ABB REC670 Operator's Manual page 94

Section 11
Test the IED
88
Settings used during test of line differential protection including test mode setting.
With the line differential protection in test mode, it can be tested locally without
causing unwanted operation in the remote end.
Main menu/Test/Line differential test/LDCMX
The scale factor for current sent to remote end IED to be echoed back to local IED
during test is set here.
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Operator's manual