Three Phase Power Transformers for the Internal Services of the Power Plant
Miscellaneous
The transformers contained in this group comply to the conditions imposed by the IEC 76 standard and the customer's requirements.
Conditions of operation
The transformers are destined to supply with electric power the own services in thermal power station.
Transformers being able to operate at tropical temperatures can be manufactured at the user's request.
The altitude of the installation site is max. 1000 m above the sea level.
Construction features
The magnetic circuit is made of carlyte insulated grain oriented cold rolled silicous steel sheets, with low losses.
The windings are made of paper insulated copper or aluminium wire. The windings types used are: helical on the LV side and continuous in the flat coils on the HV side.
The tank is bell or cover type, made of steel plate, welded construction, consolidated with ribs.
Main accessories
HV and LV bushings
oil conservator
Buchholz relay
magnetic oil level indicators
oil and winding temperature indicator
de-hydrating breather with silicagel
pressure relief device
control cabinet
off load tap changer
"out of tank" OLTC
motor drive for OLTC
undercarriage (wheels)
oil draining and filtering valve
radiators with fans
Technical specific features
The main equipment sorts of the group are presented in the following table:
Rating
(MVA) | Voltage
(kV) |
Uk
(%) | Po
(kW) |
Pk
(kW) | Connection group |
Overall Weight
(kg) | Overall Dimensions
(LxWxH)(mm) |
|---|
| 6.3 | 10/0.66 |
10 | 6.5 |
60 | Dyn5 |
157000 | 3370x3120x3100 |
| 10 | 150/21.6 |
10 | 11 |
56 | YNyn0 |
37800 | 5990x3850x4815 |
| 13.5/18 | 11.5/6.5 |
13.3 | 14.5 |
90 | Dyn11 |
34500 | 5415x3280x4030 |
| 20 | 33/11.5 |
10 | 15 |
92 | Dyn1 |
39000 | 4450x4125x3950 |
| 25 | 15/6.3 |
8 | 20 |
100 | Dd12 |
38350 | 4980x3692x4510 |
| 25 | 116/6.3 |
14 | 25 |
143 | YNd11 |
42000 | 5866x5000x5335 |
| 40 | 116/6.3 |
12.5 | 31 |
165 | YNd11 |
52700 | 6400x4036x4610 |
| 40 | 24/6.3 |
11 | 34 |
180 | Dd12 |
56800 | 6000x4000x4555 |
| 40/40/40 | 158/38.5/11 |
17 | 47 |
210 | YNyn0d11 |
81500 | 7325x3965x6130 |
| 42/21/21 | 24/6.3/6.3 |
5.73 | 36 |
65 | Dynyn11 |
60500 | 5650x3720x5000 |
| 1. | HV bushings |
| 2. | HV neutral bushing |
| 3. | LV bushings |
| 4. | Oil conservator |
| 5. | On-load-tap-changer |
| 6. | Motor drive for OLTC |
| 7. | Pressure relief device |
| 8. | Dehydrating breather |
| 9. | Radiator |
|
| 10. | Jacking supports |
| 11. | Oil draining and filtering valve |
| 12. | Control cabinet |
| 13. | Wheels |
| 14. | Fans |
| 15. | Winding temperature indicator |
| 16. | Oil temperature indicator |
| 17. | Buchholz relay |
|
