Shunt and series reactors for modern power grids

In modern AC grids, maintaining voltage stability is becoming increasingly challenging as power flows become more dynamic. Shunt and series reactors are essential components for stable and efficient grid operation.

Shunt reactors are used to regulate reactive power and stabilize voltage, particularly under light-load conditions, while series reactors limit current and influence power flow by adding controlled impedance to transmission lines.

Siemens Energy provides shunt and series reactors as proven solutions for reliable and efficient grid operation. The portfolio ranges from 10 MVAr up to 300 MVAr and covers voltage levels from 25 kV to 800 kV—supporting demanding utility and renewable applications.

Depending on grid conditions, shunt reactors are available as fixed or variable solutions: fixed reactors support stable, predefined operation, while variable shunt reactors adapt dynamically to changing system requirements.

The following comparison illustrates how fixed and variable shunt reactors perform under different grid conditions.

Choosing the right solution depends on your grid dynamics.

Shunt reactors are available in different configurations to meet specific system, installation, and operational requirements.

Shunt reactors are used across a wide range of applications, from substations to renewable energy systems, where stable voltage control is essential.

Siemens Energy reactors combine decades of engineering expertise with advanced design capabilities to support reliable and efficient grid operation.

From grid consulting and system design to manufacturing, testing, and lifecycle services, Siemens Energy supports customers across the entire project lifecycle.

From initial studies to long-term service, Siemens Energy supports utilities and grid operators with advanced shunt reactor solutions across the full project lifecycle. Our expertise enables effective voltage control, reliable reactive power compensation, and stable grid operation – even in increasingly complex, renewable-driven networks.