19
RMO60TD Getting Started
process begins. If it is not done before
START
is pressed, a warning message will be displayed and
demagnetization will not start. During the demagnetization process there will be visible message on the
display showing the progress of the demagnetization.
Note:
Never remove the current leads during the demagnetization process and always allow enough time for
the transformer being tested to completely demagnetize. Large transformers can require several minutes
to demagnetize.
During the demagnetization process the transformer will be charged and discharged
several times.
Once the demagnetization process is finished, the RMO60TD device displays the
message “Demagnetization done!”
Attention:
When the demagnetization process is manually stopped by pressing
STOP
, it is highly recommended to
follow the discharging LED and the buzzer and to be aware of the danger during the discharging
process.
6.4 Tap Changer Control Unit
The external Tap Changer Control cable is used for convenient tap changer testing.
After the RMO60TD has measured a tap it stands by waiting for the operator to move the transformer tap
changer to the next tap position and continue the measurement by pressing
OMEGA
on the unit.
The tap changer operation box on power transformers is normally not placed at the same place where
the RMO60TD is placed. The Tap Changer Control Unit block allows the operator to continue the next
tap measurement from the RMO60TD position. It is performed by pressing
UP/DOWN
on the Tap
Changer Control Unit.
The operator has to connect the Tap Changer Control cable from the RMO60TD to the tap changer
operation box. An example of that connection is shown on the figure below.
Figure 6-21:
Demagnetization menu
during demagnetization
Figure 6-22:
The demagnetization
menu after the process
is finished
