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Connection
diagram
Fig. 3. Block schematic diagram of the biased differential relay SPAD 330 C.
U
A, E
I RF
Ul
U2
U3
U4
U5
U6
P2
P1
S2
S1
Auxiliary voltage
aux
Output relays
Self-supervision
Differential relay module of L1 phase
Differential relay module of L2 phase
Differential relay module of L3 phase
Output relay module
Power supply module
Input/output module
P1
P2
S1
S2
SPCD 3C21
SPCD 3C22
SPCD 3C23
SPTR 5B4
SPGU 240A1, SPGU 48B2
SPTE 6B3
L1
L2
L3
5
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