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DECREASING BACKFLASHOVER NUMBERS ON MEDIUM VOLTAGE OVERHEAD LINES LOCATED IN REGIONS WITH HIGH SOIL RESISTIVITY

Davor Mišković ; HEP d.d. Croatia
Ivo Uglešić ; University of Zagreb Croatia

Sažetak

The possibility of decreasing backflashover numbers on medium voltage overhead lines
located in regions with high soil resistivity has been analyzed in this paper. Until now,
activities in this field of protecting overhead lines have been limited by existing surge
protection equipment and possibilities of grounding systems. The possibility of using
chemical rods for getting better ground resistance and introducing metal oxide surge arresters
like line arresters alongside the medium voltage overhead lines is analyzed here.
The idea of this paper is based on facts that metal oxide surge arresters have become very
high quality products with low prices, and so many important experiences in using them like
line arresters exist in the world; and we, in Croatia, have a 10-year-old experience in using
chemical rods like part of grounding system.
The paper treats the problems of backflashover on medium voltage overhead lines, chemical
rods working principles and ways of designing grounding systems like this. Finally the techno
– economic analysis of using chemical rods and metal oxide surge arresters possibilities has
been made, with determining justifiability criteria of using them.
In the conclusion, comparison with knowledge until now has been made, as well as a
suggestion for future use.

Ključne riječi

backflashover; metal oxide surge arresters; overhead line arresters; chemical rods for grounding; medium voltage overhead line; grounding system

Hrčak ID:

198495

URI

https://hrcak.srce.hr/198495

Datum izdavanja:

20.6.2017.

Posjeta: 708 *