High Voltage Braced Insulator Assemblies Design & Application

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Presentation transcript:

High Voltage Braced Insulator Assemblies Design & Application Panel Session PN23 2008 IEEE Transmission & Distribution Exposition & Conference April 24, 2008 Chicago, IL Good morning and welcome to the panel on Design & Application of High Voltage Braced Insulator Assemblies.

High Voltage Braced Insulator Assemblies Design & Application A. C. Baker: Overview & general comments R. A. Bernstorf: Strength ratings D. G. Powell: Horizontal Vee stability R. K. Kihara: Construction

Armless Construction

Load Capacity Improvement

Braced Insulator Assembly

Vertical Load Carrying Capacity vs. Transverse Loading for a Typical 230 kV Horizontal Vee

Unbalanced Longitudinal Loads L1 ≠ L2 T = (V sin θ – H cos θ) tan ω

Horizontal Vee Longitudinal Displacement L1 L2

Horizontal Vee Lines Wind stability limit can be lower than maximum wind speed usually considered. HV assemblies subjected to unbalanced longitudinal loads will be displaced in direction of higher load. Changes in sag will counteract the unbalancing load, establishing new equilibrium at each support point. Iterative solution needed.

Horizontal Vee Wind Speed Stability Limit

Ref. INMR Quarterly Review Quarter 1 2004 230 kV Horizontal Vee Line Ref. INMR Quarterly Review Quarter 1 2004

Rotated Horizontal Vee Ref. INMR Quarterly Review Quarter 1 2004

Braced Post Used as a Longitudinal Restraint Point Ref. INMR Quarterly Review Quarter 1 2004

Tripod Longitudinal Restraint Assembly

Other Loading Considerations Suspension insulators: tension loads only. Brace: no compression loads. Polymer posts: combined loading effects Some Porcelain posts designed for tension /compression only. Do not use for Braced Post Assemblies. Posts : consider buckling strength These subjects will be covered in detail in later presentations.

Electrical Design Brace and Post insulator components must be properly coordinated. Individual components must be adequate to withstand the power frequency and impulse electrical stresses in service. Assembly Leakage Distance. Assembly Dry Arc Distance. Manufacturers should be consulted concerning need for corona rings.

Summary Two types of Braced Insulator Assemblies: Braced Posts & Horizontal Vees (fixed or articulated posts) Different mechanical characteristics. Braced Posts primarily polymer. Consider Horizontal Vee wind stability limits. Longitudinal restraint assemblies can increase the wind stability limit for a Horizontal Vee line. Installation of some Horizontal Vees may require special construction techniques.