Chapter 5 - Commissioning
94 3BHS335648 E82 UNITROL 1020 User Manual
Optimize Iemin / Iemax Limiter
Optimize PQ Limiter
The setting of the PQ limiter must be coordinated with the settings of the generator
protection. As a rule, the limiter should be set at least 5% lower.
PF and Var regulator, stability, setpoint range.
To enable correct operation of PQ Limiter, the PF / Var regulator must be tuned, even if
these modes are not used.
5.5.3 Synchronization
It is a prerequisite for the correct functioning of
the synchronization that there is no error in
phase or magnitude between UNET and UM,
caused by wrong connection or ratio of PTs on
the grid side and generator side.
Another prerequisite is the correct rotating
direction of the three phases on the machine
and line side.
Measurement of the phase angle of the voltages UNET and UM
Open the isolator, close the circuit breaker (CB). Due to safety reasons the
measurements have to be obtained not only from the Monitor\Oscilloscope or
Monitor\Sync Diagram but also from an external oscilloscope.
“Blind” synchronization
Monitor the Synchronoscope (Monitor\Sync Diagram) by disabling the closing
mechanism of the circuit breaker.
“Live” synchronization
Record the event with a Synchronoscope.
CAUTION!
The synchronoscope must stand at “twelve o’clock”. If the
synchronoscope stands at “six o’clock”, one voltage is incorrectly
connected. In other positions, either measuring is being carried out on
incorrect phases or a phase shift caused by the connection group of a
step-up transformer has not been compensated.
To Next Page
Loading...
