報告書番号

H11018

タイトル（和文）

送電用がいしの着雪時フラッシオーバ特性の評価（Ⅰ）－塩雪害を模擬した着雪がいしの実規模フラッシオーバ試験－

タイトル（英文）

Evaluation on Flashover Voltage Property of Snow Accreted Insulators for Transmission Lines, PartI- Full-scale Flashover Voltage Tests of Snow Accreted Insulators, Simulating Wet and Packed Snow Mixed with Sea-salt-

概要 （図表や脚注は「報告書全文」に掲載しております）

2005年12月に新潟下越地域において発生した，塩雪害の原因究明と対策構築の一環として，人工雪を用いた着雪課電試験の検討を行うとともに、その試験実施により各種がいしのフラッシオーバ特性を評価した。その結果，154kV実規模がいしについて，導電率の高い湿雪が圧密着雪した状況を再現するとともに、着雪から課電試験までを効率的に実施できることを見出した。また、長幹がいし・懸垂がいしともに，着雪導電率の増大に伴い，フラッシオーバ電圧が低下する傾向が認められ，懸垂がいしのフラッシオーバ電圧は，長幹がいしに比べて高く，塩雪害対策品として有効であることが確認された。

概要 （英文）

In December 2005, Japan experienced a major outage in Niigata Kaetsu area due to a large amount of wet snow mixed with sea-salt accreted on several transmission insulators. To clarify the cause of the snow damage and increasing reliability of the networks, a 154 kV class full-scale snow test procedure to be used for evaluation of different insulator designs was developed and artificial flashover voltage tests of snow accreted insulators were carried. The test procedure consisted of four steps, 1) generation of artificial snow with defined conductivity, 2) accretion of packed snow on the insulator sample, 3) increase of liquid water content of the accreted snow, 4) voltage application.
As the test results, the target values for wet and packed snow with defined conductivity were reproduced and effectiveness of the test procedure for the evaluation of flashover properties of 154 kV class insulators was verified. High voltage flashover tests showed that the flashover voltage of both long rod and cap & pin insulators were decreased with the increase of snow conductivity. Also, cap & pin insulators showed sufficient higher flashover voltage than long rod insulators and substitution of cap & pin insulators for long rod insulators seemed to be reasonable as a countermeasure against the snow damage.

報告者

キーワード