Method and apparatus for the interturn and interlayer fault test

Details Method and apparatus for the interturn and interlayer fault test Method and apparatus for the interturn and interlayer fault test

1990-02-02

1991-10-22

Harvey, Jack B.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324654, G01R 3106

Patent

active

050599127

ABSTRACT:
A device having a first U-shaped core with an excitation winding and an additional U-shaped core with a measuring winding and a connected display device is configured such that an electric coil as a test piece winding can be wrapped around one of the arms of both U-shaped cores. The U-shaped cores and the yokes which close the cores consist of ferrite and have an air gap formed between the cores and the yokes. A voltage is induced in the winding coil by an excitation winding forming part of an exciting circuit. The stray field generated by a winding turn having an interturn fault, as a result of the short-circuit current flowing therein, induces a voltage in the measuring winding of the measuring curcuit. The measurement is performed at a variable frequency which results in a minimal voltage when the test piece is free from defects.

REFERENCES:
patent: 3267370 (1966-08-01), Praeg
patent: 3667034 (1972-05-01), Freeze
patent: 3753087 (1973-08-01), Tan

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