Overvoltage Protection and Isolation Coordination

Overvoltage Protection and Isolation Coordination

Term: Winter

Announcements

In exercise 2 some calculations with the electromagnetic transient program EMTP ATP will be done. This program is also needed to complete the bonus work. All students with access to a notebook are asked to bring that along.

Content

  • Introduction: Definition and aims of Isolation co-ordination according to IEC 60071
  • Determination of representative overvoltages:
    • Origin and classification of overvoltages (Operating voltage and temporary overvoltages, Slow front overvoltages, Fast front overvoltages)
    • Travelling wave effects on lines
    • Characteristics of overvoltage protective devices
  • Determination of co-ordination withstand voltage:
    • Insulation strength for different voltage shapes and geometric configurations
    • mathematical description of flashover probabilities
  • Determination of required withstand voltage:
    • Atmospheric correction
    • Safety factor for internal and external insulations
  • Standard withstand voltage and testing procedures

Dates of the lecture in WS 2019/2020

Dates of the exercise in WS 2019/2020

Exam

02.04.2020 at 13:00 – 16:00 o'clock in room S3|06/052

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Additional reading

Please refer to chapter one of the slides of the lecture

A good overview about Isolation coordination is provided by:

Hileman, Andrew R.: Insulation Coordination for Power Systems, CRC Press, 1999

And regarding transient phenomena:

Haginomori, E.; Koshiduka, T., Arai, J. and Ikedam H.: Power System Transient Analysis: Theory and Practice using Simulation Programs (ATP-EMTP), John Wiley & Sons, 2016:

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