Oil Filled transformer conservator

•Oil immersed conservator transformer, adjust Temperature and oil volume
•Vector group Dyn11，Reduce the influence of harmonics on power grid and improve the quality of power supply
•Low noise, low partial discharge, low temperature rise
•Sealed Design: hermetically sealed transformers is their sealed enclosure.
•Stable electrical performance with a high resistant insulation system
•7-step stepping lap iron core structure, with low loss
•High-Temperature Resistant Insulation System

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.

4. The Tank

The tank, cover and conservator are made of steel plates. Double welding is used where oil tightness is required. The transformer tank usually has removable radiators connected by shut-off valves. All tanks are subjected to leak tests.

Whether during transport or operation, the tank must remain sealed tight under mechanical stress and regardless of wind or weather. Corrosion protection is especially important. The surface is sandblasted and then multicoated. as request, hot-dip galvanization can provide even better protection.

5. Oil Conservator

The conservator and external cover of the transformer are connected through a suitable pipe with an oil gauge attached to it. In addition, the conveyor and the case are detachable, if needed, as they are assembled by bolts.

Main Specification
Transformer Type	Oil immersed transformer with conservator
Rated capacity	Up to 40MVA
Rated voltage	Up to 66kV
Frequency	50 or 60Hz
Phase	single phase or 3 Phase
Winding material	Copper or Aluminum
Tapping	off-load and on-load
Winding temperature rise	65K
Vector group	Dyn11 Dyn5 Yyn0
Cooling	ONAN, ONAF, KNAN, KNAF
ONAN ONAF	A（105℃）， E (120℃）, B（130℃）
Dielectric liquid	Mineral oil, Vegatable oil , Silicone
Standard	IEC, AS, EN, IEEE/ANSI, GOST
Accessories	Bushing oil level gauge transformer tank pressure relief valve Tap changer Oil Thermometer Buchholz-Relay Lifting lugs

transformer for paper industry

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 specialised tests to meet all customer requirements. We make what matters work for our customers in a safe and reliable way.

hermetically sealed transformer with conservator

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
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.