Description Of 1 Ph Package B31A - ABB REB670 Applications Manual

Section 3
Configuration
3.1.8
56

Description of 1 ph package B31A

One-phase version of the IED with two low-impedance differential protection zones and
twenty-four CT inputs B31A.
• 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.
1MRK 505 337-UUS -
Application manual