ABB Relion 670 Series Applications Manual page 68

Section 3
Configuration
• The IED is intended for busbar protection applications in big substations where dynamic Zone
Selection, quite large number of binary inputs and outputs and many CT inputs are needed.
The IED includes two differential zones and twenty-four CT inputs. Note that binary inputs can
be shared between phases by including the LDCM communication module. This simplifies
panel wiring and saves IO boards.
• This version can be used with external auxiliary 3-phase to 1-phase summation current
transformers with different turns ratio for each phase.
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1MRK 511 358-UUS A
Application manual