基礎防雷外文資料翻譯-文庫吧在線文庫

　　

【正文】 y content. The high frequency is associated with an extremely fast rising front on the order of 10 microseconds to peak current. The lower frequency ponent resides in the long, high energy tail or followon current in the impulse. The grounding system appears to the lightning impulse as a transmission line where wave propagation theory applies. A single point grounding system is achieved when all equipment within the structure(s) are connected to a master bus bar which in turn is bonded to the external grounding system at one point only. Earth loops and differential rise times must be avoided. The grounding system should be designed to reduce ac impedance and dc resistance. The shape and dimension of the earth termination system is more important a specific value of the earth electrode. The use of counterpoise or crow39。湯，四，波動現象，多佛出版社，臺北。 6。 Golde， .，閃電，學術出版社，紐約， 1977。如果在戶外時附近有閃電擊中，應該躲到安全的位置，丟掉手中的金屬物體，雙腳蜷縮在一起，低著頭，雙手捂在耳朵上，以避免雷聲震壞耳膜。快速上升時間條件下，電纜電感成為重要的高瞬態電壓可以使用較長的引線。采用徑向技術可以降低阻抗，能讓雷電能量發散，因為每個接地導體的都有一個電壓梯度，他們應該被連接到地面設施。 接地 接地系統必須面對地球的低阻抗和阻力。進一步的研究和試驗仍在進 行中，以便更充分地了解各種高空防雷裝置的可行性。 避雷針 從富蘭克林研究雷電開始，就使用避雷針進行建筑物防雷并引流接地。 3。美國保險公司的資料顯示每 57 索賠有一次是因為雷擊損壞。 附件 1：外文資料翻 譯譯文 基礎防雷 簡介 閃電是一個反復無常，隨機和不可預測的事件。 2。間接影響是，多數時候對電容，電感出現電磁影響。在等效電力場所，鈍尖桿被看作是一種有效的避雷針類型。所有金屬導體應進入連接，如燃氣及水管道，信號線，空調管道，鐵路軌道，橋式起重機等應被接地系統。 單點接地系統是將所有內部設備連接到一根主母線在連接到外部接地系統。此外，還可以保護傳入和傳出的數據和信號線。在出現雷暴的時候，在室內或汽車里的時候，應避免接觸水和其他一些的金屬物件 。 參考文獻 1。 5。 8。 physical characteristics include current levels sometimes in excess of 400 kA, temperatures to 50,000 degrees F., and speeds approaching one third the speed of light. Globally, some 2020 ongoing thunderstorms cause about 100 lightning strikes to earth each second. USA insurance pany information shows one homeowner39。s products have been tested to rigid ANSI/IEEE/ISO9000 test standards. Avoid lowpriced, bargain products which proliferate the market (caveat emptor). Detection Lightning detectors, available at differing costs and technologies, sometimes are useful to provide early warning. An interesting application is when they are used to disconnect from AC line power and to engage standby power, before the arrival of lightning. Users should beware of overconfidence in such equipment which is not perfect and does not always acquire all lightning data. Education Lightning safety should be practiced by all people during thunderstorms. Preparedness includes: get indoors or in a car。 Standards The marketplace abounds with exaggerated claims of product perfection. Frequently referenced codes and installation standards are inplete, out dated and promulgated by mercial interests. On the other hand IEC, IEEE, MILSTD, FAA, NASA and similar documents are supported by background engineering, the peerreview process, and are technical in nature. Summary It is important that all of the above subjects be con