Basler Electric BE1-87T - Manual (Page 70)

4-28 BE1-87T Installation 9171300990 Rev V
Figure 4-31. Three-Phase Connections, Wye-Delta Configuration, Internal Phase Compensation
The transformer in the example shown in Figure 4-30 has a delta connection on the secondary winding.
The currents in each winding of the delta are A, B and C respectively as reflected from the wye connected
primary winding. The delta connection of the transformer windings causes the current flowing in the phase
leads connected to the delta winding to be A-C, B-A and C-B respectively. The CT currents on the wye
side must be combined similarly to provide A-C, B-A and C-B to compensate. This is shown in Figure 4-
27 by selecting phase compensation jumper position ∆1 for the wye side input.
H
2
H
1
H
3 C
B
A
X
2
X
1
X
3 C
B
A
17
18
15
16
14
13
11
12
WYE
BE1-87T Switch
board
terminal
blocks
Phase shift jumper
position on analog
board #2.
D2751-23
03-12-98
∆ 1
H
0
X
2
X
3
X
1
H
2
H
3
H
1
H
0
B
C A