US 11,703,536 B2
Insulation and fault monitoring for enhanced fault detection
David Loder, Indianapolis, IN (US); Sándor Hallai, Indianapolis, IN (US); Gábor Nagy, Indianapolis, IN (US); Máté Bérces, Indianapolis, IN (US); and Péter Bence Németh, Indianapolis, IN (US)
Assigned to ROLLS-ROYCE CORPORATION, Indianapolis, IN (US)
Filed by Rolls-Royce Corporation, Indianapolis, IN (US)
Filed on Jun. 25, 2021, as Appl. No. 17/358,754.
Prior Publication US 2022/0413035 A1, Dec. 29, 2022
Int. Cl. G01R 19/165 (2006.01); G01R 31/392 (2019.01); G01R 31/12 (2020.01)
CPC G01R 31/1272 (2013.01) [G01R 19/16576 (2013.01); G01R 31/392 (2019.01)] 20 Claims
OG exemplary drawing
 
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 the high-side voltage rail and 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 comprising a current stage and a prior stage, the secondary resistance circuit having different connections to the high-side voltage rail and the low-side voltage rail during the current stage and the prior stage;
in response to the selective connection, determine a plurality of sample voltage levels corresponding to at least one of the high-side voltage rail or the low-side voltage rail for the plurality of stages, the plurality of sample voltage levels comprising at least one current sample voltage level for a current stage and at least one prior sample voltage level for a prior stage; and
determine whether an internal fault is present in a voltage source connected to the high-side voltage rail and the low-side voltage rail based on the at least one current sample voltage level determined for the current stage and the at least one prior sample voltage level determined for the prior stage.