Electrical Network Interconnecting Transformers and Autotransformers
Miscellaneous
The transformers belonging to this class comply to the requirements of IEC 76 standard
or standards required by the customers. They are meant to operate in electrical network interconnecting substations.
Conditions of operation
The transformers operate at ambient temperatures of max. +40ºC and min. -35ºC.
Max. installation altitude above the sea level: 1000 m.
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 profiled copper wire. The windings are helical or continuous type in flat coils, and the HV and tapped ones are continuous interleaved.
The tank is bell type of welded steel sheet, vacuum tested and guaranteed.
Main accessories
HV and LV bushings
oil conservator
on load tap changer
control cabinet
coolers
motopumps
undercarriage (wheels)
Buchholz relay
magnetic oil level indicator
pressure relief device
dehydrating air breather
oil and winding temperature indicators
oil draining and filtering valve
Technical specific features
operating frequency: 50 Hz
operating voltage on the HV side: 230; 400 kV
taping range on the HV: ± 12 x 1%
cooling type: OFAF
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) |
|---|
| 160 | 230/33 |
16 | 90 |
580 | YNd11 |
167000 | 9800x4880x7500 |
| 200 | 230/123/10.5 |
9 | 70 |
425 | YN0d5 |
151200 | 10770x5410x7280 |
| 250/250/80 |
400/121/20 |
16 | 133 |
510 | YNyn0d11 |
342000 | 17500x5560x10240 |
| 250 | 400/121/20 |
17 | 190 |
850 | YNyn0d11 |
332000 | 17530x5560x10080 |
| 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. | 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 |
|
