3
Features
Complete field unit with definite or inverse time
overcurrent and earth-fault protection
Complete control module for local and remote
control of one object
Local and remote status indication of maximum
three objects and local or remote control of one
object
User-programmable feeder level interlocking
system for preventing not permitted switching
operations
Six user-programmable binary inputs with local
and remote indication
Phase current, energy, active and reactive power
measurement and indication
Serial interface for remote control and data
interchange
Continuous self-supervision for maximum reli-
ability
Area of
application
The feeder terminals SPAC 310 C and SPAC
312 C are designed to be used as cubicle-based
protection and remote control interface units.
In addition to protection, control and measure-
ment functions the unit is provided with the
data communication properties needed for the
control of the feeder. Connection to higher level
substation control equipment is carried out via
a fibre-optic serial bus.
OPTIC SPA-BUS
SUBSTATION OF
REMOTE CONTROL
SYSTEM
CONTROL ROOM
CONNECTION
FEEDER PROTECTION
AND CONTROL UNIT
FEEDER PROTECTION
AND CONTROL UNIT
FEEDER PROTECTION
AND CONTROL UNIT
FEEDER PROTECTION
AND CONTROL UNIT
Fig. 1. Distributed protection and control system based on feeder terminals SPAC 310 C or
SPAC 312 C.