OVE/ONORM EN 61557-9:2000被替代
Electrical Safety In Low Voltage Distribution Systems Up To 1 Kv A.c. And 1,5 Kv D.c. - Equipment For Testing, Measuring Or Monitoring Of Protective Measures - Part 9: Equipment For Insulation Fault Location In It Systems
出版：Osterreichisches Normungsinstitut
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