7500kva Oil Immersed Transformer

•oil immersed transformer use ester oil is that it is not flammable, superior fire safety

•adopts Seven-step silicon steel lamination insulated on both sides, guaranteeing low losses and low noise

• Strong resistance to sudden short circuits

• High-Temperature Resistant Insulation System

• Waterproof, moisture-proof and salt spray-proof,

•Special design structure for seismic zones or for using in applications with high level vibrations.

•marine coating C5-M withstand the most extreme environmental condition, Prevent oil leakage technology

Main Specification
Transformer Type	Oil immersed
Rated capacity	up to 40mva
Rated voltage	up to 132kV
Frequency	50 or 60Hz
Phase	single phase or three phase
Winding material	Copper or Aluminum
Tap changer	Off-load or on-load
Insulation class	A, E, B
Vector group	Dyn11, YNd1d1, Yyn0, YNd11 etc.
Cooling	ONAN , ONAF, KNAN, KNAF etc.
Bushing	ceramic insulators or epoxy resin bushings
Insulation level	11KV BIL 95KV 22KV BIL 150KV 33KV BIL 200KV
Ambient temperature	-45°C + 60°C
Dielectric fluids	Mineral oil, Silicone, Vegetable Oil
Standard	IEC, AS, EN, IEEE/ANSI, GOST
Accessories	Bushing Oil level gauge Transformer tank pressure relief valve Tap changer Oil Thermometer Buchholz-Relay

7500kva distribution transformer

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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Oil Immersed Transformers