Transformer sizes – Xylem GSSERVICE R2 Service Manual Submersible Pumps & Jet Pumps User Manual
Page 92
Transformer Capacity Required
for Submersible Motors
A full 3Ø supply is recommended for all 3Ø
motors, consisting of three individual transformers
or one 3Ø transformer. “Open” delta or wye con-
nections using only two transformers can be used,
but are more likely to cause problems from current
unbalance.
Transformer ratings should be no smaller than
listed in the table for supply power to the motor
alone.
Smallest KVA Rating -
Submersible
Total
Each Transformer
3Ø Motor
3Ø Motor Open WYE
WYE
HP Rating
HP Rating
or Delta 2
Delta 3
Transformers Transformers
1.5
3
2
1
2
4
2
1.5
3
5
3
2
5
7.5
5
3
7.5
10
7.5
5
10
15
10
5
15
20
15
7.5
20
25
15
10
25
30
20
10
30
40
25
15
40
50
30
20
50
60
35
20
60
75
40
25
75
90
50
30
100
120
65
40
125
150
85
50
150
175
100
60
175
200
115
70
200
230
130
75
90
TRANSFORMER SIZES