Oil immersed transformers

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Special Distribution Transformers

Cold-rolled grain-oriented metal sheets , step-lap core design
  • distribution transformer 2000kva
  • liquid filled transformer
  • oil filled transformer
  1. distribution transformer 2000kva
  2. liquid filled transformer
  3. oil filled transformer

Cold-rolled grain-oriented metal sheets , step-lap core design

Coating of tank and cover based on hydro-coating material by flooding or dipping method. (Standard RAL 7033)

Use vegetable oil is that it is not flammable, reducing the risk of fire

Oil immersed transformers designed and manufactured bespoke with top or side connections

Related product parameters


Main Specifications
Transformer typeoil immersed transformer
Capacity30-20mva
Voltageup to 36kv
Frequency50/60hz
CoolingONAN/ ONAF/ KNAN
Winding materialCopper/ Aluminum
Dielectric liquidMineral oil/ Vegatable oil/ FR3
CoolersCorrugated wall/ Panel Radiator 
Vector groupDyn11
StandardIEC60076/ ANSI
Installwithout fire, explosion danger, serious foul, chemical corrosion, or violent vibration. Indoor And outdoor.


Factory Test

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.


 Routine test

 a) Measurement of winding resistance

 b) Measurement of voltage ratio and check of phase displacement

 c) Measurement of short-circuit impedance and loss

 d) Measurement of no-load loss and current

 e) Dielectric routine tests

 f) Tests on on-load tap-changers, where appropriate

 g) Leak testing with pressure for liquid-immersed transformers(tightness test)

 h) Tightness tests and pressure tests for tanks for gas-filled transformers

 i) Check of the ratio and polarity of built-in current transformers


 Type test

 a) Temperature-rise type test

 b) Dielectric type tests

 c) Determination of sound level for each method of cooling for which a guaranteed sound level is specified

 d) Measurement of the power taken by the fan and liquid pump motors

 e) Measurement of no-load loss and current at 90% and 110% of rated voltage


 Special test

 a) Dielectric special tests

 b) Winding hot-spot temperature-rise measurement

 c) Determination of capacitances windings-to-earth, and between windings

 d) Measurement of dissipation factor(tanδ) of the insulation system capacitances

 e) Determination of transient voltage transfer characteristics

 f) Measurement of zero-sequence impedance(s) on three-phase transformers

 g) Short-circuit withstand test

 h) Measurement of d.c. insulation resistance each winding to earth and between windings

 i) Vacuum deflection test on liquid immersed transformers

 j) Pressure deflection test on liquid immersed transformers


Applications

Distribution Networks,Private Properties, Agriculture – Irrigation, GSM Base Stations, Industrial Buildings,coal mine

Packing

wooden case packing
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Contact us

Varelen Electric Co., Ltd

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