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Power Arc Protective Fittings for Composite Long Rod Insulators

  • Chapter
Silicone Composite Insulators

Part of the book series: Power Systems ((POWSYS))

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Abstract

Various factors determine whether or not power arc protective fittings need to be used. Network parameters such as the current, duration and frequency of a short circuit are very influential. However, the basic set-up of the insulator string is also significant: Here, it is necessary to differentiate between the cap and pin design and the long rod design, which behave differently when there is a power arc and therefore influence the philosophy of power arc protection. Composite insulators have a long rod design. Unlike porcelain long rod insulators, however, they have the distinctive feature of being able to be manufactured in one piece without any intermediate fittings, even for the highest voltage levels. As a result of this classification, many “power arc” experiences and rules associated with porcelain long rod insulators also apply to composite long rods. There is also one notable difference: The slenderness of the composite long rods results in smaller fitting diameters, which makes it necessary to protect the insulator against corona at lower transmission voltages and can require a coordination of corona and power arc protection.

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Abbreviations

AE:

Cross-section of rod electrode

ATH:

Aluminium trihydrate, Aluminium hydroxide

BPA:

Magnetic field of arc

BR:

Magnetic field of current-carrying rod

CIGRE:

Conseil international des grands reseaux electriques (international council for large electric systems)

FM:

Migration force by self field (on the rod electrode)

FAR:

Force by regeneration of optimal arc root conditions

FA:

Force by aerodynamic resistance

FL:

Force by outer current loop

FT:

Thermal ascending force

FLT:

Force by longitudinal pulling

I:

Current

IT:

Cumulative current

IT1:

Cumulative current for feed 1

IT2:

Cumulative current for feed 2

ISC:

Short-circuit current

IPA:

Power arc current

IP1:

Partial current 1

IP2:

Partial current 2

IEC:

International Electrotechnical Commission

PMD:

Required power for material decomposition

TC:

Technical committee

PD:

Partial discharge

TG:

Glass transition temperature

UPA:

Power arc voltage

c:

Thermal capacity

d:

Diameter of rod electrode

kL:

Factor between 0…1, which determines the part of the arc power to heat the end burning point

t:

Time

tSC:

Time of short circuit

tPA:

Time of power arc

IPA:

Arc current

v:

Arc movement rate

x:

Distance/exponent

λ:

Thermal conductivity

ϑ0:

Temperature on the rod front end

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Author information

Authors and Affiliations

  1. Hellbühlstraße 37, 6102, Malters, Switzerland

    Konstantin Papailiou

  2. Rüchligrain 5, 6274, Eschenbach, Switzerland

    Frank Schmuck

Authors
  1. Konstantin Papailiou
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  2. Frank Schmuck
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Correspondence to Konstantin Papailiou .

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Papailiou, K., Schmuck, F. (2013). Power Arc Protective Fittings for Composite Long Rod Insulators. In: Silicone Composite Insulators. Power Systems. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-15320-4_9

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  • DOI: https://doi.org/10.1007/978-3-642-15320-4_9

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-15319-8

  • Online ISBN: 978-3-642-15320-4

  • eBook Packages: EnergyEnergy (R0)

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