Overvoltage Protection and Isolation Coordination

Overvoltage Protection and Isolation Coordination

Term: Summer

Announcements

Please participate at this years online-evaluation!

Details regarding the access will be sent via TuCan.

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New exam date for winter semester 19/20 is saturday 11th of July 2020 13:00 till 16:00 o'clock.

An exam preparation will be held on Tuesday 30th of June from 14:00 o'clock till 16:00 o'clock. Depending on number of participants the revision course will take place digitally or at the university. Therefore all interested students are asked to send an e-mail to:

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 SS 2020

Dates of the exercise in SS 2020

Exam

The exam will take place on saturday, 11th of July from 13:00 till 16:00 o'clock in room S306/052.

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The bonus work may be completed with groups of two students and has to be handed in until the exam date.

Upon completion of the tasks a bonus of 20 Points will be added to the exam grade.

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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