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Varelen Electric Co., Ltd.

Oil Immersed Power Transformer, Three Phase Transformer, Tube Output Transformer manufacturer / supplier in China, offering Large Type Power Transformer Made in China, 16kVA Single Phase Pole Mounted Oil Immersed Transformer, 500 kVA 11kv Epoxy Resin Cast Dry-Type Power Transformers and so on.

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Supplier Homepage Product Three-phase oil immersed type transformer Large Type Power Transformer Made in China

Large Type Power Transformer Made in China

FOB Price: US $5,000-30,000 / Piece
Min. Order: 2 Pieces
Min. Order FOB Price
2 Pieces US $5,000-30,000/ Piece
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Port: Shanghai, China
Production Capacity: 100units/Month
Payment Terms: L/C, T/T, Western Union, Paypal, Money Gram

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Basic Info
  • Application: Power, Electronic, Instrument, Lighting, Rectifier
  • Core: Core-type Transformer
  • Winding Type: Two-winding Transformer
  • Usage: Power Transformer
  • Shape of Core: U
  • Rated Capacity: 30-3200kVA
  • Name: Oil Transformer
  • Specification: copper winding
  • Phase: Three
  • Cooling Method: Onan
  • Certification: ISO9001-2000, UL, ISO9001, CCC, Ce
  • Frequency Characteristics: Power Frequency
  • Brand: Varelen
  • Input Voltage: 11kv/10.5kv/10kv/6.3kv/6kv
  • Transport Package: Plastic Bag
  • Origin: China
Product Description
 Product overview
As a ISO9001:2008 certified corporation, Huarui offers a complete range of power and distribution transformers designed to grant the reliability, durability, and efficiency required' in utility, industrial,
and commercial applications. Our oil-immersed transformers are manufactured in accordance with the most demanding industry and international standards. Transformers can be used for indoor or outdoor applications and can be provided with off-load and on-load tap changers.
Standard Features Product Range:5kVA-31500kVA, up to 132kVSystem voltage: max. 132kVCoolers: corrugated wall or radiatorOil preservation: hermetically sealed or conservator/free breathingTap changer: off-load on-loadCooling medium: mineral oil, vegetation oilWinding materials aluminum or copper Low noise solutionEfficient transformers with reduced lossesSophisticated facilitiesUsage of wooden case3D package for drawingsCooling: ONAN/ONAFStandard: IEC60076
Service condition 
a) Suitable for indoor or outdoor application
b)Air temperature: Maximum temperature: +40ºC; Minimum temperature:-30ºC
Humidity: Monthly average humidity 95%; Daily average humidity 90% .
Altitude above sea level: ≤1000m.
e)Max wind speed:35M/s
Ambient air not apparently polluted by corrosive and flammable gas, vapor etc.
No frequent violent shake
Note: * Beyond those services condition should enquiry to manufacturer technical dept during order
 Tests Insulation resistance Resistance of all windings Check voltage ratio and vector group No load test at rated frequency and rated voltage Impedance test Withstand voltage test Induced over-voltage withstand test Partial discharge measurement Oil leakage test 
 Custom work- in macrocosm and in microcosm
The iron core
  Whether in design, manufacturing methods or materials the cores of Huarui transformers represent the latest state of technology. The silicon alloyed electric sheet steel used is grain-oriented, cold-rolled and insulated on both sides, guaranteeing low losses and noise and these values are even improved by laser treatment. Numerically controlled cutting machines provide for careful treatment in the cutting process in order to avoid mechanical tension in the core and thus unwanted properties right from the beginning. Standard use of step-lap cutting additionally minimizes losses and noise.
 2. The winding
 The winding as the centerpiece of the transformer must be especially protected - both against high electrical stress due to external over voltages and against mechanical overloads by short circuits. Huarui transformers are systematically designed to meet these requirements. The windings are made of copper or aluminum. Low-voltage windings are made of strip or flat wire, and the high voltage windings are manufactured from round or profile wire. ("diamond-dotted paper") bonds the winding into a compact block while drying and increases the short-circuit capacity additionally.
 3. The Tank
 Whether during transport or operation -the tank must be absolutely tight under mechanical stress. Preconditions to achieve this are constructional experience, the most modern calculation methods and high-quality welding work. Special attention is paid to corrosion protection. Pretreatment of the surface by
sandblasting contributes to corrosion protection, just like multi coating with preset drying times for each layer. On request, hot-dip galvanization provides for even better protection. The tank must dissipate the entire heat loss of the transformer into the ambient air. This makes the volume of the transformer fluid change. In hermetically sealed transformers, the corrugated walls absorb the change in volume. In the case of expansion tank transformers, the conservator compensates this change. The sheet-steel lids of Huarui transformers are bolted together with the tank - or welded on request. In any case the steel thickness and the bracing is dimensioned in such a way that the lid withstands the stress of transport and operation.

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