彼から、最近の学会（エンジニアの研修会？）での研究発表の要旨が送ってきました。電線は電柱を使って地上部で張り巡らされている日本と違って、アメリカでは地下に埋設されている場合が多く、景観上も見苦しくないなあと思ってきましたが、一長一短があって、故障した場合は地下に埋設されている場合は修理が結構大変なんだということがわかりました。
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I wanted to let you know that I presented this technical paper about a week ago in Ft Lauderdale, Florida to engineers as a result of some research we conducted at work using actual in service field equipment. Hopefully, it might be of some help to others engineers. The meeting was for the Power Engineering Society's working group of the Institute of Electrical & Electronic Engineers(IEEE). Details below
・・・・・・・・・・・・・・・・・・・・・・・・・・・・・Title:Is Fault Location Killing Our Cable Systems?Abstract:Power outages caused by faults in underground cable systems can be difficult to locate, however it is always advantageous for a utility to restore power within a short time-frame in order to maintain a high level of customer satisfaction, system performance, and profitability. Although there are different ways to determine the location of a fault within a length of underground cable, a common methodology used by electric utilities involves the use of a voltage pulse unit known to many in the industry as a ‘thumper.’ As a derivative of a system wide cable reliability program, based on a condition assessment comparable to cable and accessory manufactures’ quality control standards, one of the largest utilities in North America set forth a field experiment to help quantify the damage to cable insulation caused by fault location thumping. This paper provides insight into the harmful effects of field applied ‘thumping’ and offers recommendations on how utility operations managers can minimize their risk of repeat outages, increase customer satisfaction while maximizing safety, efficiency and reliability.
今日も昼休みに2時間ウォーキングして運動してきました。江戸川の堤防の100mぐらいの坂道の上り下りを3～5往復ぐらい走るつもりでしたが、 １往復だけで息が切れて駄目でした。
園芸学部に隣接した戸定歴史公園にも寄ってみましたが、藤の盆栽が石畳の両側に並木のように並べてあって、紫色の花が満開でした。今の時期はイロハモミジの緑色の新葉が鮮やかですが、赤い葉のモミジもありました。私には名前のわからない花も、楽しませてくれます。
