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Special Application Transformer


Special Application Transformers

1. Earthing Transformers


Introducing Earthing (or Grounding) Transformers, the cornerstone of optimized substation system design. Engineered with precision and reliability in mind, these transformers redefine the standards for efficient grounding solutions. Explore the key features that make Earthing Transformers the preferred choice for engineers and power system professionals. Earthing (or grounding) transformers are used specifically for electrical systems where the neutral point is unavailable. It provides an artificial neutral with a low-impedance return path for the line-to-ground fault current and limits over-voltage during fault conditions. Earthing transformers are designed to meet specific customer requirements. The following describes the general product features and performance factors for earthing transformers. earthing transformers are generally available in various voltages and ratings and are suitable for multiple commercial and industrial applications. A separate neutral grounding resistor can be provided. Please contact for additional product information specific to your application.

Technical Data:


Solidly Grounded

Provides a low-impedance path for fault currents to the ground.

Reactance Grounded

Incorporates a reactor in series with the neutral grounding, balancing fault current limitation and system stability.

Tailored for Different Voltage Systems

Earthing Transformers are designed to meet the specific requirements of various voltage systems and substations, ensuring optimal performance across diverse applications.

Fault Current Limitation

Limit fault currents during ground faults, safeguarding equipment from thermal and mechanical stress. Enables proper fault detection and ensures quick isolation for system stability.

Robust Construction

Earthing Transformers are built to withstand harsh environmental conditions, ensuring reliable performance. Simplifies installation and maintenance, providing a durable solution for substation grounding.

Resistor Grounded

Includes a series resistor to limit fault currents and reduce stress on the power system during a fault.

Zigzag Grounding

Special winding configuration for low-impedance zero-sequence current paths.

Enhanced System Safety

Provides a low-impedance path for fault currents, minimizing the risk of high voltages during ground faults. Prevents electrical shocks and minimizes equipment damage, enhancing overall system safety.

Flexible Neutral Grounding Methods

The design accommodates different neutral grounding methods, including solid grounding, resistance grounding, and reactance grounding. Adapts to varying fault current levels, system requirements, and operational considerations.

2. Auto Transformers


An autotransformer is an oil-immersed transformer with only one winding and a single coil acting alone; portions of the same winding act as the transformer’s primary and secondary winding sides. Autotransformers are designed to meet specific customer requirements. The following describes the general product features and performance factors for autotransformers. autotransformers are generally available in single- and three-phase configurations in various voltages and ratings suitable for multiple commercial and industrial applications.


Variable Voltage Adjustment

The autotransformer’s single winding can be tapped at multiple points, providing a range of turn ratios for variable output voltage. This flexibility suits various applications, including step-up and step-down transformations.

Compact and Lightweight

With its single-winding construction, the autotransformer is significantly smaller and lighter than isolation transformers of comparable capacity. Since part of the winding does “double duty,” autotransformers often have the advantage of being smaller, lighter, and cost-optimized, with lower leakage reactance, losses, and excitation current. This compact profile allows for discreet installations without compromising performance.

High Efficiency

Compared to traditional two-winding transformers, the autotransformer exhibits higher efficiency. It requires less excitation current and low losses, contributing to energy savings and reduced operational costs.

Cost-Effective Design

The autotransformer is a cost-effective alternative to conventional double-wound transformers. Its single winding results in a smaller footprint and reduced material requirements, making it an efficient and economical choice.

Enhanced Voltage Regulation

The autotransformer boasts superior voltage regulation due to minimized voltage drop in the single winding’s resistance and reactance. This results in a more stable and reliable voltage output.

Versatile Applications

The autotransformer finds applications in various scenarios, such as compensating voltage drops, starting motors, serving industrial machinery, and acting as a variac in laboratory setups.

Efficient Motor Starting

It excels in reduced-voltage motor starting, significantly reducing current through motor windings, and easing the load on power distribution circuits during startup.