Tap-changers and switches

Tap-changers are used to change the turn ratio between windings in a transformer. This ratio determines the voltage ratio between the windings and is essential for the stabilization of network voltage under variable load conditions. This adjustment may be made by an on-load tap-changer, or by a de-energized tap-changer, or by the selection of bolted link positions.

Hitachi ABB Power Grids offers a comprehensive portfolio of on-load tap-changers both the conventional and vacuum type, for high voltage and low voltage regulation, in in-tank and on-tank solutions. Our offering includes a wide range of de-energized tap-changers.

• Over 100 years of tap-changer manufacturing experience
• Proven solutions with decades of successful field operation 
• Serving a variety of transformers in different regions and countries
• Longest lifetime thanks to high-quality materials
• Type-tested beyond international standards
• High reliability from few parts and low complexity in design
• Easiest maintenance thanks to open design and no need for special tools
• Life-cycle support
• Retrofit solutions
• Easy to upgrade to vacuum technology in existing installation