有關(guān)雷擊過電壓中英對(duì)照翻譯-其他專業(yè)-資料下載頁(yè)
2025-01-19 12:22本頁(yè)面
【導(dǎo)讀】在架空線上可能會(huì)由于直接和間接的雷擊而建立起的過電壓。擊中，雷電電流的路徑是直接從云朵到設(shè)備(架空線)。電流可以越過絕緣子，然后順著線桿入地。負(fù)電荷，并將這些負(fù)電荷附在云層下的架空線。假設(shè)云層在發(fā)生閃電的一刻放電，正電荷突然消失，留下負(fù)電荷。在發(fā)生閃絡(luò)時(shí)，閃電層立刻完成放電的。并在幾百微秒內(nèi)全部釋放。在許多情況下，可能產(chǎn)生的電壓通過閃絡(luò)接地而得以限制。長(zhǎng)度只能在閃絡(luò)發(fā)生前允許建立較高的電壓。大多數(shù)青年概況下可采用架設(shè)架空。塔架的電壓升高到一個(gè)值，該值是由電。流1I和經(jīng)過的電阻確立的。大致上，這個(gè)電壓出現(xiàn)在塔架和電力導(dǎo)線之間。低于所能一起閃絡(luò)的值，則不會(huì)引起任何麻煩。用兩條精心放置的接地線和減少。塔腳接地電阻的方法，可改善這種保護(hù)方法。路保護(hù)的簡(jiǎn)單原理。但是從100英尺以上的鐵塔的不太理想的記錄表明，或許還
【正文】 was not struck).If this voltage is less than that required to cause insulator flashover， no trouble by this method is improved by using two carefully placed ground wires and by making tower footing ground resistance of low value. The lightning record of lines supported on towers 80 to 90 feet tall substantiates the simple theory of line protection just poorer record of lines on towers over 100ft in height indicates that other factors， perhaps the inductance of the path down the tower， should be considered. Indirect strokes produce relatively low volages on are of real concern on lowvoltage lines supported on small are of little importance on highvoltage lines whose insulators can withstand hundreds of kilovolts without flas
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