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.

Why Hitachi ABB Power Grids?

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

Our offering

Vacuum on-load tap-changers

Our new generation of tap-changers uses the latest vacuum interrupter technology. This design philosophy allows the arcs during load commutations to occur in vacuum interrupters and not in the tap-changer oil. This greatly reduces the need for maintenance and creates the potential for using environmentally friendly insulating fluids.

Conventional on-load tap-changers

Unsurpassed simplicity, convenient accessibility and no requirements for special tools are the hallmarks of our conventional on-load tap-changers

Motor-drive mechanisms

The main objective of an electric motor drive unit is to drive the connected on-load tap-changer or large de-energized tap-changers to a higher or lower tap of a transformer.

De-energized tap-changers and switches

Our de-energized tap-changers are the preferred solution of transformer manufacturers worldwide thanks to their simplicity and ease of installation. Multiple deck arrangements make our designs the most compact de-energized tap changers on the market

Bushings

Bushings are critical components in all electrical networks, as their chief role is to bring current at high voltage through a grounded barrier.

Composite insulators

Delivery times for transformer components

Insulation Components

Insulation material based on resin impregnated glass fibers withstanding dielectric, thermal and mechanical stress.

Insulation components and materials

Hitachi ABB Power Grids supplies insulation products and materials for power and distribution transformers offering broad portfolio of insulation products and materials

Interactive tools

Hitachi ABB Power Grids have gathered here some interactive tools that can assist you in your transformer components selection.

Measurement and safety devices

Mechanical components and valves

Hitachi ABB Power Grids supplies insulation products and materials for power and distribution transformers offering broad portfolio of insulation products and materials