Transformers for offshore and onshore wind farms: platform 220–330 kV, low-frequency 20 Hz, nacelle and tower 35–66 kV
The wind power range covers platform step-up transformers of 220–330 kV rated 315–340 MVA, 20 Hz low-frequency units and 35–66 kV wind turbine transformers. Oil-immersed and dry-type models are installed in nacelles and towers of 13 and 16 MW turbines, on offshore platforms and at onshore wind farms.
- Platform
- SZ-340000/330 (340 MVA, (345 ±8×1.25 %)/66 kV); SSZ-315000/220 (315 MVA, 230/69/10.5 kV); ONAN
- Low-frequency 20 Hz
- SS-330000/220: 330 MVA, 230/66/10.5 kV
- Tower / nacelle oil-immersed
- SW(B)SP-F(H)-14400/69 (14.4 MVA, 69/1.14 kV, 13 MW turbines); SRBSPB-F(H)-17600/35 (17.6 MVA); SRESPB-F(H)-18000/66 (20 Hz, 16 MW turbines)
- Dry-type for turbines
- SCSFB-13200/69 (13.2 MVA, 69/1.14 kV, AFWF); SCSB-F-7400/35 (7.4 MVA, 35/0.69 kV)
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
The manufacturer makes a full range of transformers for wind power plants, from units in the turbine nacelle and tower to step-up transformers for offshore platforms. Its equipment operates at the Dafeng (300 MW), Yangjiang Shapa and Yuhuan-2 offshore wind farms, the latter being China's first offshore wind farm with reduced-frequency 20 Hz transmission.
The SZ-340000/330 step-up transformer, rated 340 MVA, has voltages of (345 ±8×1.25 %)/66 kV, vector group YNd11, ONAN cooling, no-load loss of 148 kW, short-circuit loss of 728 kW and noise of up to 69 dB(A). The three-winding SSZ-315000/220, rated 315 MVA (230/69/10.5 kV), takes the output of the wind turbines on the 66 kV side and steps it up to 220 kV for transmission ashore, while the 10.5 kV winding supplies the platform's auxiliary needs. Per the manufacturer, it has regulation of ±8×1.25 % on the HV side, a top-oil temperature rise of 54 K, an average winding temperature rise of 64 K and HV insulation of SI750 LI950 AC395. Both units are compact and lightweight, resistant to corrosion, seismic effects and short-circuit currents, hold overloads and need minimal maintenance.
The low-frequency SS-330000/220 (330 MVA, 230/66/10.5 kV, 20 Hz) was created for reduced-frequency AC transmission from distant offshore wind farms. The manufacturer studied the behaviour of electrical steel and the load characteristics at 20 Hz and kept mass and dimensions in check despite the very high short-circuit impedance between windings.
Wind turbine transformers raise the generator voltage of 690 or 1140 V to the voltage of the plant's internal network. The oil-immersed tower and nacelle models include the SW(B)SP-F(H)-14400/69 (14.4 MVA, 69/1.14 kV) for 13 MW turbines, the SRBSPB-F(H)-17600/35 (17.6 MVA, 36.75/1.14 kV) and the low-frequency SRESPB-F(H)-18000/66 for 16 MW turbines. They are vibration- and explosion-resistant and have high overload capacity.
The dry-type nacelle SCSFB-13200/69 (13.2 MVA, 69/1.14 kV) is cooled by the AFWF scheme, with a temperature rise of up to 125 K. The tower SCSB-F-7400/35 (7.4 MVA, 35/0.69 kV, Dy11y11) became the first dry-type transformer for offshore turbine towers to be connected to the grid. The dry-type models have C5-VH corrosion protection, climatic class C4, environmental class E4 and fire class F1. A dry-type nacelle transformer for 35 kV is made for onshore wind farms.
Technical specifications
| Platform | SZ-340000/330 (340 MVA, (345 ±8×1.25 %)/66 kV); SSZ-315000/220 (315 MVA, 230/69/10.5 kV); ONAN |
|---|---|
| Low-frequency 20 Hz | SS-330000/220: 330 MVA, 230/66/10.5 kV |
| Tower / nacelle oil-immersed | SW(B)SP-F(H)-14400/69 (14.4 MVA, 69/1.14 kV, 13 MW turbines); SRBSPB-F(H)-17600/35 (17.6 MVA); SRESPB-F(H)-18000/66 (20 Hz, 16 MW turbines) |
| Dry-type for turbines | SCSFB-13200/69 (13.2 MVA, 69/1.14 kV, AFWF); SCSB-F-7400/35 (7.4 MVA, 35/0.69 kV) |
| Protection | corrosion protection up to C5-VH, climate C4, environment E4, fire class F1 (dry-type) |
| Losses (example) | SZ-340000/330: no-load 148 kW, short-circuit 728 kW |
Replacement for
ТРДЦН-160000/220, ТДЦ-250000/220 (general type); 35 kV tower units, ТМГ-…/35; offshore platform, 20 Hz and nacelle units have no direct equivalent
selected by purpose and main parameters, please confirm with our manager
Request a price and lead time
Transformers for offshore and onshore wind farms: platform 220–330 kV, low-frequency 20 Hz, nacelle and tower 35–66 kV. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Customs codes
| UKTZED (Ukraine) | 8504 23 00 00 |
|---|---|
| HS, 6 digits | 8504 23 |
| CN (EU) | 8504 23 00 |
| HTSUS (USA) | 8504 23 00 80 |
| China customs tariff | 8504 23 10 00 8504 23 20 00 |
Codes are for reference: the final code is determined at declaration for the specific model.
Questions and answers
Which transformers are offered for offshore platforms?
The SZ-340000/330 rated 340 MVA with voltages of (345 ±8×1.25 %)/66 kV and the three-winding SSZ-315000/220 rated 315 MVA with voltages of 230/69/10.5 kV. Both have ONAN cooling.
Are there transformers for reduced-frequency transmission?
Yes, the SS-330000/220 rated 330 MVA is designed for 20 Hz, with voltages of 230/66/10.5 kV. For 16 MW turbines there is the low-frequency SRESPB-F(H)-18000/66.
What is the design of the dry-type transformers for turbine towers?
The SCSB-F-7400/35 rated 7.4 MVA has voltages of 35/0.69 kV and connection Dy11y11. The dry-type models have C5-VH corrosion protection, climatic class C4, environmental class E4 and fire class F1.
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