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Electrical Technology-2019-7-3

2019-07-03View Original

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For the porcelain suspension insulators used in 35kV overhead power lines, their insulation resistance should be measured individually using a megohmmeter with a rating of at least 5000V before installation. Under dry conditions, the insulation resistance value must not be less than _____ MΩ. A.50 B.100 C.300 D.500D

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