ABB SPAU 341 C - Page 17

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Fig. 10. Voltage regulators SPAU 341 C1 in parallel operation using the minimizing circulating
current principle. The operation mode of the regulators is automatically selected according to the
circuit breaker configuration. The communication between the regulators is achieved by using
SPA/LON gateways.
Table 3. Regulator mode compared to circuit breaker configuration
CB 1 CB 2 CB 3 Regulator 1 Regulator 2
open closed open manual manual
closed closed open automatic manual
open closed closed manual automatic
closed closed closed parallel parallel
open open closed manual automatic
closed open open automatic manual
closed open closed automatic automatic
M
RaiseLower
Man'
Auto'
CB1
CB2
T1
SPAU 341 C
R1 Adr. 10/11
L
N
Parallel
(RSV)
–
SPA-ZC 100 AB
Serial
port
––
Single/
Parallel
Man'
Auto'
M
RaiseLower
Man'
Auto'
CB3
T2
SPAU 341 C
R2 Adr. 20/21
L
N
Parallel
(RSV)
–
SPA-ZC 100 AC
Serial
port
––
Single/
Parallel
Man'
Auto'
Tx
Rx
Tx
Rx
U
12
I
L1
U
12
I
L1