IEEE 987-2001 pdf download IEEE Guide for Application of Composite Insulators
1. Overview
1.1 Scope
This is a guide for the application of composite insulators to overhead transmission and distribution lines. Itis based on utility field experiences, results of research laboratory tests, and manufacturersrecommendations.
The guide deals with composite insulators, that include a core, weathersheds, and metal end fittings. Thecore consists of resin and axially-aligned glassfibres. The weathersheds are of polymeric materials.
2.References
This guide shall be used in conjunciton with the following publications. When the following specificationsare superseded by an approved revision, the revision shall apply.
ANSI C29.11-1989, Composite Suspension Insulators for Overhead Transmission Lines–Tests.
IEC 60383-1 (1993-04), Insulators for overhead lines with a nominal voltage above 1000 V– Part 1:Ceramic or glass insulator units for a.c. systems– Definitions, test methods and acceptance criteria.2
IEC 61109 (1992-03), Composite Insulators for a.c. overhead lines with a nominal voltage greater than1000 V- Definitions, test methods and acceptance criteria.
IEEE Std 1024-1988%,IEEE Recommended Practice for Specifying Distribution Composite Insulators.
3. Definitions
These definitions apply specifically to composite insulators. IEEE 100 The Authoritative Dictionary oIEEE Standards Terms,Seventh Edition (B14]”, should be referenced for terms not defined in this clause.
3.1 Structural terms
The following terms apply to the physical composition of the insulator:
3.1.1 core: The axially aligned fibre reinforced resin rod that forms the mechanical load-bearing componentof the insulator.
3.1.2 end fittings: The insulator attachment hardware that is connected to the core.
3.1.3 grading device: A device for controlling the potential gradient at the end fittings. such as a metal ringor various semiconductive polymeric devices
3.1.4 housing: The external polymeric covering installed over the core to afford it protection. Dependingupon the design of the insulator the housing may comprise a separate or integral sheath-weathershed systemin both cases, the weathersheds provide the wet electrical strength and leakage distance, while the sheathprovides the core with protection between weathersheds and near the end fittings
3.1.5 phase-to-phase insulator: An insulator coupling two phases together as a means for controlling con.
ductor spacing during galloping. It is intended to be loaded in tension, torsion, bending, or compression.
3.1.6 post insulator: Any insulator intended to be loaded in tension, bending, or compression. The mostcommon types are a horizontal line post where the post projects nearly horizontally from a pole and isoaded in flexure by the conductor, and a station post insulator used as a bus support in an outdoorsubstation, When post insulators are used in disconnect switch applications, they may also be loaded intorsion.
3.1.7 suspension insulator: Any insulator intended primarily to carry tension loads. It includes tangent,dead-end,and V-string installations.
3.2 Electrical terms
The following terms apply to electrical phenomena that may occur on shed material during service. For addi-tional information see the bibliography given in Annex A
3.2.1 erosion: The loss of material by the physical action of leakage current, corona discharge, or dry bandarcing.
3.2.2 maximum design withstand load (MDWL): The maximum cantilever load in service that theinsulator is designed to carry.
IEEE 987-2001 pdf download
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