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Oil Immersed Transformers

Oil Immersed Transformers

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Liquid Immersed Transformer

  • •oil immersed transformer use ester oil is that it is not flammable, superior fire safety
  • •Strong resistance to short circuits
  • •COMPACT design
  • •largely reduce non-load losses by adopting amorphous or high quality silicon steel core,
  • •High temperature resistance insulation  system
  • •Efficient transformer with reduced losses
  • •The Tank withstanding pressure up to 115kPA  comply with FM3990 requirements
  • • the transformer tank must stay securely sealed, enduring mechanical strain and remaining unaffected by wind or weather conditions
  • •Surface protection hot-dip galvanization can be request
Liquid Immersed Transformer

Why choose Varelen oil immersed transformer? Safe and environmental friendly transformers

1. Magnetic Core

The three-limb iron core is made of oblique cut Grain-oriented, seven-step silicon steel lamination insulated on both sides, guaranteeing low losses and low noise.  It is protected on the surface with a flash-proof varnish in order to prevent the sheet from corrosion and to reduce the noise.

 

2. Transformer 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. Painting and surface treatment

oil Immersed Transformers colour is  RAL 7033. Transformer tanks are painted by the method of dipping or spraying.  and offer anti-corrosion paint C5, also can supply (zinc coating) according to the customer requirements.  tried-and-tested surfact treatment depending on the application environment and transformer installation site.

 

The Tank

The tank, cover and conservator are made of steel plates.Double welding is used where oil tightness is required. Rubberor cork rubber compound is used for the gasket on flangedconnections.The transformer tank usually has removableradiators connected by shut-off valves. All tanks are subjected to leak tests.

feature of hermetically sealed transformers

 

 

 

 

 

 

For each transformer are prepared and issued a test report, in accordance with IEC 60076. except for routine tests, we also offer type tests and specialized tests to meet all customer requirements. We make what matters work for our customers in a safe and reliable way.

 

Varelen has launched online FAT plan for customers. Our factory can make acceptance testing ( either witnessed and on-line) in order to show all technical and quality requirements have been done before shipment.

oil immersed transformer testing

Routine test

  •  Measurement of winding resistance
  •  Measurement of voltage ratio and check of phase displacement
  •  Measurement of short-circuit impedance and loss
  •  Measurement of no-load loss and current
  •  Dielectric routine tests
  •  Tests on on-load tap-changers, where appropriate
  •  Leak testing with pressure for liquid-immersed transformers(tightness test)
  •  Tightness tests and pressure tests for tanks for gas-filled transformers
  •  Check of the ratio and polarity of built-in current transformers
  •  Check of core and frame insulation for liquid immersed transformers with core or frame insulation

 Type test

  •  Temperature-rise type test
  •  Dielectric type tests
  •  Determination of sound level for each method of cooling for which a guaranteed sound level is specified
  •  Measurement of the power taken by the fan and liquid pump motors
  •  Measurement of no-load loss and current at 90% and 110% of rated voltage

 Special Test

  •  Dielectric special tests
  •  Winding hot-spot temperature-rise measurement
  •  Determination of capacitances windings-to-earth, and between windings
  •  Measurement of dissipation factor(tanδ) of the insulation system capacitances
  •  Determination of transient voltage transfer characteristics
  •  Measurement of zero-sequence impedance(s) on three-phase transformers
  •  Short-circuit withstand test
  •  Measurement of d.c. insulation resistance each winding to earth and between windings
  •  Vacuum deflection test on liquid immersed transformers
  •  Pressure deflection test on liquid immersed transformers
  •  Vacuum tightness test on site on liquid immersed transformers

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Areas of application

 VARELEN offers a complete range of distribution transformers designed to grant the reliability, durability, and effciency required in utility, pulp and paper, metal and mining, oil& gas, industrial and commercial applications, Our oil-immersed transformers are manufactured in accordance withthe most demanding industry and international standards.

Brochure downloads

oil immersed transformer catalog
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Do you need a quote for any of our products orsolutions? Do you have a technical question? You cancontact us 24/7.

Frequently Asked Questions

1.Whats the insulation class of oil immersed transformer?

Insulation class:  A（105℃）， E (120℃）,  B（130℃）

2. What types of insulating oil are used?

Fluid options available，Mineral Oil , Natural Ester Fluid (FR3 fluid), Silicone , Midel etc.

Contact information

Emailsales@varelen.com Tel+86 19373185639 Fax+86 731 84371029 Phone/WeChat+86 19373185639

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