| 摘要 |
The invention relates to a measuring array with an earth connection point ( 5 ) for determining the insulation resistance (R<SUB>iso</SUB>) of an energized electrical apparatus or of an installation with a supply voltage U<SUB>B </SUB>with a positive pole ( 6 ) and a negative pole ( 7 ), two switches (S<SUB>1</SUB>, S<SUB>2</SUB>) or a corresponding two-way switch being provided for creating a current path between one of the two poles and said earth connection point ( 5 ) in order to determine the insulation resistance (R<SUB>iso</SUB>) generally obtained when one or a plurality of insulation faults occur at any potential reference, two measurements being performed one after the other for determining the insulation resistance, the first switch (S<SUB>1</SUB>) being closed and the second switch (S<SUB>2</SUB>) open during the first of these two measurements and the first switch (S<SUB>1</SUB>) being open and the second switch (S<SUB>2</SUB>) closed during the second of these measurements.
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