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dwx123456
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樓主  發(fā)表于: 2016-09-14 14:42
由于漏電造成的設備不定時(shí)跳閘,大師們都有什么好的方法或者檢測工具,能夠快速的找到問(wèn)題點(diǎn)?
往事如風(fēng)
科技改變制造
級別: 網(wǎng)絡(luò )英雄

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1樓  發(fā)表于: 2016-09-17 19:27
實(shí)際工廠(chǎng)設備配電我都采用保護接地,極少用漏保(只用在移動(dòng)的設備上)。工廠(chǎng)很多設備帶變頻器,線(xiàn)路對地存在容性阻抗,對于高頻(5~20KHZ的載波)會(huì )存在漏電電流,還有大量的逆變、晶閘管控制焊機,電網(wǎng)存在諧波干擾容易誤動(dòng)作。你想查出這種“漏電”簡(jiǎn)直是做夢(mèng)。如果做好保護接地(并非那種自己打根接地樁的接地,而是用TN-S或TN-C-S的那個(gè)接地),一旦漏電就相當于對地短路,短路電流絕對可以讓你的空開(kāi)跳閘。特別重申,此接地是TN-S或TN-C-S那個(gè)接地,另外地線(xiàn)截面積很相線(xiàn)截面積一樣,不能亂選線(xiàn)徑,否則短路電流一旦把地線(xiàn)先熔斷就起不到保護作用了。TN-S系統自己仔細查相關(guān)資料,本處不羅嗦。
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