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Three Phase Isolation Transformer

Three Phase Isolation Transformers are devices that decouple two circuits, the load to the isolation transformer and the input supply. They suppress electrical noise that occurs in transmission lines and blocks the transmission of DC signals from one circuit to another. They also prevent interference caused by ground loops.

Isolation transformers are constructed with two isolated Faraday shields between the primary and secondary windings. The use of two shields in the construction of the isolation transformer diverts high-frequency noise. The two shields provide more effective isolation of the primary and secondary circuits and also isolation to their grounds.

Advantages and Benefits

  • Very high noise attenuation capacity.
  • Reduced coupling capacitance.
  • Lesser leakage current.
  • Suitable for higher harmonic loads.
  • The core will not saturate even if the applied voltage is high.
  • Facilitate direct current power isolation
  • Ensure safety during testing and servicing
  • Enable Scalable build of units based on would coils.
System Connections Delta/Star
Input Voltage 415V 3 Phase
Output Voltage 415V or 200V 3 Phase
Ratios 1:1 and 2:1
Regulation Better than 3.5%
Power Factor 0.75 Lead or 0.75 Lag
Di-electric Strength 3KV for 60 sec
Insulation Resistance Better than 1000 Mega Ohms
Coupling Capacitance 0.1 PF for 8o db
Leakage Current Less than 20 Micro Amps
Common Mode Attenuation 80 db/100 db
Construction Standards As per IS 2026 Part I and II, IS 11171
Type of Execution Closed Type
Operating Temperature 0°C to 45' C
Type of Cooling Natural air / Forced air
Oil cooled (optional)


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  • CNC Machines
  • Garment Equipment
  • Large Computer Installations
  • Printing Machinery
  • Remote Control Equipment
  • Scientific Equipment
  • Textile Machinery
  • Telecommunication Equipment

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