User Manual Manual

7-6 Testing and Maintenance
Publication 825-UM001B-EN-P January 2001
Test with Single-Phase Current Source
The test with a 3-phase current source described on page 7-5 can also be performed with a
single-phase source. To do this, the earth (ground) fault protection by the Holmgreen method
must be switched off.
Figure 7.2 Test with a Single-Phase Current Source
ATTENTION
!
This test should be performed only by qualified personnel.
IMPORTANT
The test current may not flow through the core balance current
transformer.
825-MCM
825-M
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246
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Connection
Connection