Earth wire selection

  • Friedrich Kiessling
  • Peter Nefzger
  • João Felix Nolasco
  • Ulf Kaintzyk
Part of the Power Systems book series (POWSYS)


Most overhead transmission lines having voltages of 110 kV and above are provided with earth wires (or ground wires). In this context, the term earth wire is used for all types of conductors on earth potential according to EN 50 341-1, although all earth wire designs consist of a multitude of individual strands. The main purpose of the earth wires is the protection of the conductors against the direct incidence of lightning strokes, that can cause line outages (see Chapter 4). However, lightning strokes, even when reaching the earth wires, may cause a voltage rise at the towers high enough to cause a back-flashover from the tower to the conductor along the insulator set. Thus, in order to minimize the occurrence of flashovers along the insulator sets, beside using earth wires, it is necessary to reduce the voltage increase on the towers; this can be obtained through an appropriate earthing of the towers either by counterpoise wires, by deep rods or other means (see Chapter 5).


Short Circuit Circuit Breaker Optical Cable Optical Fibre Cable Overhead Line 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2003

Authors and Affiliations

  • Friedrich Kiessling
    • 1
  • Peter Nefzger
    • 2
  • João Felix Nolasco
    • 3
  • Ulf Kaintzyk
    • 4
  1. 1.BaiersdorfGermany
  2. 2.HemmingenGermany
  3. 3.Belo HorizonteBrasil
  4. 4.Siemens AGPower Transmission and DistributionErlangenGermany

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