The placing of line surge arresters and fuses on 11 and 12 kV lines to protect equipment against lightning
Date
2001-03
Authors
Dirkse van Schalkwyk, W. J.
Journal Title
Journal ISSN
Volume Title
Publisher
Stellenbosch : Stellenbosch University
Abstract
ENGLISH ABSTRACT: Unshielded distribution lines has a poor performance during lightning activity. Lightning
initiates flashovers between the phases and earth and causes line breakers to trip several
times during a lightning storm. In addition equipment like fuses, surge arresters and
transformers are damaged by lightning and cause in some cases long power interruptions
to customers.
The application of line surge arresters on distribution lines is a solution that is
implemented worldwide to limit the lightning related problems. This thesis investigated
using line surge arresters in conjunction with bushing-mount fuses to decrease nuisance
fusing and transformer damage during lightning activity.
Two new pieces of equipment (dropout surge arresters and transformer bushingmount
fuses) were developed and strategically placed on 4 different distribution lines.
Equipment failures decreased by 90 % while financially the project had an excellent
return on investment.
AFRIKAANSE OPSOMMING: Distribusie lyne sonder skermdrade presteer swak gedurende weerlig aktiwiteit. Weerlig veroorsaak oorvonking tussen fases en aard geleiers wat lei tot breker klinke. Transformators, sekerings, stuwingsafleiers en ander toerusting word ook deur weerlig beskadig en veroorsaak in sommige gevalle lang toevoer onderbrekings. Installering van lyn stuwingsafleiers op distribusielyne is 'n metode wat wêreldwyd gebruik word om oorvonking en weerligskade te beperk. Hierdie tesis ondersoek die installering van lyn stuwingsafleiers en deurvoerder gemonteerde sekerings om transformator skade en onnodige blaas van sekerings te beperk tydens weerlig aktiwiteit. Nuwe toerusting (uitval stuwingsafleiers en transformator deurvoerder gemonteerde sekerings) was ontwikkel en strategies op 4 verskillende distribusie lyne geïnstalleer. 'n Negentig persent vermindering in toerusting beskadiging is behaal terwyl die projek finansiël 'n goeie opbrengs op belegging meegebring het.
AFRIKAANSE OPSOMMING: Distribusie lyne sonder skermdrade presteer swak gedurende weerlig aktiwiteit. Weerlig veroorsaak oorvonking tussen fases en aard geleiers wat lei tot breker klinke. Transformators, sekerings, stuwingsafleiers en ander toerusting word ook deur weerlig beskadig en veroorsaak in sommige gevalle lang toevoer onderbrekings. Installering van lyn stuwingsafleiers op distribusielyne is 'n metode wat wêreldwyd gebruik word om oorvonking en weerligskade te beperk. Hierdie tesis ondersoek die installering van lyn stuwingsafleiers en deurvoerder gemonteerde sekerings om transformator skade en onnodige blaas van sekerings te beperk tydens weerlig aktiwiteit. Nuwe toerusting (uitval stuwingsafleiers en transformator deurvoerder gemonteerde sekerings) was ontwikkel en strategies op 4 verskillende distribusie lyne geïnstalleer. 'n Negentig persent vermindering in toerusting beskadiging is behaal terwyl die projek finansiël 'n goeie opbrengs op belegging meegebring het.
Description
Thesis (MEng)--University of Stellenbosch, 2001.
Keywords
Electric power distribution, Electric lines, Lightning, Dissertations -- Electronic engineering, Distribution lines, Theses -- Electronic engineering