OMICRON 249
Off-service diagnostic methods
Procedure
To demagnetize the circuit breaker’s current transformers:
1. In the Settings and conditions area, enter the settings of the Demagnetization.
2. In the Measurements area, click Start.
The blue ring on the Start/Stop button is on.
3. Start the demagnetization by pressing the Start/Stop button.
The blue ring on the Start/Stop button flashes for approx. 3 seconds, and the lightning symbol in
Primary Test Manager and the red status light on the front panel are flashing.
4. After the initialization and analysis have finished, press the Start/Stop button again.
The blue ring on the Start/Stop button flashes for approx. 3 seconds, and the lightning symbol in
Primary Test Manager and the red status light on the front panel are flashing.
Table 17-85: Demagnetization settings
Setting Description
CT settings
Number of CT cores
(per phase)
Number of cores of the circuit breaker’s current transformers
If the number of current transformers cores is not known, select the
Unknown check box.
Other
Single side grounded
Both side grounded
Select the Single side grounded or Both side grounded option.
WARNING
Death or severe injury caused by high voltage or current possible
► Do not enter the high-voltage test area while testing with CIBANO 500 since any part of the
circuit breaker can carry dangerous voltages.
► Stay in the work area during the test.
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