THE PRACTICAL GUIDE TO OUTDOOR HIGH VOLTAGE INSULATORS

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THE PRACTICAL GUIDE TO OUTDOOR HIGH VOLTAGE INSULATORS
Authors: W L VOSLOO
Year: 2018
Publisher:
Language: english
ISBN 13: B091J78WQ8
ISBN 704
Categorie: Electronic Engineering
Pages: 217
Edition: 1

Availability: 5000 in stock

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THE PRACTICAL GUIDE TO OUTDOOR HIGH VOLTAGE INSULATORS W L VOSLOO, R E MACEY, C de TOURREIL
“The Practical Guide to Outdoor High Voltage Insulators” is intended toprovide an understanding of the factors which dictate the behaviour ofoverhead line and substation insulators and to generate an appreciation of theparameters which have a significant influence on their performance and life.The Guide is aimed at utility staff and consulting engineers responsible for theselection, specification, installation and maintenance of insulators. Studentsof the subject and engineers-in-training should also benefit from its use.The emphasis of the book is definitely on the “practical”, and simpleprocedures, decision tables, flow charts and inspection sheets are included –both in the text and on the accompanying CD – to assist those involved in thedesign and operation of electrical transmission and distribution systems. Thestructure of the book is described below.Chapter 2 is especially useful to those who are new to the subject, of highvoltage insulators. It serves to define the terminology used and provide basicinformation on the various insulator types and materials available. The mainphysical attributes which determine the performance of insulators are alsoaddressed.In Chapter 3 the electrical aspects to be considered when selectinginsulators, are discussed. It examines the various mechanisms of flashoverand the relationships between the probability of breakdown and thedimensioning of an insulator.It is impossible to select a suitable insulator for a particular application unlessthe environment in which it is expected to operate is fully understood.Chapter 4 describes the important ambient conditions that influence insulatorperformance and provides techniques for their assessment. Methods tointerpret the climatic data and pollution levels measured, to define a “SiteSeverity Class”, are described. This facilitates the selection of an appropriateinsulator for a given area.With the wide variety of dielectric materials currently being used in themanufacture of outdoor insulators, their relative characteristics need to beknown to ensure their suitability to the application in question. Chapter 5examines the properties of various insulator materials and providesinformation on their advantages, disadvantages and applicability to thedifferent insulator types and constructions.The primary function of overhead line insulators and most substationinsulators is to provide physical support to energised conductors andequipment. Their mechanical characteristics are thus just as important astheir electrical properties. Chapter 6 describes how the forces imposed oninsulators should be analysed with a view to establishing the minimumstrength requirements.Knowledge of the ways in which an insulator may fail in service is vital for thecorrect selection of a new insulator. It is also important to define appropriatemaintenance procedures and inspection techniques for existing units.Chapter 7 explores the different mechanisms of failure applicable to thevarious insulator types and materials – describing their nature and illustratingtheir effects.Chapter 8 lists the IEC documents relating to the different insulator typeswith a view to assisting in the testing of units and in the preparation ofpurchasing specifications.The various electrical, mechanical and environmental factors which determinethe performance of insulators and their vulnerability to failure, as described inChapters 2 to 8, are brought together in Chapter 9 which provides aselection process aimed at ensuring that the insulator type used for aspecific application will yield a long, reliable and maintenance-free service life.Having made the selection, information on the standard lengths, strengths,end fittings, etc. applicable to each insulator type, to facilitate the drafting of ameaningful purchasing specification, is also given.Many insulator failures experienced in service are not the result of theincorrect insulator having been used but are caused by the insulator beingdamaged before or during its installation. Chapter 10 describes how poortechniques used in the storage, transport and handling of insulators cancreate defects, which may only manifest themselves at a much later date andprecipitate tripping, or even dropping, of the line. Precautions to be taken inthe treatment of insulators are listed and can be incorporated in line erectioncontracts and specifications.A variety of insulator inspection methods is described in Chapter 1 Themerits of the techniques and their applicability to the different insulator types,materials and constructions are discussed. An Audit Sheet is provided toassist field staff in the inspection and evaluation of insulators and to determineappropriate response to their findings.When a line is suffering from an unacceptable occurrence of phase-to-groundfaults, the quality of the insulators is usually immediately questioned. In orderto determine the appropriate corrective action to be taken, however, it is vitalto establish the precise nature of the faults and their cause. In this regard,Chapter 11 also describes an investigation procedure designed to identifythe actual breakdown mechanism and, for example, avoid costly re-insulationprogrammes being undertaken which may not, in fact, improve the reliability ofthe system.Finally, Chapter 12 addresses what measures may be taken when theperformance of existing insulation in polluted environments is unacceptable.Replacement of the insulators, particularly in substations, may not be anoption, and some form of maintenance is then necessary. The relative costsand effectiveness of the various mitigation techniques are described. A flowchart is also provided to assist in the selection of the optimum form ofcorrective action.The accompanying CD contains an imperial to SI unit conversion calculator,insulator defect pictures with a short definition sheet, field inspection sheet,insulator handling and transportation cartoons, a site severity calculator, andvideo clips showing various high voltage phenomena such as insulatorpollution flashover.
Categories:
Engineering – Electrical & Electronic Engineering
Volume:
1
Year:
2018
Edition:
1
Language:
english
Pages:
217
File:
233 MB

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