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A comparison of the performance of high-voltage insulator materials in a severely polluted coastal environment
Thesis (PhD)--University of Stellenbosch, 2002.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867614098249744384 |
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| access_status_str | Open Access |
| author | Vosloo, Wallace L. (Wallace Lockwood) |
| author2 | Holtzhausen, J. P. |
| author_browse | Holtzhausen, J. P. Vosloo, Wallace L. (Wallace Lockwood) |
| author_facet | Holtzhausen, J. P. Vosloo, Wallace L. (Wallace Lockwood) |
| author_sort | Vosloo, Wallace L. (Wallace Lockwood) |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (PhD)--University of Stellenbosch, 2002. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/52625 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:46:38.139Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/52625 A comparison of the performance of high-voltage insulator materials in a severely polluted coastal environment Vosloo, Wallace L. (Wallace Lockwood) Holtzhausen, J. P. Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering. High voltages Electric insulators and insulation Electric leakage Electric power transmission -- Environmental aspects Dissertations -- Electrical engineering Theses -- Electrical engineering Thesis (PhD)--University of Stellenbosch, 2002. ENGLISH ABSTRACT: The main aim of this research programme was to compare the relative performance of different insulator materials used in South Africa when subjected to a severe marine pollution environment. A test programme and procedure, test facility and instrumentation were established. Some novel instrumentation and monitoring equipment were developed and built specifically for this research programme, supported by data analysing software programs. In order to compare material performance only, all non-material design variables between the test insulators had to be removed (e.g. creepage distance, connecting length, inter-shed spacing, profile, etc.). To achieve this some of the test insulators had to be specially manufactured. Leakage current, electrical discharge activity, climatic and environmental data was collected successfully over a one-year test period, starting with new test insulators. The peak and energy values of the leakage current were identified as the two main parameters needed to describe the leakage current activity on the test insulators. A correlation was found between the climatic and environmental data and the leakage current data, and it was found that the leakage current can be determined successfully from some of the climatic and environmental parameters monitored by using multiple regression techniques. Surface conductivity and energy were found to be the best parameters to show the maximum and continuous interaction of the insulator material surface with the electrolytic pollution layer. A natural ageing and pollution test procedure was developed, which has become a South African standard and is gaining international acceptance. A model and hypothesis are proposed to describe the electrical discharge activity that takes place on the test insulators and explain the difference in leakage current performance of the various materials. Keywords: Insulator, Pollution, High Voltage, Leakage current, Material performance. AFRIKAANSE OPSOMMING: Die hoofdoel van hierdie navorsingsprogram was om die relatiewe prestasie van verskillende isolatormateriale wat in Suid-Afrika gebruik word te vergelyk in 'n swaar besoedelde marine omgewing. 'n Toetsprogram en prosedure, toets fasiliteit en instrumentasie is gevestig. 'n Paar nuwe instrumente en moniteer toerusting is ontwikkel en gebou spesifiek vir hierdie navorsingsprogram, gesteun deur data analise sagteware programme. Ten einde slegs materiaalprestasie te vergelyk, moes alle nie-materiaal ontwerpsveranderlikes tussen die toetsisolators verwyder word (bv. kruipafstand, konnekteer lengte, tussen-skerm spasiëring, profiel, ens.). Om dit reg te kry moes sommige van die toetsisolators spesiaal vervaardig word. Lekstroom, elektriese ontladingsaktiwiteit, klimaat en omgewingsdata is suksesvol versameloor 'n een-jaar toetsperiode, beginnende met nuwe toets isolators. Die piek en energie waardes van die lekstroom is identifiseer as die twee hoof parameters wat nodig is om die lekstroomaktiwiteit op die toetsisolators te beskryf. 'n Korrelasie is gevind tussen die klimaat- en omgewingsdata en die lekstroom data, en dit is gevind dat die lekstroom data suksesvol bepaal kan word van sekere van die klimaat- en omgewingsparameters wat gemoniteer is deur veelvoudige regressie tegnieke te gebruik. Oppervlakskonduktiwiteit en energie is gevind die beste parameters te wees om die maksimum en kontinue interaksie van die isolatormateriaaloppervlak met die elektrolitiese besoedelingslaag aan te toon. 'n Natuurlike veroudering en besoedeling toetsprosedure is ontwikkel, wat 'n Suid-Afrikaanse standaard geword het en besig is om internastionale aanvaarding te wen. 'n Model en hipotese word voorgestelom die elektriese ontladingsaktiwiteit wat op die toetsisolators plaasvind te beskryf en om die verskil in lekstroomprestasie van die verskeie materiale te verduidelik. S/eufelwoorde: Isolator, Besoedeling, Hoog Spanning, Leek stroom, Materiaal prestasie. Doctoral 2012-08-27T11:35:05Z 2012-08-27T11:35:05Z 2002-04 Thesis http://hdl.handle.net/10019.1/52625 en_ZA Stellenbosch University 262 p. : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | High voltages Electric insulators and insulation Electric leakage Electric power transmission -- Environmental aspects Dissertations -- Electrical engineering Theses -- Electrical engineering Vosloo, Wallace L. (Wallace Lockwood) A comparison of the performance of high-voltage insulator materials in a severely polluted coastal environment |
| title | A comparison of the performance of high-voltage insulator materials in a severely polluted coastal environment |
| title_full | A comparison of the performance of high-voltage insulator materials in a severely polluted coastal environment |
| title_fullStr | A comparison of the performance of high-voltage insulator materials in a severely polluted coastal environment |
| title_full_unstemmed | A comparison of the performance of high-voltage insulator materials in a severely polluted coastal environment |
| title_short | A comparison of the performance of high-voltage insulator materials in a severely polluted coastal environment |
| title_sort | comparison of the performance of high voltage insulator materials in a severely polluted coastal environment |
| topic | High voltages Electric insulators and insulation Electric leakage Electric power transmission -- Environmental aspects Dissertations -- Electrical engineering Theses -- Electrical engineering |
| url | http://hdl.handle.net/10019.1/52625 |
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