Three Phase Power Transformers and Autotransformers without Voltage Control or with No Load Voltage Control
rated 67 ÷ 160 MVA
Miscellaneous
The transformers enclosed in this group comply to the conditions imposed by IEC 76 and the customer˘s requirements.
Conditions of operation
The transformers are intended to operate as unit transformers with the electrical generators at the ambient temperatures between max. + 40° C and - 30° C.
Transformers able to operate at the tropical temp. can be manufactured at the user's request.
The installation site altitude is max. 1000 m above the sea level.
Construction features
The magnetic circuit is made of carlyte insulated, grain oriented, cold rolled silicous steel sheet with low specific losses.
The windings are made of paper insulated copper wire.
The winding types used are: helical on the LV side and continuous in flat coils on the HV side.
The tank is cover or bell type, made of steel plate, welded construction, stiffened with ribs and is guaranteed and vacuum tested
Main accessories
Buchholz relay
magnetic oil level indicators
oil and winding temperature indicators
de-hydrating breather
HV, LV bushings
control cabinet
oil conservator
off load tap changer
pressure relief device
oil draining and filtering valves
coolers
moto-pumps
undercarriage(wheels)
Technical specific features
operating frequency: 50 Hz or 60 Hz
voltage control range on the HV side: ± 2 x 2.5%
cooling type:OFAF or OFWF
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) |
|---|
| 67 |
13.8/154 |
13 |
51 |
253 |
Ynd11 |
89300 |
6850x4085x5600 |
| 80 |
10.5/123 |
11.5 |
50 |
300 |
YNd11 |
95000 |
5325x4120x5730 |
| 80 |
10.5/123 |
13.5 |
45 |
305 |
YNd11 |
84300 |
5150x4200x5790 |
| 90 |
10.5/121 |
12.5 |
60 |
350 |
YNd11 |
96200 |
5200x3560x5680 |
| 132/176 |
72/16 |
17.2 |
67 |
472 |
YNd1 |
146500 |
6470x5590x6041 |
| 160 |
10.5/123 |
12.5 |
85 |
550 |
YNd11 |
136000 |
7740x5100x5570 |
| 1. | HV bushings |
| 2. | HV neutral bushing |
| 3. | LV bushings |
| 4. | Oil conservator |
| 5. | Off load tap changer |
| 6. | Manual driving device for tap changer |
| 7. | Pressure relief device |
| 8. | Jacking supports |
| 9. | Oil draining and filtering valve |
| 10. | Oil filtering valve |
|
| 11. | Control cabinet |
| 12. | Oil temperature indicator |
| 13. | Winding temperature indicator |
| 14. | Buchholz relay |
| 15. | Dehydrating breather |
| 16. | Magnetic oil level indicator |
| 17. | Wheels |
| 18. | Coolers |
| 19. | Motopumps |
|
