Methods and devices for selective insulation monitoring in underground IT power supply systems
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United States of America Patent
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Sep 22, 2020
Grant Date -
Sep 10, 2015
app pub date -
Mar 4, 2015
filing date -
Mar 5, 2014
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Abstract
Methods and devices for insulation monitoring of an ungrounded IT power supply system having at least two phase conductors includes determining an insulation resistance separately for each phase conductor using a separate response value. In one embodiment of the invention, relevant current and voltage distributions are calculated. In another embodiment, a change time window is set within which a second response value is activated. In yet another embodiment, an option of shutting down/continuing operation of the IT power supply system is offered.
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