KACO Powador XP500-XP550-HV TL - Manual (Page 15)

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Z
H
(1%)
Z
La
(5%)
Z
Lb
(5%)
Z
Lc
(5%)
Z
Ld
(5%)
Fig. 20 Equivalent series impedance Z(%) of section-winding transformer
4. No neutral point is required on the low voltage side. Nevertheless, if a neutral point shows up on
the low‑voltage side, this neutral point must not be either connected or grounded.
5. Section-winding transformers with varying windings each on the high‑voltage side and the
low‑voltage side can be used. For example YNd11d11d11d11, YNd5d5d5d5, YNd1d1d1d1 or
Dy11y11y11y11, Dy5y5y5y5, Dy1y1y1y1 with an ungrounded neutral point on the low‑voltage side
(see Fig.21).
2
4
6
5
3
1
2
4
6
5
3
1
2
4
6
5
3
1
2
4
6
5
3
1
2
4
6
5
3
1
2
4
6
5
3
1
1W 1V 1U
3W 3V 3U 1W 1V 1U
1W
1V
1U
3W
3U
3V
1W
1U
1V
2
4
6
5
3
1
2
4
6
5
3
1
2
4
6
5
3
1
2W 2V 2U
2W
2U
2V
2
4
6
5
3
1
2
4
6
5
3
1
2
4
6
5
3
1
4W 4V 4U
4W
4U
4V
Fig. 21 Diagram of section-winding transformer