Varelen Electric Co., Ltd

Phase shift rectifier transformer

Improved construction, compact size, superior reliability

Phase shift rectifier transformer
VPI dry type transformer
phase shift transformer
Multi pulse transformer
Multi phase transformer

Related product parameters

Main Specifications
Type dry type
Phase three phase
Frequency 50/ 60Hz
Rated Capacity 250 to 10000kVA
Rated HV 3kV to 13.8kV
Rated LV 3kV to 10kV
Temperature Rise 125K
Cooling Mode AN / AF
Insulation Class H
Winding Connection Code Y/E/yn
Impendance 6- 9%
Secondary Windings Available 6, 9, 12, 15, 18, 21, 24, 27, 36 windings
Maximum temperature +40℃
Minimum temperature -25℃
Altitude 1000M


Providing the multi-phase rectifier power to middle and high voltage inverter, playing a multiple role of isolation and phase shifting, mainly used in boiler fan in power plant, water supply system and metallurgy, chemical industry and municipal engineering of automated control system.



Excellent structure, small size and high reliability:
1. With electromagnetic and structural optimization design, small size and lower noise;
2. Same mold windings, special support structure for coil end surface, high strength mechanical, high ability of withstand short-circuit, safe and reliable;
3. Maintenance-free fastening body structure, keep reliable in the long-distance transport and operation
4. Lead lays out neatly, reasonable and nice.

High-quality material and good performance:
1. Made of Class C Dupont insulation materials with big running temperature rise margin, strong overload capacity, high fire resistance, good thermal stability and long service life.
2. Adopted vacuum pressure impregnation Class C  with UL insulating paint to ensure moisture proof, dust-proof, anti-contamination and low partial discharge.
3. With high-quality core made of silicon steel sheet and high-quality oxygen-free copper wire to reduce the effective operation loss and improve efficiency.

Good solution to harmonic influence:
1. Made of high-performance silicon steel sheet material and lower magnetic flux density design so as to withstand over-voltage and harmonic influence unsaturated.     
2. Lower current density design and sufficient margin to make winding withstand additional temperature rise caused by harmonic.
3. Advanced insulation structure that can withstand a variety of over-load insulation impact.
4. Reaching up to maximum 27 phase for secondary winding in result a great reduction of the harmonics influence on the power grid and other equipment.


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     

  •  Measurement of winding resistance      
  •  Measurement of voltage ratio and check of phase  displacement 
  •   Measurement of short-circuit impedance and load loss
  •  Measurement of no-load loss and current      
  •  Separate-source AC withstand voltage test     
  •  Induced AC withstand voltage test    
  •  Partial discharge measurement

    Type test           

  •  Partial discharge measurement   
  •   Temperature-rise test    

    Special test  

  •   Lightning impulse test      
  •   Measurement of sound level          
  •   Short-circuit test       

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