Basler BE1-CDS220, Instruction Manual

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13-24 Testing And Maintenance BE1-CDS220
3. There is a problem with the settings or installation and the initial loading is great enough to cause a
differential alarm but not a trip.
NOTE
If the load picked up results in differential current greater than the alarm set point
(scenario 3), a record will be generated automatically by the differential alarm function. If
this occurs, it is still recommended to manually trigger generation of a new differential
check record so that you are assured that you are looking at up-to-date data.
4. There is a problem with the settings or installation and the initial loading is great enough to cause a
trip.
NOTE
If the load picked up results in a trip (scenario 4), examine the fault summary and
oscillography records to determine the cause of the trip. If it is not a fault, re-energize the
transformer and pick up less load; or, block the differential trip, re-energize the
transformer, and pick up the load. After the load is picked up, trigger a differential check
record. Once the problem has been corrected, unblock the differential element. Or, an
Exel spreadsheet template (CDSFAULT.xlt) is available from the web site
www.basler.com . The magnitude and angle of the currents recorded in the fault summary
report at the time of the trip can be entered into this spreadsheet along with the pertinent
differential and connections settings. The spreadsheet will then calculate the differential
currents after compensation which makes it easier to diagnose and correct the problem.