4
Block diagram
Fig. 2. Block diagram for combined overvoltage and undervoltage relay module SPCU 3C14.
U
12
, U
23
, U
31
Measured phase-to-phase voltages
BS1, BS2, BS3 Blocking signals
BTS2 Blocking of the tripping of the U< stage
SG1 Front panel programming switchgroup
SG2 Software selector switchgroup for defining the mode of function of the
start and operation indicators
SGB Selector switchgroup for configuration of blockings (on the PC-board)
SS1 Start signal of the U> stage
TS1 Trip signal of the U> stage
SS2 Start signal of the U< stage
TS2 Trip signal of the U< stage
Y Yellow indicator
R Red indicator
NOTE!
All input and output signals of the relay module
are not necessarily wired to the terminals of
every protection relay unit including the over-
voltage and undervoltage relay module.
The signals wired to the terminals are shown in
the signal diagram of the concerned protection
relay unit, see user's manual.
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