Dry type Power Transformers for Rectifier Plants and for Converters
rated 430; 550; 630; 720; 900 kVA
Miscellaneous
The transformers belonging to this group comply to the conditions imposed by the IEC 146. They are three phase, dry type transformers with natural cooling and are destined to supply the rectifier plants and converters.
Conditions of operation
Temperate environment in properly ventilated closed room:
IP00 or IP22 protection degree (with housing for protection).
Construction features
The magnetic circuit is of carlyte insulated, grain oriented, cold rolled silicous steel sheet with low specific losses.
The windings are made of copper wire, insulated with enamel and glass fibber impregnated in electroinsulating varnish.
The practical winding types are: cylindrical on the LV side and continuous on the HV side.
The insulation of the winding is made of glass fibber fabric in layers.
The control on the high voltage range is made at a terminal box.
The connections are made of copper buses, insulated with a glass-fibber strip.
The terminals are brought out of the shorter housing walls through bushings for high voltage side, and through copper buses for the low voltage side.
The protection housing is made of steel sheet, fixed on a metallic structure.
At the upper part, it is provided with louvers and holes for air exchange and at the lower side, the transformer has a skid and earthing pad.
The transformer lifting is made by means of lifting eyes provided on the structures.
Main accessories
HV bushings
LV copper buses
earthing terminal
skid
housing;
Technical specific features
operating frequency: 50 Hz
LV copper buses
operating voltages: high voltage: 6; 10kV
insulation class: F
low voltage: 0.36 to 0.825 kV-housing
voltage control range on the HV side: ± 5%
cooling type: ANAN
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) |
|---|
| 30 | 60/0.38 |
6.5 | 1.4 |
4 | Dy11 |
1936 | 1960x800x1150 |
| 430 | 10/0.42 |
6.5 | 1.5 |
4 | Dy11 |
2060 | 2270x1000x2000 |
| 550 | 6/0.44 |
6.5 | 1.5 |
5 | Dy11 |
2135 | 1960x760x1270 |
| 630 | 6/0.44 |
5.5 | 1.75 |
5.5 | Dy11 |
2490 | 1590x840x1490 |
| 720 | 6/0.36 |
6.5 | 2.05 |
6 | Dd0 |
2950 | 2100x1000x1625 |
| 720 | 10/0.42 |
6.5 | 1.95 |
6 | Dy11 |
2925 | 2280x1010x1565 |
| 900 | 6/0.825 |
6.5 | 2.2 |
6.6 | Dy11 |
3360 | 2220x750x1480 |
| 900 | 6/0.43 |
6.5 | 2.2 |
6.6 | Dy11 |
3490 | 2220x750x1480 |
| 1. | LV buses |
| 2. | HV bushing |
| 3. | HV protection box |
| 4. | Lifting lugs for housing |
| 5. | Housing |
|
| 6. | Lifting lugs |
| 7. | Grounding terminal |
| 8. | Undercarriage |
| 9. | Removable cover |
| 10. | Name plate |
|
