G - Physics – 01 – R
Patent
G - Physics
01
R
324/17
G01R 31/06 (2006.01) G01R 31/34 (2006.01)
Patent
CA 1297155
PATENT 54,576 13 PD-9120 . ABSTRACT OF THE DISCLOSURE A system for detecting and locating a ground fault (34) in the field winding (2) of a machine, in which a DC potential is present across the winding (2) during machine operation and the winding (2) is normally insulated from ground, the system including: a voltage divider (4) connectable in parallel with the winding (2) and having a plurality of tap points spaced apart along the divider (4) a plurality of current path (6,8,14) each connected between a respective tap and a ground connection point (16): a current detector (12) connected in the current paths (6,8,14) for providing an indication of the magnitude of current flowing through each path (6,8,14); and signal processing circuitry (20,22,24) connected to the current detector (12) for providing an indication of the occurrence of a current flow magnitude associated with a ground fault (34) in the field winding (2) and an indication of at least the approximate location of the ground fault (34) along the winding (2).
609048
Bereskin & Parr
Westinghouse Electric Corporation
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