ABB SPAC 531 C User Manual And Technical Description page 106

Block diagram
4
Fig. 1. Block diagram for the overcurrent relay module SPCJ 3C3.
I , I , I Measured phase currents
L1 L2 L3
BS1, BS2, BS3 External blocking signals
BTS1 Blocking signal for the tripping of stage I>
BTS2 Blocking signal for the tripping of stage I>>
SG1 Selector switchgroup on the front panel
SG2 Function selector switchgroup for the operation indicators
SGB Blocking signal selector switchgroup on the PC board and
starting signal selector switchgroup for the auto-reclose functions
SS1 Start signal of stage I>
TS1 Trip signal of stage I>
SS2 Start signal of stage I>>
TS2 Trip signal of stage I>>
AR1, AR2 Start signals for auto-reclose functions
Y Yellow indicator, starting
R Red indicator, tripping
NOTE!
All input and output signals of the relay module
are not necessarily wired to the terminals of any
protection relay incorporating this module. The
signals wired to the terminals are shown in the
diagram illustrating the interchange of signals
between the various modules of the protection
relay.