配電用電線・架空ケーブルにおける耐環境性試験法の動向と課題

摘要

As for distribution wire, overhead cable, and outdoor terminal joints, since their insulators and sheathes are exposed outdoors, the environmental stress affects their deterioration progress. Recently, there being few opportunity of equipment replacement, the numbers of old equipments on their field have been increasing, and so the influence of the environmental stress accumulation has been anticipated. Therefore it is hoped for the development of the environmental resistance test to be able to assess the stress received in the periods of being used. However, at present there is not enough explanation about test procedure and criteria. Environmental deterioration states of the equipments which were not necessarily understood.%配電用電線，架空ケーブル及び屋外終端接続部は，絶縁体ヤシースが屋外に暴露されるため，rn環境ストレスの影響が劣化の進行を左右する。一九　近年は，設備更新の機会が少なく，設備がrn高経年化しており，環境ストレスの蓄積による影響が懸念されている。よって，使用期間に受けrnる環境ストレスを評価できる環境試験の開発が望まれている。しかし現状は，各種規格の試験方rn法や判定基準の根拠に対する説明及び現行規格に適合した用品類に対する使用条件下での劣化状rn況の把握は十分とは言えない。