CPC G01R 31/1272 (2013.01) [G01R 27/02 (2013.01)] | 20 Claims |
1. A fault monitoring device comprising:
a primary resistance circuit configured to connect to a high-side voltage rail and a low-side voltage rail of a high voltage bus of a power system;
a secondary resistance circuit configured to selectively connect to at least one of the high-side voltage rail or the low-side voltage rail via a switching circuit; and
a controller configured to:
selectively connect the secondary resistance circuit to the high-side voltage rail and the low-side voltage rail over a plurality of stages;
in response to the selective connection, measure a plurality of sets of voltages over the plurality of stages; and
determine a plurality of pairs of resistance values for a high-side insulation resistance and a low-side insulation resistance of the power system, each pair of resistance values comprises a respective first resistance value of the high-side insulation resistance and a respective second resistance value of the low-side insulation resistance, and each pair of resistance values based on a current set of measured voltages of a current stage of the plurality of stages and a prior set of measured voltages for a prior stage of the plurality of stages.
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