Professor Jürgen Schlabbach studied electrical engineering at the Technical University of Darmstadt, followed by 10 years with Lahmeyer International, working on national and international electricity distribution for domestic and industrial use. Since 1992 he has worked on power generation and distribution as well as regenerative energy usage at the University of Bielefeld. He is a member of the VDE and IEEE.Dr Dirk Blume is Managing Director of TEAM GmbH in Herten. After studying electrical engineering at the University of Dortmund, he went on to work on his PhD on the analysis of electricity networks. His current field of interest includes measurement instrumentation and systems in the investigation and analysis of voltage quality as well as failure analysis.Dr Thomas Stephanblome is manager of EUS GmbH, developing innovative energy conversion and storage techniques. After studying electrical engineering at the University of Dortmund he completed his PhD on superconducting magnetic energy storage in electricity network management. His current responsibilities include network management as well as projection and realisation of emergency measures to secure voltage quality.

• Chapter 1: IntroductionChapter 2: Harmonics and interharmonicsChapter 3: Voltage fluctuations and flickerChapter 4: Voltage unbalanceChapter 5: Measurement and assessment of system perturbationsChapter 6: CountermeasuresChapter 7: Notes on practical procedures

Professor Jürgen Schlabbach studied electrical engineering at the Technical University of Darmstadt, followed by 10 years with Lahmeyer International, working on national and international electricity distribution for domestic and industrial use. Since 1992 he has worked on power generation and distribution as well as regenerative energy usage at the University of Bielefeld. He is a member of the VDE and IEEE.Dr Dirk Blume is Managing Director of TEAM GmbH in Herten. After studying electrical engineering at the University of Dortmund, he went on to work on his PhD on the analysis of electricity networks. His current field of interest includes measurement instrumentation and systems in the investigation and analysis of voltage quality as well as failure analysis.Dr Thomas Stephanblome is manager of EUS GmbH, developing innovative energy conversion and storage techniques. After studying electrical engineering at the University of Dortmund he completed his PhD on superconducting magnetic energy storage in electricity network management. His current responsibilities include network management as well as projection and realisation of emergency measures to secure voltage quality.

• Chapter 1: IntroductionChapter 2: Harmonics and interharmonicsChapter 3: Voltage fluctuations and flickerChapter 4: Voltage unbalanceChapter 5: Measurement and assessment of system perturbationsChapter 6: CountermeasuresChapter 7: Notes on practical procedures

Professor Jürgen Schlabbach studied electrical engineering at the Technical University of Darmstadt, followed by 10 years with Lahmeyer International, working on national and international electricity distribution for domestic and industrial use. Since 1992 he has worked on power generation and distribution as well as regenerative energy usage at the University of Bielefeld. He is a member of the VDE and IEEE.Dr Dirk Blume is Managing Director of TEAM GmbH in Herten. After studying electrical engineering at the University of Dortmund, he went on to work on his PhD on the analysis of electricity networks. His current field of interest includes measurement instrumentation and systems in the investigation and analysis of voltage quality as well as failure analysis.Dr Thomas Stephanblome is manager of EUS GmbH, developing innovative energy conversion and storage techniques. After studying electrical engineering at the University of Dortmund he completed his PhD on superconducting magnetic energy storage in electricity network management. His current responsibilities include network management as well as projection and realisation of emergency measures to secure voltage quality.

• Chapter 1: IntroductionChapter 2: Harmonics and interharmonicsChapter 3: Voltage fluctuations and flickerChapter 4: Voltage unbalanceChapter 5: Measurement and assessment of system perturbationsChapter 6: CountermeasuresChapter 7: Notes on practical procedures