Block Schematic Diagram - ABB SPAC 536 C User Manual

Block schematic
diagram
4
Fig. 2. Block diagram for the directional neutral current relay module SPCS 3C4.
U Residual voltage
0
I Neutral current
0
BS1, BS2, BS3 External blocking signals
BTS1 Blocking signal for the operation of stage Iϕ>
BTS2 Blocking signal for the operation of stage Iϕ>>
BACTRL External control signal for selection of the operation characteristic I
or I cosϕ
0
SG1 Front panel selector switchgroup
SG2 Function selector switchgroup for the operation indicators
SGB Selector switches on the PC board for configuring incoming blocking
signals and outgoing start signals
SS1 Start signal of the low-set stage Iϕ>
TS1 Trip signal of the low-set stage Iϕ>
SS2 Start signal of the high-set stage Iϕ>>
TS2 Trip signal of the high-set stage Iϕ>>
AR1, AR3 Start initiation signals for an optional auto-reclose relay module
Y Yellow start indicator
R Red operation indicator
NOTE!
All input and output signals of the directional
neutral overcurrent relay module are not neces-
sarily wired to the terminals of every protection
relay unit incorporating the module. The sig-
nals wired to the terminals are shown in the
paragraph "Signal diagram" in the general
manual of the protection relay.
sinϕ
0