Power Transformers

A power transformer is a static electrical device that transfers electrical energy between circuits via electromagnetic induction. It uses primary and secondary windings around a magnetic core to change voltage levels - stepping voltage up for high-voltage transmission or stepping it down for distribution and end use. Power transformers operate above 33 kV and are foundational to every electricity grid.

Power transformers sit at the critical junctions of every modern power grid. They take electrical power generated at one primary voltage, raise it to high-voltage transmission levels for transport across transmission lines, then step it back down through electrical distribution systems for industrial, commercial, and residential supply. Without them, a reliable electricity supply over any meaningful distance is not possible - the energy losses across the wire would make it uneconomic. Choosing the right unit and maintaining it correctly is foundational to the long-term performance of any electrical system.

A power transformer works on electromagnetic induction. Alternating current flowing through the primary winding creates a changing magnetic field in the core. That magnetic field induces a voltage in the secondary winding. The turns ratio between primary and secondary windings determines the voltage transformation - more secondary turns step up the voltage, fewer secondary turns step it down.

Power transformers are important components driving the future of diverse sectors where a durable power supply is essential to their operations. Ampcontrol’s oil-filled power transformers are present across multiple electricity networks, power grids, and transport systems in Australia, providing many different sectors with electrical energy distribution. We also support mine sites, manufacturing facilities, processing plants, office buildings, and tunnelling projects.  

High-voltage power transformers are foundational to the future of your site. Used at power generation sites, they elevate voltage levels, a step for transmitting electricity across vast distances with minimal energy loss.       

By stepping up the voltage, these assets reduce the electrical current in transmission lines. This actively lowers the heat generated and the energy lost to resistance, making the entire power transmission process more efficient. Investing in high-quality transformers is a strategic approach that ensures stable, future-focused power delivery for your operations.

The four standard classifications are step-up transformers (raise voltage at generation sites), step-down transformers (lower voltage for end use), isolation transformers (electrically isolate two circuits while passing power), and auto transformers (single shared winding for high-efficiency voltage transformation). Power transformers, distribution transformers and current transformers are deployment categories built from these four operating types.