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AssigneeBender GmbH & Co. KG
InventorDieter Hackl
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A method and insulation monitoring arrangement for insulation monitoring of an electric installation operated using a supply direct voltage and has a first insulation resistance between the positive active conductor and ground and a second insulation resistance between the negative active conductor and ground as well as a functional grounding between the negative active conductor and ground by a ground resistance. The method involves measuring a ground current, which flows in the path of the functional grounding, by means of a DC measuring device; measuring the supply direct voltage by means of a voltage measuring device; computing the first insulation resistance from the supply direct voltage divided by the ground current by means of a computing unit; the condition is valid during operation of the electric installation that the second insulation resistance being at least 100 times greater than the ground resistance.
A method for insulation monitoring of an electric installation (2) which is operated using a supply direct voltage (UDC) and has a first insulation resistance (Riso1) between the positive active conductor (L+) and ground (PE) and a second insulation resistance (Riso2) between the negative active conductor (L−) and ground (PE) as well as a functional grounding between the negative active conductor (L−) and ground (PE) by means of a ground resistance (RE),
An insulation monitoring arrangement (10) for an electric installation which is operated using a supply direct voltage (UDC) and has a first insulation resistance (Riso1) between the positive active conductor (L+) and ground (PE) and a second insulation resistance (Riso2) between the negative active conductor (L−) and ground (PE) and a functional grounding between the negative active conductor (L−) and ground (PE) by means of a ground resistance (RE), the insulation monitoring arrangement (10) having a DC measuring device (14) for measuring a ground current (IE) flowing in the path of the functional grounding, a voltage measuring device (12) for measuring the supply direct voltage (UDC), a computing unit (20), which is configured for computing the first insulation resistance (Riso1) from the supply direct voltage (UDC) divided by the ground current (IE), the condition being valid during operation of the electric installation (2) that the second insulation resistance (Riso2) is at least 100 times greater than the ground resistance (RE).
Dependencies are inferred from the claim text.