DocumentCode :
52966
Title :
Evaluation on flashover voltage property of snow accreted insulators for overhead transmission lines, part I - field observations and laboratory tests to evaluate snow accretion properties
Author :
Yaji, Kohei ; Homma, Hiroya ; Sakata, Gaku ; Watanabe, Masato
Author_Institution :
Central Res. Inst. of Electr. Power Ind., Yokosuka, Japan
Volume :
21
Issue :
6
fYear :
2014
fDate :
Dec-14
Firstpage :
2549
Lastpage :
2558
Abstract :
This paper presents evaluation of snow accretion properties of long-rod and cap & pin insulators focusing on the phenomena found in the snowstorm in 2005, which related to wet snow accretion packed with sea-salt. Field observations at severe natural environment and laboratory tests under defined conditions were parallelly carried out in order to clarify wet snow accretion process under various conditions. In field observations, it was confirmed that snow easily accreted on insulators at temperature range especially between 0 and +1.0°C. The long-rod insulator´s sheds were bridged more easily than that of cap & pin type because of its narrower shed spacing. In laboratory tests, cylindrical snow accretion, which was found in the snowstorm in 2005, was achieved. The mechanisms on explaining snow accretion on long-rod insulators were found to be similar to those confirmed for wires. The laboratory simulations agree well with the field observations. In order to estimate the amount of snow flux on insulators caused by a snow event for given climatic conditions, an index called the snow accretion potential ability (SAP) was proposed. SAP is defined by using the snow flux and associated with the weight term in the index for the snow stress product (SSP). SAP was adopted to evaluate snow accretion characteristics by field observations and laboratory tests, and the snow accretion phenomenon during a snowstorm in 2005 was discussed.
Keywords :
accretion; flashover; power overhead lines; snow; field observations; flashover voltage property; insulator sheds; laboratory tests; long-rod insulators; overhead transmission lines; snow accreted insulators; snow accretion phenomenon; snow accretion potential ability; snow accretion properties; snow stress product; Humidity; Insulators; Ocean temperature; Power transmission lines; Rain; Snow; Wind speed; Insulators; field observation; laboratory test; shed bridge.; snow accretion;
fLanguage :
English
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
Publisher :
ieee
ISSN :
1070-9878
Type :
jour
DOI :
10.1109/TDEI.2014.004564
Filename :
7031504
Link To Document :
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