Dry type Power Transformers
rated 10kVA ÷ 1600 kVA
Miscellaneous
The transformers belonging to this class comply to the requirements of the Romanian standards (STAS 1703) or to the internationally recognized standards required by the customers, mainly IEC 726.
Conditions of operation
The transformers are meant to supply the inner auxiliaries of the power stations within the underground train stations and residential districts. The transformers are rated to operate in suitably ventilated closed rooms and are supplied from electrical grids free from the atmospheric surge voltages.
The ambient temperatures are:
max. ambient temperature: +40° C
max. air daily average temperature +30° C
min. air temperature -15° C
max. altitude: 1000 m above the sea level
Protection degree: IP00 or IP20
Construction features
The magnetic circuit is made of carlyte insulated, grain oriented, cold rolled silicous steel sheet
The windings are manufactured of glass-fiber and enamel insulated cooper wire, impregnated in electro-insulating varnish.
The winding types used are: cylindrical or helical on the LV side and layered or continuous, in flat coils on the HV side.
The voltage control on the HV side is achieved at a terminal plate, by means of riglets (bars).
The HV and LV connections are manufactured of glass fiber strip insulated copper buses.
The outlets are taken out on the transformer small side or top, on the HV side through bushings and on the LV one through buses.
Function of the customer's request and with the manufacturer's agreement, the outlets may be located otherwise too: by performing the required changes of the overall dimensions.
The protection housing is made of steel sheet placed on a metal frame. At the top it is provided with louvers enabling air free flow.
The transformer may be lifted by means of lugs provided on its structure.
Main accessories
HV bushings
LV buses
grounding terminal
undercarriage
housing
Technical specific features
operating frequency: 50 Hz
operating voltage : HV: 6; 10 kV; LV: 0.4 kV LV copper buses
voltage control range on the HV side± 2 x 2.5%; ± 5%; ± 10%
cooling type: ANAN
insulation class: F
permissible temperature rises in windings: 100° C
The main equipment sorts of the group are presented in the following table:
Rating
(kVA) | Voltage
(kV) |
Uk
(%) | Po
(kW) |
Pk
(kW) | Connection group |
Overall Weight
(kg) | Overall Dimensions
(LxWxH)(mm) |
|---|
| 10 |
0.38/0.048 |
3 |
0.11 |
0.25 |
Dy11 |
140 |
700x300x440 |
| 25 |
0.38/0.052 |
4 |
0.17 |
0.4 |
Yyn0 |
240 |
850x355x530 |
| 40 |
0.38/0.122 |
4 |
0.24 |
0.68 |
Yy0 |
300 |
805x350x570 |
| 60 |
0.5/0.23 |
4 |
0.4 |
1 |
Yy0 |
450 |
950x510x780 |
| 100 |
10/0.4 |
3.5 |
0.86 |
1.05 |
Yy0 |
1045 |
1925x840x1060 |
| 160 |
6/0.47 |
8 |
0.55 |
2.8 |
Yyn0 |
746 |
1240x440x960 |
| 200 |
6.3/0.4 |
4 |
0.95 |
2.5 |
Yyn0 |
1085 |
1280x620x1258 |
| 250 |
20/0.4 |
6 |
1.3 |
3.2 |
Dyn5 |
1670 |
1640x676x1500 |
| 315 |
6/0.47 |
4 |
1.4 |
2.4 |
Yyn0 |
2125 |
2340x780x1725 |
| 400 |
6.3/0.4 |
6 |
1.5 |
3.8 |
Dyn5 |
1885 |
2200x1000x1350 |
| 630 |
6.3/0.66 |
6 |
1.75 |
6 |
Dy05 |
2600 |
2155x1030x1670 |
| 630 |
20/0.4 |
6 |
2.3 |
7.2 |
Dyn5 |
2485 |
1840x800x1620 |
| 750 |
13.8/0.4 |
8 |
1.9 |
6.5 |
Dyn11 |
3120 |
1750x850x1880 |
| 800 |
6/0.427 |
6 |
2.1 |
7 |
Dd6 |
2846 |
1630x790x1643 |
| 900 |
6/0.66 |
6.5 |
2.2 |
6.8 |
Dy11 |
3300 |
2150x800x1355 |
| 1000 |
6/0.4 |
6 |
2.5 |
8.5 |
Dyn5 |
3370 |
2200x1050x1840 |
| 1000 |
10/0.4 |
6 |
2.7 |
8.5 |
Dyn5 |
3640 |
2300x1100x1950 |
| 1600 |
6.3/0.4 |
6 |
3 |
11 |
Dyn-5 |
5655 |
2660x1050x2360 |
| 1. | LV buses |
| 2. | HV bushing |
| 3. | Lifting lug |
| 4. | Name plate |
| 5. | Warning name plate |
| 6. | Alarms name plate |
|
| 7. | Grounding terminal |
| 8. | Undercarriage |
| 9. | Temperature microrelay |
| 10. | Shutter |
| 11. | Lifting lugs for housing |
| 12. | Removable cover |
|
