VSR illustration - MR e-lesson #4, 850 x 400

E-lesson: Variable Shunt Reactor: OLTC brings variability in reactive power compensation

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Balanced reactive power in power grids is an important factor in network operations, to minimize losses and to avoid over-voltages in networks.

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Variable and multi voltage level generation demand variable reactive power compensation. In this e-lesson you will learn what are the roles, applications and network problems addressed by Variable Shunt Reactor (VSR) in power system cycle. You will also learn about the regulation requirements for VSR with OLTC  along with the different regulation types. Also, MRs experience in VSR applications worldwide will be highlighted through certain examples and case studies of network simulations.

Keywords: VSR, OLTC, reactive power flow control, regulation

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Dr. Axel Krämer

Maschinenfabrik Reinhausen GmbH, Regensburg / Germany

– Director Technology Transmission –

Scientific Background

  • Doctorate Electrical Engineering, TU Braunschweig
  • Diploma in Electrical Engineering, TU Braunschweig

Professional Background

  • 30 years at Maschinenfabrik Reinhausen GmbH
  • 4 years at MWB Messwandlerbau AG


Publications (29) in the field of high voltage insulating materials for outdoor applications, instrument transformers and tap-changers, esteemed member of several international technical committees, in 2013 he received the “IEC 1906 Award” in recognition for his involvement in the tap-changer standards work

Author of the book  On-Load Tap-Changers for Power Transformers – Operation Principles, Applications and Selection

Kirchner - 300 x 300

Laurenc Kirchner

Maschinenfabrik Reinhausen GmbH, Regensburg / Germany

– Head of System Application–

Scientific Background

  • Dipl.-Ing. Electrical Engineering, TU Wien
  • Master of Engineering Management, CU Boulder

Professional Background

  • 10 years at Maschinenfabrik Reinhausen GmbH
  • 10 years at ABB Switzerland (4 years head of testing at ABB, MICAFIL)
Nilakantan - 300 x 300

Ajay Krishnan Nilakantan

Maschinenfabrik Reinhausen GmbH, Regensburg / Germany

– Business Development Manager –

Scientific Background

  • Bachelor Electrical & Electronics Engineering, St. Joseph’s College, Chennai, India
  • Master of Science in Power Engineering, HS Darmstadt


Professional Background

  • 6 years at Maschinenfabrik Reinhausen GmbH
  • 2 years at L&T Construction, Chennai, India (Senior Design Engineer, Traction Substation)