4-28
BE1-87T Installation
9171300990 Rev R
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
Δ
1
H
0
X
2
X
3
X
1
H
2
H
3
H
1
H
0
B
C
A
Figure 4-29. Three-Phase Connections, Wye-Delta Configuration, Internal Phase Compensation
The transformer in the example shown in Figure 4-29 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
Δ
1 for the wye side input.
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