ABB SPAU 341 C - Page 14

14
M
M
Raise LowerRaiseLower
U
12
Raise' Raise' Lower'Lower'
Man' Aut/Man
Auto' Auto'
Man'
-
-
-
-
+
+
R2
SPAU 341 C1
CB1
CB2
CB3
TR1
TR2
R1
SPAU 341 C1
TCO TCO
TCO
U
12
I
L1
I
L2
I
L3
I
L1
I
L2
I
L3
~
N
~
N
N N
SGF1/1=0 SGF2/8=0SGF2/8=0SGF1/1=0
SGF2/6=0
SGF2/7=0
SGF2/6=0
SGF2/7=0
N N
N N
Fig. 7.The voltage regulator SPAU 341 C1 in parallel operation using the master/slave principle.
Three phase currents measured on the primary side of the transformer for overcurrent blocking
purpose. No line drop compensation used. Automatic selection of master regulator using digital
inputs. The TCO signal from the tap-changer with the longest operate time is connected to the
regulators to prevent regulating pulses during tap-changer operation.
Table 1. Regulator mode compared to circuit breaker configuration
CB 1 CB 3 Regulator 1 Regulator 2
open open as before as before
closed open automatic (master) manual (slave)
open closed manual (slave) automatic (master)
closed closed automatic (master) manual (slave)