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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.

Hitachi Energy gapped core shunt reactor

Most oil-immersed shunt reactors manufactured by Hitachi Energy are based on the so-called gapped core concept. This technical concept is based on the core type technology that has been used within Hitachi Energy since the beginning of the 1970s.

Product scope

  1-phase 3-phase
Reactive power 110 Mvar 300 Mvar
Voltage Up to 800 kV Up to 800 kV


Why Hitachi Energy is the preferred partner?

  • 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, Hitachi Energy has the lowest Mean Time Between Failures (MTBF) figure in the industry
Shunt Reactor

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