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Shunt reactors

A vital part of modern energy systems

A shunt reactor is an absorber of reactive power, thus increasing the energy efficiency of the system. It is the most compact device commonly used for reactive power compensation in long high-voltage transmission lines and in cable systems. The shunt reactor can be directly connected to the power line or to a tertiary winding of a three-winding transformer.

The shunt reactor could be permanently connected or switched via a circuit breaker. To improve the adjustment of the consumed reactive power the reactor can also have a variable rating. If the load variation is slow, which it normally is (seasonal, daily or hourly), a variable shunt reactor (VSR) could be an economical solution for some customer applications.

ABB gapped core shunt reactor Most oil-immersed shunt reactors manufactured by ABB are based on the so-called gapped core concept. This technical concept is based on the core type technology that has been used within ABB since the beginning of the 1970s. The concept of the design is to minimize losses, sound and vibration. Design similarities with large power transformers permit an efficient use of ABB’s long experience of building large transformers, for instance in the areas of insulation build up, production handling and so on.

Product scope



    Reactive power

    110 Mvar

    300 Mvar


    Up to 800 kV

    Up to 800 kV

Why ABB?

    • Since 1960, we have delivered more than 2,500 shunt reactors to 70 countries worldwide
    • Robust design and production excellence ensure exceptional and proven field reliability
    • Lowest total cost of ownership in the industry. ABB has the lowest Mean Time Between Failures (MTBF) figure in the industry.
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