Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1989-05-30
1991-02-26
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324233, 324242, 324521, 324529, 324551, 324559, G01R 3106
Patent
active
049964860
ABSTRACT:
In order to detect interlamination shorts (8 ) in the case of laminated core stacks, the core stack (1) is magnetized with an auxiliary winding. The iron surface (15) is scanned with a measuring coil arrangement (5) comprising two electrically separated, mechanically interlinked coils (6, 7). The output signals from the coils are compared with each other in a downstream measuring instrument (9); in the case of an interlamination short, the fault current through the short-circuited laminations will induce in the coils different, phase-shifted voltages which make it possible to infer the position and size of the interlamination shorts.
REFERENCES:
patent: 4573012 (1986-02-01), Bisson et al.
patent: 4803563 (1989-02-01), Dailey et al.
patent: 4823082 (1989-04-01), Nasu et al.
Elin-Zeitschrift (1984), No. 1/2 Von Schopper, E., pp. 53-62, "Das Elin-Diagnosesystem fur Elektrische Grossmaschinen".
"El Cid Charts The Health of Large Machines," Electrical Review International, vol. 206, No. 11, 3/14/80, p. 54.
Asea Brown Boveri Ltd.
Eisenzopf Reinhard J.
Mueller Robert W.
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