400kV 330kV Three-Phase Three-Winding On-Load Tap-Changing Autotransformer
Key attributes
| Brand | ROCKWILL |
| Model NO. | 400kV 330kV Three-Phase Three-Winding On-Load Tap-Changing Autotransformer |
| Rated voltage | 400kV |
| Rated frequency | 50/60Hz |
| Series | OSFSZ |
Product descriptions from the supplier
Description：
This is a core medium and high-voltage power equipment, featuring a three-winding structure to flexibly match 400kV/330kV and lower voltage levels for efficient power transmission. Its on-load tap-changing function enables voltage adjustment without grid disconnection, ensuring uninterrupted power supply. Adopting high-quality materials and advanced cooling technology, it boasts low loss, strong short-circuit resistance, and meets IEC standards. Equipped with basic monitoring components, it supports convenient operation and maintenance, making it ideal for regional grid interconnection and key power supply projects.
Product Characteristics:
Reasonable structure based on modern calculation technology, analysis of the electrical, magnetic, force and thermal characteristics of the transformer.
Advanced performance based on IEC standards, specially designed as customer requirements, obviously lower PD than the value in IEC60076-3.
High reliability based on the analysis of electrical, magnetic, force and thermal characteristics, reasonable transformer insulation structure, proper ampere turn distribution and the cooling system resulting in high ability of withstanding over-voltage and short-circuit current, no possibility of local overheat.
Optimal accessories：Superior user experience based on good visual, leak-free, un-tanking, maintenance-free.
Technical Parameters
Among these, some autotransformers cover non-standard voltage levels including 121kV, 132kV, 138kV, 200kV, 225kV, 230kV, 245kV, 275kV, 330kV, 345kV, 400kV and 756kV, We also provide customization services.
330kV 90000kVA~720000kVA Three-phase Double-winding Power Transformer with Off-circuit Tap-changer
Rated capacity (kVA) |
Voltage combination and tapping range |
Vector group |
Energy consumption class Ⅰ |
Energy consumption class Ⅱ |
Energy consumption class Ⅲ |
Short-circuit impedance (%) |
||||
HV tapping range (%) |
LV (kV) |
No-load loss (kW) |
On-load loss (kW) |
No-load loss (kW) |
On-load loss (kW) |
No-load loss (kW) |
On-load loss (kW) |
|||
90000 |
345 345±2×2.5% 363 363±2×2.5% |
10.5 13.8 15.75 18 20 |
YNd11 |
37 |
247 |
44 |
247 |
54 |
260 |
14 ~ 15 |
120000 |
47 |
306 |
55 |
306 |
68 |
323 |
||||
150000 |
56 |
362 |
66 |
362 |
81 |
382 |
||||
180000 |
64 |
415 |
75 |
415 |
93 |
438 |
||||
240000 |
80 |
515 |
94 |
515 |
116 |
543 |
||||
360000 |
109 |
722 |
129 |
722 |
158 |
762 |
||||
370000 |
111 |
736 |
131 |
736 |
162 |
777 |
||||
400000 |
118 |
780 |
139 |
780 |
171 |
824 |
||||
720000 |
183 |
1212 |
216 |
1212 |
266 |
1280 |
||||
Note: Transformers with various special parameters and performance can be manufactured according to customer requirements.
330kV 90000kVA~240000kVA Three-phase Three-winding Power Transformer with Off-circuit Tap-changer
Rated capacity (kVA) |
Voltage combination and tapping range |
Vector group |
Energy consumption class Ⅰ |
Energy consumption class Ⅱ |
Energy consumption class Ⅲ |
Capacity assignment (%) |
Short-circuit impedance (%) |
|||||
HV tapping range(kV) |
MV (kV) |
LV (kV) |
No-load loss(kW) |
On-load loss(kW) |
No-load loss(kW) |
On-load loss(kW) |
No-load loss(kW) |
On-load loss(kW) |
HV-MV 24 ~ 26 HV-LV 14 ~ 15 MV-LV 8 ~ 9 |
100/100/100 |
||
90000 |
330±2×2.5%345±2×2.5% |
121 |
10.5 13.8 15.75 |
YN yn0d11 |
42 |
302 |
50 |
302 |
62 |
318 |
||
120000 |
53 |
374 |
62 |
374 |
77 |
394 |
||||||
150000 |
63 |
442 |
74 |
442 |
91 |
466 |
||||||
180000 |
72 |
507 |
85 |
507 |
104 |
535 |
||||||
240000 |
89 |
629 |
105 |
629 |
130 |
664 |
||||||
Note:
The data in the above sheet are applicable to step-up transformer.
The capacity allocation of the step-up type can also be (100/50/100)%.
Step-down type transformer can be provided as required, its short circuit impedance: HV-LV 24%~26%, HV-MV14%~15%, MV-LV 8%~9%, and its capacity can be (100/100/50)% or (100/50/100)%.
.Short circuit impedance in the sheet is based on 100% rated capacity.
5Transformers with various special parameters and performance can be manufactured according to customer requirements.
330kV 90000kVA~360000kVA Three-phase Three-winding Autotransformer with Off-circuit Tap-changer (Regulating in Series Winding)
Rated capacity (kVA) |
90000 |
120000 |
150000 |
180000 |
240000 |
360000 |
|
Voltage combination and tapping range -
|
HV tapping range(kV) |
330±2×2.5% |
|||||
MV (kV) |
121 |
||||||
LV (kV) |
10.5、11、35、38.5 |
||||||
Vector group |
YN a0d11 |
||||||
Energy consumption class Ⅰ |
No-load loss(kW) |
25 |
31 |
37 |
42 |
53 |
72 |
On-load loss(kW) |
237 |
292 |
347 |
396 |
492 |
668 |
|
Energy consumption class Ⅱ |
No-load loss(kW) |
29 |
36 |
44 |
50 |
62 |
85 |
On-load loss(kW) |
237 |
292 |
347 |
396 |
492 |
668 |
|
Energy consumption class Ⅲ |
No-load loss(kW) |
36 |
45 |
54 |
62 |
77 |
104 |
On-load loss(kW) |
250 |
308 |
366 |
418 |
520 |
705 |
|
Short-circuit impedance (%) |
HV-MV 10~11、HV-LV 24~26、MV-LV 12~14 |
||||||
Capacity assignment (%) |
100/100/30 |
||||||
Note:
The data in the above sheet are applicable to step-down type transformer.
The step-up type transformer can be provided as required, and its short circuit impedance: HV-LV 10%~11%, HV-MV 24%~26%, MV-LV 12%~14%.
Short circuit impedance in the sheet is based on 100% rated capacity.
Transformers with various special parameters and performance can be manufactured according to customer requirements.
330kV 90000kVA~360000kVA Three-phase Three-winding Autotransformer with On-load Tap-changer (Regulating at the End of Series Winding)
Rated capacity (kVA) |
90000 |
120000 |
150000 |
180000 |
240000 |
360000 |
|
Voltage combination and tapping range -
|
HV tapping range(kV) |
330±8×1.25%、345±8×1.25% |
|||||
MV (kV) |
121 |
||||||
LV (kV) |
10.5、11、35、38.5 |
||||||
Vector group |
YN a0d11 |
||||||
Energy consumption class Ⅰ
|
No-load loss(kW) |
26 |
32 |
38 |
43 |
54 |
74 |
On-load loss(kW) |
235 |
292 |
345 |
396 |
492 |
668 |
|
Energy consumption class Ⅱ
|
No-load loss(kW) |
31 |
38 |
45 |
51 |
64 |
87 |
On-load loss(kW) |
235 |
292 |
345 |
396 |
492 |
668 |
|
Energy consumption class Ⅲ
|
No-load loss(kW) |
38 |
47 |
55 |
63 |
79 |
107 |
On-load loss(kW) |
248 |
308 |
364 |
418 |
520 |
705 |
|
Short-circuit impedance (%) |
HV-MV 10~11、HV-LV 24~26、MV-LV 12~14 |
||||||
Capacity assignment (%) |
100/100/30 |
||||||
Note:
The data in the above sheet are applicable to step-down type transformer. Step-up type transformer can be provided as required.
Short circuit impedance in the sheet is the value based on 100% rated capacity.
Transformers with various special parameters and performance can be manufactured according to customer requirements.
Normal Service Conditions
Altitude:≤1000m;
Ambient temperature:Maximum temperature: +40℃;Maximum monthly average temperature: +30℃;Maximum yearly average temperature: +20℃;Minimum temperature: -25℃.
Power supply: approximate sinusoidal wave, three-phase symmetrical approximately
Installation site: indoor or outdoor, without the obvious contamination.Note: The transformer used in special conditions should be specified when ordered.
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