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AssigneePhoenix Contact GmbH & Co. KG
InventorsWolfgang Hoeft, Andreas Senger, Christian Bacht
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A monitoring device for an ungrounded electric network of a photovoltaic system. The monitoring device includes a short circuit measuring circuit having a first electric measuring circuit conductor connecting a first electric pole of the photovoltaic system with a reference point by means of at least one protective component, and second electric measuring circuit conductor for connecting a second electric pole of the photovoltaic system with ground be means of at least one protective component. A first component is connected between one of the measuring circuit conductors and ground, and a measuring device for measuring an electric parameter of the first component, wherein a non-zero value of the parameter and/or a change of the value of the parameter indicate an electric fault between the photovoltaic system and ground.
Monitoring device for an ungrounded electric network (2) of a photovoltaic system (4) having a short circuit measuring circuit which comprises a first electric measuring circuit conductor (12) for connecting a first electric pole (8) of the photovoltaic system (4) with a reference point (20) via at least one protective component (13), and a second electric measuring circuit conductor (14) for connecting a second electric pole (10) of the photovoltaic system (4) with a reference point (20) via at least one protective component (13), wherein both measuring circuit conductors (12, 14) form a mutual short between both electric poles (8, 10) of the photovoltaic system,
Monitoring device according to the previous claim, furthermore having a second component (18) integrated in the second measuring circuit conductor (14) of the short circuit measuring circuit,
Monitoring device according to the previous claim, wherein the measuring device (22) is designed for measuring the electric parameter of the first and the second component (16, 18).
Photovoltaic system (4), comprising at least one photovoltaic module for generating electric current, wherein the electric network (2) of the photovoltaic system (4) is designed as an ungrounded electric network (2) and
Method according to the previous claim, comprising also the following steps:
Dependencies are inferred from the claim text.