SFP / DSP / SSP 330–1000 kV generator step-up transformers for thermal, nuclear and hydro plants
SFP, DSP and SSP are generator step-up transformers of the 330, 500 and 1000 kV classes for thermal, nuclear and hydro power units rated 300–1000 MW. Single- and three-phase models have ODWF or OFAF cooling. For hydro plants with difficult access there is a version assembled on site.
- Single-phase 500 kV
- DSP-375000/500: 375 MVA, (550/√3 −2×2.5 %)/24 kV, ODWF, no-load loss ≤118 / short-circuit loss ≤582 kW
- Three-phase 500 kV
- SSP-JT-700000/500 (assembled on site); SSP-H-860000/500: three-phase bank 558 MVA, (550 ±5×2.5 %)/18 kV
- 330 kV
- SFP-450000/330: 450 MVA, 363/20 kV, OFAF, no-load 203 / short-circuit 880 kW
- 1000 kV
- single-phase 1000 kV generator transformers (Pingyu thermal plant)
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
Step-up transformers raise the voltage of thermal, nuclear and hydro generators to the grid voltage of 330, 500 and 1000 kV. By purpose they correspond to the ТДЦ, ОДЦ and ТЦ transformers for 300–1000 MW units. They have been supplied for 660 and 1000 MW coal-fired units at the Xiantao, Shenli, Kemen, Sanmenxia and Pingyu stations, for the Baihetan, Xiluodu and Jinping-II hydro plants and for projects abroad.
The single-phase DSP-375000/500, rated 375 MVA, with voltages of (550/√3 −2×2.5 %)/24 kV and vector group Ii0, was built for the Baihetan hydro plant, which has 1000 MW units. Cooling is forced-circulation oil-water (ODWF), so heating is low and overload capacity is high. Stray fields from large currents are suppressed by a set of measures, the windings are clamped by a powerful pressing system, and noise does not exceed 72 dB(A). No-load loss is up to 118 kW, short-circuit loss up to 582 kW and short-circuit voltage 17 %.
For hydro plants with difficult access there are two options. The SSP-JT-700000/500 is shipped disassembled and assembled on site using factory-grade vapour-phase drying. The three-phase bank SSP-H-860000/500, rated 558 MVA ((550 ±5×2.5 %)/18 kV, ODWF), consists of three single-phase parts, so its shipping dimensions are those of a single-phase transformer. Inter-phase fire walls are not needed, the LV windings are delta-connected internally, and the busducts are easier to connect. No-load loss is 199 kW and short-circuit loss 970 kW.
The three-phase SFP-450000/330, rated 450 MVA (363/20 kV, OFAF), was designed for a unit of a cogeneration plant. Its no-load loss is 203 kW, short-circuit loss 880 kW and short-circuit voltage 16 %; the design is compact and vibration is low. Separately, the manufacturer has built single-phase 1000 kV generator transformers, which operate at the Pingyu thermal plant.
Common to all models are high short-circuit withstand and mechanical strength, control of stray fields in large structures, a low level of partial discharge, and resistance to overexcitation and overloads. The transformers are installed in thermal, nuclear and hydro units and in plant start-up and standby schemes.
Technical specifications
| Single-phase 500 kV | DSP-375000/500: 375 MVA, (550/√3 −2×2.5 %)/24 kV, ODWF, no-load loss ≤118 / short-circuit loss ≤582 kW |
|---|---|
| Three-phase 500 kV | SSP-JT-700000/500 (assembled on site); SSP-H-860000/500: three-phase bank 558 MVA, (550 ±5×2.5 %)/18 kV |
| 330 kV | SFP-450000/330: 450 MVA, 363/20 kV, OFAF, no-load 203 / short-circuit 880 kW |
| 1000 kV | single-phase 1000 kV generator transformers (Pingyu thermal plant) |
| Cooling | ODWF, OFAF |
| Noise | ≤72–80 dB(A) |
| Vector group | YNd11, Ii0 |
Replacement for
ТДЦ-400000/330, ТЦ-630000/330, ТЦ-630000/500, ОРЦ-533000/500, ОРЦ-417000/750 (unit transformers); 1000 kV has no direct equivalent
selected by purpose and main parameters, please confirm with our manager
Request a price and lead time
SFP / DSP / SSP 330–1000 kV generator step-up transformers for thermal, nuclear and hydro plants. 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
What power units are the transformers intended for?
For thermal, nuclear and hydro units rated 300–1000 MW with a grid voltage of 330, 500 or 1000 kV. They have been supplied for 660 and 1000 MW coal-fired units and for the Baihetan hydro plant.
What are the parameters of the DSP-375000/500?
Rating 375 MVA, voltages (550/√3 −2×2.5 %)/24 kV, ODWF cooling. No-load loss up to 118 kW, short-circuit loss up to 582 kW, short-circuit voltage 17 %, noise up to 72 dB(A).
How can a transformer be delivered to a hydro plant with narrow access?
The SSP-JT-700000/500 is shipped in parts and assembled on site with vapour-phase drying. The SSP-H-860000/500 bank consists of three single-phase parts, each with the dimensions of a single-phase unit.
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