DocumentCode :
2530981
Title :
Solid insulation covering of conductors improves air insulation systems
Author :
Walfridsson, Lars ; Fromm, Udo ; Kron, Anna ; Liu, Rongsheng ; Ming, Li ; Schutte, Thorsten ; Windmar, Dan
Author_Institution :
ABB Corp. Res., Vasteras, Sweden
fYear :
1998
fDate :
22-25 Jun 1998
Firstpage :
502
Lastpage :
505
Abstract :
In laboratory set-ups, polymer covering of the electrodes has resulted in the reduction of the insulating distances by a factor two. One of the problems with covered conductors is however that of creeping discharges on the surface of the covering. The aim of this work was to investigate how creeping discharges develop under lightning impulse (1.2/50 μs) on two covered conductors at a 90-degree angle to each other. Furthermore, the aim was to investigate how to stop the propagation of a creeping discharge. This was achieved by inserting at least one cable termination, e.g. the type of termination used for high voltage cables, into the discharge path. The experiments showed that a set-up with two crossing cables can withstand very high voltages without any shed or termination of the creeping discharges. Further tests show a considerable increase of the breakdown voltage in other arrangements comprising covered electrodes. This was accomplished by using two cable terminations at each cable end to stop the propagation of creeping discharges
Keywords :
air insulation; conductors (electric); electric breakdown; electrodes; insulating coatings; organic insulating materials; polymer films; surface discharges; air insulation; breakdown voltage; conductor; creeping discharge; electrode surface; high voltage cable termination; insulating distance; lightning impulse; polymer; solid insulation covering; Cables; Conductors; Electrodes; Laboratories; Lightning; Plastic insulation; Polymers; Solids; Surface discharges; Voltage;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Conduction and Breakdown in Solid Dielectrics, 1998. ICSD '98. Proceedings of the 1998 IEEE 6th International Conference on
Conference_Location :
Vasteras
Print_ISBN :
0-7803-4237-2
Type :
conf
DOI :
10.1109/ICSD.1998.709334
Filename :
709334
Link To Document :
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