the voltage transformer in front and behind the circuit
breaker)
• The measuring voltages are wired without angular phase shift or interruption from
•
the measuring point to the control unit
• The measuring voltages are wired to the correct terminals of the control unit (i.e. L1
•
of the generator is connected with the terminal of the control unit which is intended
for the L1 of the generator)
• The LogicsManager function "Enable MCB" (refer to parameter
) is false in
•
case of a incorrect rotation field
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 voltages and the configured phase rotation 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 voltages into the unit are
calculated as counterclockwise the alarm will be initiated. The direction of configured
rotation being monitored by the control unit is displayed on the screen.
If this protective function is triggered, the display indicates "Mns.ph.rot. mismatch" and
the logical command variable "07.05" will be enabled.
This monitoring function is only enabled if Mains voltage measuring (parameter
) is configured to "3Ph 4W" or "3Ph 3W" and the measured voltage exceeds 50 % of
the rated voltage (parameter
) or if Mains voltage measuring (parameter
) is configured to "1Ph 2W" (in this case, the phase rotation is not evaluated, but
defined by the 1Ph2W phase rotation (parameter
528
easYgen-3000XT Series
B37574
4 Configuration
4.5.3.13 Mains Voltage Phase Rotation
Released