欧美久久片软件夜_手机看免费毛片的网站_LSP破解软件库合集链接地址_国产成a人大片在线观看_醉酒后少妇被疯狂内射视频_精品人妻99一区二区三区_日本少妇综合高清_国产醉酒肤白貌美在线观看_最近2024年中文字幕高清_秋霞影院亚洲wm

系統(tǒng)中，故障電流流向電源中性點(diǎn)
通過(guò)牢固的金屬連接，幾乎不涉及地球
電極（圖2）。
這些配電系統(tǒng)用于特定電廠(chǎng)，其中連續(xù)性
供應(yīng)不足是一項(xiàng)基本要求，如果沒(méi)有供應(yīng)
對(duì)人員造成危害或相當(dāng)大的經(jīng)濟(jì)損失，或
需要一次接地故障的值。在這些情況下，絕緣監(jiān)測(cè)
應(yīng)提供可能接地故障的光或聲信號(hào)裝置，
或供應(yīng)設(shè)備故障。
圖2:TN系統(tǒng)中的接地故障
圖3:IT系統(tǒng)中的接地故障
IT系統(tǒng)沒(méi)有直接連接到地球的帶電部件，但它們可以
通過(guò)足夠高的阻抗接地。外露導(dǎo)電部件應(yīng)
單獨(dú)、成組或集體接地至獨(dú)立接地
電極
接地故障電流通過(guò)
接地電極和線(xiàn)路導(dǎo)體電容（圖3）。

systems, the fault current flows towards the power supply neutral point through a solid metallic connection, practically without involving the earth electrode (Figure 2). These distribution systems are used for particular plants, where the continuity of supply is a fundamental requirement, where the absence of the supply can cause hazards to people or considerable economical losses, or where a low value of a first earth fault is required. In these cases, an insulation monitoring device shall be provided for optical or acoustic signalling of possible earth faults, or failure of the supplied equipment. Figure 2: Earth fault in TN systems Figure 3: Earth fault in IT systems IT systems have no live parts directly connected to earth, but they can be earthed through a sufficiently high impedance. Exposed conductive parts shall be earthed individually, in groups or collectively to an independent earthing electrode. The earth fault current flows towards the power supply neutral point through the earthing electrode and the line conductor capacitance (Figure 3).