An isolation transformer is an AC transformer where the primary and secondary windings are magnetically coupled but electrically isolated, typically with a 1:1 turn ratio
Unlike standard power transformers, its main function is not voltage change but galvanic isolation, which prevents direct electrical current flow between circuits. This ensures that the secondary circuit can operate independently of the primary, providing protection against electric shock and reducing interference.
3 Phase Electrical Power Isolation Transformer
A 3 phase transformer, there is a three-legged iron core as shown below. Each leg has a respective primary and secondary winding. Thus a 3 phase isolation transformers is a 3 phase transformer which has isolated primary and secondary windings to allow the power input to be isolated from the power output.
Photo
Standard 3 Phase Isolation Transformers
3 phase isolation transformers have 3 Primary and 3 secondary windings that are physically separated from each other. Sometimes these isolation transformers are referred to as “insulated”. This is because the windings are insulated from each other. In a 3 phase isolation transformer the output windings will be isolated, or floating from earth ground unless bonded at the time of installation.
Specification
Rating: single phase/ three phase
Type: dry type or oil cooled
Application: Indoor/outdoor
Range: Up to 1000KVA
Input voltage: 380V,415V,440V,480V,660V or as per customer requirement as per customer requirement
Output voltage: 220V,230V,415V,440V,480V,660V or as per customer requirement as per customer requirement
Frequency: 50 / 60 Hz
Vector group: Dyn11 / Dyn5 or as per customer requirement
Protection index: IP00 max IP54 or as per customer requirement
Insulation class: F / H
Ambient temperature: Max. 50 Degc
Efficiency: 90 to 99 % (over a range of capacity)
Reference Standards: IS2026 / IS11171
Features
Electrical safety: Protects users and equipment from electrical shocks
Noise and interference reduction: Blocks high-frequency electrical noise and prevents ground loops
Equipment protection: Shields sensitive electronics from voltage spikes, surges, and transients
Power quality improvement: Ensures stable AC power for delicate medical, audio, or laboratory equipment
Protect from damage or interface caused by electrical noise and spikes
High insulation resistance
Long-lasting hassle free performance
Required less maintenance
Economical cost
Easy to operate
We are the, manufacturers, suppliers and exporters of isolation transformer. We offer our complete range up to 630 KVA of goods at reasonable market price. These are specially designed to protect equipment from any damage or interface caused by electrical noise and spikes during operation.
General Purpose Isolation transformers
General Purpose Isolation transformers are used to lower distribution voltages (up to 750V) to lower voltages for power distribution within commercial or industrial buildings. These “two windings” transformers provide the electrical isolation required, and allow for short runs of high current, low voltage cables, reducing losses in the system, and reducing costs.
General Purpose Isolation transformer are suitable for supplying the following type of loads
General purpose lighting & electrical
Motors (without VFD controllers)
Resistive Heating
Drive Isolation Transformers
Drive Isolation Transformers are designed for supplying power to SCR (Silicon Control Rectifier) motor drives which provide convenient variable speed motor control and can save on energy.
A Drive Isolation Transformer (DIT) is designed specifically to supply power to VFDs. The isolation between the primary and secondary provides electrical isolation between the supply and the load. The transformer core is designed to handle the harmonic voltage without saturating, and the coils are braced to handle the mechanical forces that are introduced due to these harmonic currents. The coils are also designed to mitigate the impact of the harmonic currents. The winding conductors are selected and designed to keep eddy and stray losses to a minimum and the sufficient cooling is provided to dissipate the additional heat generated by the harmonic current.
Construction
Core and coil assemblies are mounted on isolation pads to reduce noise.
Bolted coil terminations suitable for copper or aluminum cables.
Front & back covers are easily removable for service.
Up to IP54 steel enclosures are available with paint / powder coating having lifting and wheel arrangement. MS or Stainless Steel enclosures are optional.
CE Certified
Qualified to the seismic requirements
Copper (Cu) or Aluminum (Al) windings
Copper / Aluminum / GI grounding strap
Accessible mounting flanges with front/back slotted mounting holes make installation easier
100% Factory tested for shorts and coil integrity, current and loss, voltage, impedance and noise.
Clear, Comprehensive Documentation and labelling
Separated windings
With more severe requirements on test voltages and creep age distance and clearance in air because these transformers are often exposed to overvoltage.
Input-side matching taps.
Additional clamp type terminal on request.
High-grade, vacuum impregnation in polyester impregnating resin.
Special versions available on request.
Standards: IS 2026, IEC 60726 & IEC 60076.