With Putuo Large Oil Immersed Distribution transformers, you obtain not only the transformer but also an Energy Partner for your business

• Excellent short-circuit resistance
• Satisfies the various load conditions required by customers
• Low-loss step lap laminated core
• Uses latest insulation material with high short-circuit strength to realize high thermal capacity
• Cold steel sheet is used for radiating pipe to ensure a sufficient cooling effect and aesthetic exterior
• Compact, light, and low-noise transformer with standard efficiency and noise level which can be easily installed even in a small indoor or outdoor area

Latest developments: Expandingthe portfolio

Putuo Electric introduces FreeCombination™Technologythat combines various types of transformer production into one united mechanism to improve production efficiency, stabilize product quality, and enhance product performance.

All these transformers can be designed, customized, and supplied with a wide variety of accessories, as required.

Putuo Large Oil Immersed Distribution transformers are able to reach 25 MVA and operating voltages of up to 40.5 kV. This product offers individual solutions for satisfying requirements related to types of operation, low noise and low losses, connection technology, type of cooling, transportation and so on.

01 Windings
Windings are composed of two parts, namely, a conductor and insulation material. For the conductor, Hyosung uses high grade electrolytic copper or aluminium. Putuo Oil immersed transformers obtain high thermal capacity with the use of Epoxy coated Insuldur Kraft Paper, which has higher short time overload capacity than any other Kraft paper type.

02 Core
Core design is essential because it determines the transformer’s efficiency and noise level. For high dimensional accuracy, the core cutting processing of Hyosung is controlled by a computerized system. By Step-Lap core stacking, Hyosung Oil immersed transformers attain to optimal characteristics for each customer.

03 Winding Support System
Coils are sized and clamped by being pressed with a special hydraulic fixture after assembly with the core. With Axial and Radial direction, we reinforce the winding support system. This secure structure helps withstand harsh short circuit forces.

04 Radiator
The transformer will be furnished with panel or corrugated radiators assuring that the temperature rise of the windings or oil will not exceed their specified limit when the transformer continuously operates at the rated full load.

Design options

• Reduced loss transformers
• Low voltage transformers
• Reduced temperature rise
• Multiple primary voltage
• Multiple secondary windings
• Multi winding transformers (2, 3, 4, or 5 on the same core)
• Encapsulated low voltage windings
• Impregnated high voltage windings
• Different location of high and low voltage connection terminals: top and bottom, both on the same side
• Special connection groups
• Variable speed drives (VSD), rectifiers, and excitation transformers for 6, 12, 18, and 24 pulses
• Different coupling factors from 0.15 up to 0.9
• Earthing transformers
• Seismic and vibration reinforcement system
• Outdoor operation
• Offshore applications
• Reduced footprint
• Temperature monitor
• Antivibration pads
• Space heaters
• Painting colour

Accessories

• Fixed corrugated heat sink / removable heat sink (optional)
• Lightning arrester on high voltage bushing
• Oil temperature indicator
• Winding temperature indicator
• Oil level indicator
• Buchholz relay
• Pressure relief device
• Sudden pressure relay
• Thermometer pocket
• On load tap-changers (OLTC)
• Skid base or bi-directional rollers
• Cooling fan and fan control panel
• Various oil preservation system
• Current transformers on primary and secondary windings
• Special packings
• Hydrocoolers
• Cable boxes
• Containerized solutions
• ※ Other accessories are available upon request