This lesson provides an introduction to Variable Shunt Reactors (VSRs) and their role in modern power grids. Participants will learn the fundamentals of reactive power compensation, voltage control, and the challenges utilities face due to fluctuating load conditions and increasing renewable energy integration. The course explains how shunt reactors absorb reactive power, how Variable Shunt Reactors extend this functionality through adjustable reactance, and why on-load tap-changers (OLTCs) are a key enabling technology. Practical grid applications, operational benefits, and the impact of VSRs on voltage stability, transmission efficiency, and grid reliability are covered. By the end of the lesson, attendees will understand when and why VSRs are used and how they contribute to a more flexible and resilient power system.
Lecturers
Martin Guth
Reinhausen GmbH (MR)
Martin Guth holds a B.Eng. in Electrical Engineering and an M.Sc. in Electromobility and Power Networks from OTH Regensburg, Germany. Both degrees were completed in cooperation with Reinhausen with a focus on monitoring and optimization of OLTC switching processes. After working as a Technical Specialist for Transformer Service Solutions with focus on asset management of power transformers, he moved into Business Development, where he is responsible for premium tap-changer applications and grid solutions. His expertise includes reactive power management, voltage control, and Variable Shunt Reactors for transmission and distribution networks.
Laurenc Kirchner
Reinhausen GmbH (MR)
Laurenc Kirchner has an M.Sc. in Electrical Engineering from Vienna Tech, Austria, and an ME from University of Colorado at Boulder, USA. In the last 25 years he collected professional experience in the high voltage field of gas insulated switchgear, transformer service, high voltage bushings and on-load tap-changers. In the past 16 years, he has been at Reinhausen. As head of system application, he is responsible for the technical support of the sales organization. He is also author and co-author of many papers covering variable shunt reactors and phase shifting transformers
