Eaton Industrial Switchgear - Matching of Voltage and Current

15 / 23

2010 CA08103002Z-EN
Transformers
Accessories
15/11
Accessories
Current
range
A
For use
with
Part no. suffix
Article no. for
ordering only
with basic unit
Price
See price
list
Std. pack Notes
Additional tappings
For deviations in the rated input or output voltage of
more than ± 10 %:
• Ask about size of the transformer.
• Also state distribution of rating in addition to the
tapping.
< 16 STZ Primary
side
Single-phase
transformers
+ZA16P(*)
931897
1 off Selection of the correct tap.
Ordering example for single-phase transformers:
• Selected transformer STZ0.25(400/24)
• Required voltage of additional tapping 22 V
• The current for selection of the tapping is calculated as follows:
I = S/U
I = current
S = apparent power
U = voltage of the tapping
I = 250/22 = 11.4 A￫+ZA16
For the secondary tapping, the correct suffix is:
+ZA16S(22)
A primary side additional tapping is determined in the same manner.
< 16 STZ Second-
ary
Single-phase
transformers
+ZA16S(*)
931895
< 16 DTZ Primary
side
Three-phase
transformers
+DZA16P(*)
930200
Selection of the correct tap.
Ordering example for three-phase transformers:
• Selected transformer DTZ0.25(400/24)
• Required voltage of additional tapping 22 V
• The current for selection of the tapping is calculated as follows:
I = S/(√3 x U)
I = current
S = apparent power
U = voltage of the tapping
I = 250/( √3 x 22) = 6.6 A￫+DZA16
For the secondary tapping, the correct suffix is:
+DZA16S(22)
A primary side additional tapping is determined in the same manner.
< 16 DTZ Second-
ary
Three-phase
transformers
+DZA16S(*)
200406
Additional windings
For primary extra winding please enquire
Amaximum of 5 additional windings can be ordered for
the primary and/or secondary side.
< 16 STZ Second-
ary
Single-phase
transformers
+ZW16S(*V*VA)
279276
1 off Ordering example for single-phase transformers:
Transformer STZ...(400 V/200 V) with 1000 VA and a secondary
additional winding for 100 V and 200 VA, resulting in the required
rating of 1200 VA. The correct part no. is:
STZ1.3(400/200)
For pricing of the additional winding, the current is calculated as
follows.:
I = S/U
I = current
S = apparent power of the additional winding
U = voltage of the additional winding
I = 200/100 = 2 A￫+ZW16
For the secondary additional winding, the correct suffix is:
+ZW16S(100V200VA)
Notes Information relevant for export to North America
UL/CSA approval not required
+ZA..., +DZA..., +ZW... HPL15011EN