TORc / TOc — oil-immersed power transformers 2.5–80 MVA, 6–132 kV
Power transformers of the TORc (with on-load tap changing), TOTRc (three-winding with OLTC) and TOc (with off-circuit tap changing) series are intended primarily for HV/MV step-down substations — the main supply points of distribution networks — and also for
- Power
- 2.5–80 MVA
- HV voltage
- 6–132 kV (incl. 110, 115, 121 kV)
- Voltage regulation
- on-load tap changer (TORc, TOTRc) or off-load tap changer (TOc); OLTC ±10…±16 %, up to 12 steps
- Versions
- two-winding and three-winding (TOTRc)
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
Power transformers of the TORc (with on-load tap changing), TOTRc (three-winding with OLTC) and TOc (with off-circuit tap changing) series are intended primarily for HV/MV step-down substations — the main supply points of distribution networks — and also for unit operation at CHP plants and wind farms, where the transformer raises the generator voltage to the HV network level. MV/MV interconnection transformers are also produced. The range covers powers from 2.5 to 80 MVA and voltages from 6 to 132 kV. Published examples include units of 4–80 MVA for 115/16.5 kV, 115/6.3 kV, 121/10.5 kV, 31.5/6.3 kV and other combinations; three-winding TOTRc units are produced up to 50 MVA with connections YNd11d11, YNy0d11 and Yy0y0. The OLTC regulation range is ±10…±16 % with up to 12 steps; for the off-circuit switch it is usually ±2×2.5 %. The peak efficiency index PEI for the range is from 99.465 % to 99.723 %, which meets the requirements of Commission Regulation (EU) No 548/2014. Design. The three-limb core is stacked from cold-rolled low-loss electrical steel, with a stepped limb cross-section approximating a circle and step-lap joints, which reduces no-load losses and noise. The windings are of electrolytic copper in paper insulation, made from several parallel conductors. The built-in OLTC on the HV side has a motor drive 3×400/230 V with local, remote and manual control and a position indicator. The tank without additional fittings withstands a pressure difference of ±500 hPa; single- or double-chamber conservator, removable radiators (galvanised or painted), trolley with 1505 mm gauge or skids. Equipment: Buchholz gas relay, OLTC pressure relay, magnetic oil level gauges, air dryers, contact and resistance thermometers, pressure relief valve, terminal box. Versions to other customer standards are possible. The plant also repairs and modernises transformers up to 80 MVA and 121 kV. Standards: PN-EN 60076-1, -2, -3, -8, -10, PN-EN 60296.
Technical specifications
| Power | 2.5–80 MVA |
|---|---|
| HV voltage | 6–132 kV (incl. 110, 115, 121 kV) |
| Voltage regulation | on-load tap changer (TORc, TOTRc) or off-load tap changer (TOc); OLTC ±10…±16 %, up to 12 steps |
| Versions | two-winding and three-winding (TOTRc) |
| Cooling | oil-immersed, external radiators |
| OLTC drive | motor-driven 3×400/230 V, 50 Hz, local/remote control |
| PEI index | 99.465–99.723 % (by range) |
| Tank | withstands ±500 hPa |
| Frequency | 50 Hz |
| Standards | PN-EN 60076-1/-2/-3/-8/-10, PN-EN 60296, Regulation (EU) 548/2014 |
Replacement for
ТМН-2500/35, ТМН-6300/35, ТД-10000/35, ТДН-16000/110, ТРДН-40000/110, ТРДЦН-63000/110
selected by purpose and main parameters, please confirm with our manager
Request a price and lead time
TORc / TOc — oil-immersed power transformers 2.5–80 MVA, 6–132 kV. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
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