ABB Switzerland Ltd REG 316*4 1MRB520049-Uen / Rev. C
2-2
2. DESCRIPTION OF HARDWARE
2.1. Summary
The hardware of the digital protection scheme RE. 316*4 com-
prises 4 to 8 plug-in units, a connection unit and the casing:
· Input transformer unit Type 316GW61
· A/D converter unit Type 316EA62
or Type 316EA63
· A/D converter unit Type 316EA62
· Main processor unit Type 316VC61a
or Type 316VC61b
· 1 up to 4 binary I/O units Type 316DB61
or Type 316DB62
or Type 316DB63
· Auxiliary supply unit Type 316NG65
· Connection unit Type 316ML61a
or Type 316ML62a
· Casing and terminals for analogue signals and connectors for
binary signals.
The A/D converter Type 316EA62 or 316EA63 is only used in
conjunction with the longitudinal differential protection and
includes the optical modems for transferring the measurements
to the remote station.
Binary process signals are detected by the binary I/O unit and
transferred to the main processor which processes them in rela-
tion to the control and protection functions for the specific project
and then activates the output relays and LED’s accordingly.
The analogue input variables are electrically insulated from the
electronic circuits by the screened windings of the transformers
in the input transformer unit. The transformers also reduce the
signals to a suitable level for processing by the electronic cir-
cuits. The input transformer unit provides accommodation for
nine transformers.
Essentially the main processor unit 316VC61a or 316VC61b
comprises the main processor (80486-based), the A/D converter
unit, the communication interface control system and 2 PCMCIA
slots.
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