...The magnitude of the current that flows during an accident also changes. In the early days, the system was ungrounded, but in the 1910s, W. Petersen of Germany invented a grounding inductance large enough to cancel out the fault current, i.e., the Petersen coil, and this method was also used. However, as the transmission voltage increased, the direct grounding method, which grounds with as small an impedance as possible to suppress overvoltage on the insulation, came to be adopted. A system in which grounding is performed so that the voltage rise when a single line is grounded does not exceed a certain value (1.3 to 1.4 times) is called an effectively grounded system. *Some of the terminology that mentions "Petersen, W." is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…また事故時に流れる電流の大きさも変わる。初期のころは非接地から出発し,1910年代にドイツのペテルゼンW.Petersenが事故電流を打ち消すような大きさの接地インダクタンス,すなわちペテルゼンコイルを発明し,この方式も用いられたが,送電電圧の上昇とともに絶縁上過電圧を押さえるためできるだけ小さいインピーダンスで接地する直接接地方式が採用されるようになった。一線接地時の電圧上昇がある一定値(1.3~1.4倍)をこえないように接地が行われている系統を有効接地系統という。… ※「Petersen,W.」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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