Please use another Browser

It looks like you are using a browser that is not fully supported. Please note that there might be constraints on site display and usability. For the best experience we suggest that you download the newest version of a supported browser:

Internet Explorer, Chrome Browser, Firefox Browser, Safari Browser

Continue with the current browser

Quick and variable reactive power compensation


Siemens Static Var Compensators SVC Classic

Siemens' SVC Classic improves power quality by dynamically injecting the required amount of reactive power into the net. 


The SVC Classic achieves this fast and reliable functionality by use of state-of-the-art light-triggered thyristors (LTT). By deploying these LTTs there is no need for a delicate thyristor control on medium voltage level – a significant plus in reliability and operational safety.

Depending on the application SVC Classic consists of a thyristor controlled reactor (TCR), a thyristor switched capacitor (TSC), or MSCs/MSCDNs. Its modular design provides customized solutions for different requirements.

Do you have individual questions or want to schedule an appointment for a personal consultation?
Arrange a consultation

SVCs at a glance

Increased reliability and stability for your grid

The proven solution SVC Classic – versatile in use from grid stabilization to industrial load compensation.

Whenever fast voltage regulation is required to reliably fulfill voltage stabilization tasks, either in the grid or for large industrial loads, SVC Classic is a proven solution. 

Various control concepts can be combined with a wide range of configurations to match individual applications.


In that way the SVC Classic solutions can be optimally tailored to suit a wide range of requirements:

  • They increase grid reliability by assisting fault recovery and thus reduce the risk of blackouts. They improve the power factor by dynamically providing reactive power
  • They symmetrize unbalance between phases
  • They reduce flicker of large industrial consumers like electric arc furnaces
  • They help industrial customers to achieve more efficient operation by stabilizing the voltage that supplies the plant

A large variety of SVC Classic concepts covers the wide spectrum of applications. Typical voltage levels range from lower medium voltage  up to 800 kV, with typical overall power ratings of up to 1,000 Mvar. 


Concepts tailored to your application and grid’s requirements

The simplest configuration combining a TCR with filter circuits is typical in industrial applications. But – owing to modular design and individual adaptability – the SVC Classic also offers suitable concepts for more complex requirements in grid and industry applications: a tailor-made control concept is combined with the appropriate selection of type and number of parallel branches of different characteristics. 

Continuous adjustment of inductive reactive power

The core functionality of an SVC Classic is the ability to dynamically adjust inductive reactive power with a thyristor controlled reactor (TCR). This adjustment, performed automatically by the control system based on the dynamic grid requirements respectively the load characteristics, results in the stabilizing effect of the SVC Classic. TCRs do not generate transients, but they generate harmonic currents at firing angles above 90°. These harmonics need to be dampened by individually tuned filter circuits.