ABB REB670 - Description of 1 Ph Package B31 A

3.1.8 Description of 1 ph package B31A
SEMOD129275-58 v8
One-phase version of the IED with two low-impedance differential protection zones
and twenty-four CT inputs B31
A.
• 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.
Section 3 1MRK 505 370-UUS A
Configuration
62 Busbar protection REB670 2.2 ANSI
Application manual