Automatic field winding ground detector and locator

Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of ground fault indication

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Details

324522, 324546, 324511, 324545, 324158MG, G01R 3106, G01R 3134

Patent

active

048642428

ABSTRACT:
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 paths (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).

REFERENCES:
patent: 3727123 (1973-04-01), Smith
patent: 3757169 (1973-09-01), Beresnikow
patent: 4525665 (1985-06-01), Smalley
patent: 4551811 (1985-11-01), Taniguti
patent: 4672501 (1987-06-01), Bilac et al.
patent: 4679111 (1987-07-01), Koch et al.
patent: 4812751 (1989-03-01), Roberts et al.

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