Oil-immersed power transformers and power plant step-up transformers (GSU) up to 1100 MVA, up to 800 kV
Oil-immersed power transformers for power plants and grids include generator step-up (GSU), substation (PTR) and distribution (DTR) types. According to the rating table of the range, the rating reaches 1100 MVA and the voltage 800 kV. Versions with a GIS connection and with non-flammable vegetable oil are available.
- Purpose
- generator step-up (GSU) transformers for power plants, step-down transformers for substations
- Ratings in the oil-immersed transformer range
- up to 1100 MVA, up to 800 kV (according to the table on the website of the manufacturer's US subsidiary)
- Examples
- 132/33 kV 90/125 MVA; 230 kV class transformers; 400 kV test transformer
- Windings
- disc with high series capacitance (HV), cylindrical layer and helical of transposed conductor (LV, high currents), multi-parallel tapping
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
The manufacturer produces oil-immersed power transformers for power plants and grids. The range includes generator step-up transformers (GSU), substation power transformers (PTR) and distribution transformers (DTR). The plants are located in Japan and Thailand. The rating table of the oil-immersed transformer range on the website of the manufacturer's US subsidiary states ratings up to 1100 MVA and voltages up to 800 kV. Examples include a 132/33 kV transformer rated 90/125 MVA, 230 kV class transformers and a 400 kV test transformer. In purpose they are close to 110–750 kV power transformers for power plants and substations.
The core is assembled from high-quality cold-rolled grain-oriented Hi-B steel without holes in the laminations and clamped with heat-treated plastic bands. This reduces no-load losses, magnetizing current, magnetostriction and noise, as well as mass and dimensions. The winding design is chosen for the purpose. For high voltage and protection against impulse overvoltages, a disc winding with high series capacitance is used, so potential oscillations along it during a lightning impulse are minimal. For low voltage and high currents, a cylindrical layer winding of transposed conductor or a helical winding is suitable, and for a wide regulation range, a multi-parallel cylindrical tapping winding. Transposed conductor reduces additional losses and local overheating, and magnetic shields on the inner tank wall and measures against magnetization of metal structures reduce stray losses.
The insulation of extra-high-voltage windings is designed with computer analysis of potential distribution. Before shipment, each such transformer passes a partial discharge test. The windings are wound and the active part is assembled in dust-free, air-conditioned rooms. The cooling system is chosen for the rating and site conditions; ONAN, ONAF, ODAN, ODAF and OFOW are available.
A standard transformer with an oil conservator is equipped with HV and LV bushings, an off-circuit tap changer, a Buchholz gas relay, a dehydrating breather, a pressure relief valve, a thermometer and an oil level gauge. Options include an OLTC, plug-in bushings, a rubber diaphragm in the conservator, a galvanized tank, a winding temperature indicator, fans, pumps and cable boxes. Special versions are possible, including direct connection to GIS, transportable fully assembled units, low-noise units, and units with non-flammable vegetable oil made from soybeans.
Technical specifications
| Purpose | generator step-up (GSU) transformers for power plants, step-down transformers for substations |
|---|---|
| Ratings in the oil-immersed transformer range | up to 1100 MVA, up to 800 kV (according to the table on the website of the manufacturer's US subsidiary) |
| Examples | 132/33 kV 90/125 MVA; 230 kV class transformers; 400 kV test transformer |
| Windings | disc with high series capacitance (HV), cylindrical layer and helical of transposed conductor (LV, high currents), multi-parallel tapping |
| Cooling | ONAN, ONAF, ODAN, ODAF, OFOW |
| Regulation | off-circuit tap changer (standard), OLTC (option) |
| Tank design | with conservator; options are a rubber diaphragm, a galvanized tank, cable entries, GIS connection |
| Testing | partial discharge measurement for extra-high-voltage transformers |
Replacement for
ТДЦ-125000/110, ТДЦ-250000/220, ТДЦ-400000/330, ТЦ-630000/500, ОРЦ-533000/500, ОРЦ-417000/750 (unit transformers); ТДН-16000/110, ТРДН-40000/110
selected by purpose and main parameters, please confirm with our manager
Request a price and lead time
Oil-immersed power transformers and power plant step-up transformers (GSU) up to 1100 MVA, up to 800 kV. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Questions and answers
What ratings and voltages are stated for the range of oil-immersed transformers?
According to the rating table of the range, the rating reaches 1100 MVA and the voltage 800 kV. Examples include a 132/33 kV transformer rated 90/125 MVA, 230 kV class transformers and a 400 kV test transformer.
What cooling systems are available for these transformers?
ONAN, ONAF, ODAN, ODAF and OFOW are available. The system is chosen for the transformer rating and site conditions.
Are extra-high-voltage transformers tested for partial discharges?
Yes, each extra-high-voltage transformer passes a partial discharge test before shipment. The insulation of such windings is designed in advance with computer analysis of potential distribution.
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