ABB SPAC 531 C User Manual And Technical Description page 3

Features
Area of
application
Complete field unit with definite or inverse time
overcurrent protection, directional earth-fault
protection and auto-reclosing
User-programmable status indication and feeder
level interlocking logic
Local and remote status indication of seven
objects and local or remote control of six objects
Seven user-programmable binary inputs with
local and remote indication
The integrated feeder terminals SPAC 531 C
and SPAC 631 C are designed to be used as a
cubicle-based protection and remote control
interface unit. In addition to protection, control
and measurement functions the unit is provided
with the data communication properties needed
for the control of the feeder. Connection to
FEEDER TERMINAL
Fig. 1. Distributed protection and control system based on SPAC 531 C feeder terminals
Measurement and indication of phase currents,
phase-to-phase voltages, energy, active and re-
active power
Serial interface for remote control and data
interchange
Continuous self-supervision for maximum reli-
ability
higher level substation control equipment is
carried out via a fibre-optic serial bus.
The feeder terminals are available in two me-
chanical designs, in a 19 inch 3U subrack for
SPAC 531 C and a half of a full width 19 inch
6U subrack for SPAC 631 C.
CONTROL ROOM
CONNECTION
SUBSTATION OF
REMOTE CONTROL
SYSTEM
OPTIC SPA-BUS
FEEDER TERMINAL
FEEDER TERMINAL
FEEDER TERMINAL
3