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A statistical method for determining external clearances on overhead lines

Ein statistisches Verfahren zur Bestimmung der äußeren lichten Abstände bei Freileitungen

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Abstract

The EN 50341‑1 provides procedures for establishing internal and external clearances for overhead lines. Internal clearances are selected in a way that an acceptable outage performance is achieved, and the external clearances are then coordinated with the internal clearances to ensure that no flashovers occur to objects in the vicinity of the line. In the standard, this coordination is carried out by assuming that lightning overvoltages will be limited by flashovers of the insulator strings. There are, however, cases where this approach may be too conservative, e.g., when long insulators are needed to obtain an acceptable power frequency flashover performance with insulator pollution. In this paper, a method is presented for determining the external clearances on overhead lines based on a statistical evaluation of the representative lightning overvoltage as defined in the EN 50341‑1.

Zusammenfassung

Die EN 50341‑1 (VDE 0210-1) enthält Verfahren zur Festlegung der inneren (Leiter-Leiter-Abstand) und äußeren lichten Abstände (Leiter-Erde-Abstand) für Freileitungen. Die inneren lichten Abstände werden so gewählt, dass ein akzeptables Stromausfallverhalten erreicht wird, und die äußeren Abstände werden dann mit den inneren Abständen koordiniert, um sicherzustellen, dass keine Überschläge auf Objekte in der Nähe der Leitung auftreten. In der Norm wird bei dieser Koordinierung davon ausgegangen, dass Blitzüberspannungen durch Überschläge an den Isolatorketten begrenzt werden. Es gibt jedoch Fälle, wo dieser Ansatz zu konservativ sein kann, z. B. wenn lange Isolatoren erforderlich sind, um eine akzeptable Netzfrequenz-Überschlagsleistung mit Isolatorverschmutzung zu erreichen. In diesem Beitrag wird eine Methode zur Bestimmung der äußeren lichten Abstände bei Freileitungen vorgestellt, die auf einer statistischen Auswertung der repräsentativen Blitzüberspannung gemäß der Definition in der EN 50341‑1 beruht.

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References

  1. CENELEC, European Standard EN 50341‑1, “Overhead lines exceeding AC 45 kV Part 1: General requirements—common specifications”, July 2013.

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Author information

Authors and Affiliations

  1. Engelbrecht Consulting B.V., Catharinadaal 84, 6715 KD, Ede, The Netherlands

    Christiaan S. Engelbrecht

  2. DNV Netherlands B.V., Arnhem, The Netherlands

    Peet J. Schutte

  3. Independent Insulation Group AB, Ludvika, Sweden

    Jan Lundquist

Authors
  1. Christiaan S. Engelbrecht
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  2. Peet J. Schutte
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  3. Jan Lundquist
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Corresponding author

Correspondence to Christiaan S. Engelbrecht.

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Appendix

Appendix

1.1 Line parameters used for the calculation example

Details of the line configuration under consideration is shown in Fig. 13. The calculated electrical parameters of this line are listed in Table 2.

Fig. 13
figure 13

An example 380 kV line configuration

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Table 2 Calculated parameters
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Engelbrecht, C.S., Schutte, P.J. & Lundquist, J. A statistical method for determining external clearances on overhead lines. Elektrotech. Inftech. 139, 404–411 (2022). https://doi.org/10.1007/s00502-022-01030-3

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  • DOI: https://doi.org/10.1007/s00502-022-01030-3

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