Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1994-11-01
1996-06-25
Wieder, Kenneth A.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324536, 324552, 324726, G01R 3106, G01R 3112
Patent
active
055303668
ABSTRACT:
An apparatus for detecting a partial discharge in a high voltage transformer comprising a live tank comprises a metal box detachably connected to the tank; a first acoustic sensor inside the box for converting acoustic waves in a first frequency band to a first electrical output signal; signal conditioning circuitry inside the box for amplifying and filtering the first electrical signal; an electrical to optical converter, inside the box, for converting the amplified and filtered electrical signal to an optical signal; a fiber optic link for carrying the optical signal to a location remote from the transformer; and an optical to electrical converter at the remote location for converting the optical signal to a second electrical signal, the second electrical signal being indicative of a partial discharge inside the tank. The second electrical signal may be fed to an oscilloscope or recording equipment for determination of the occurrence of a partial discharge. Multiple boxes can be deployed to form a system for locating the source of the discharge.
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R. E. James, et al., "Discharge Detection in High-Voltage Power Transformers," Proc. IEEE, vol. 117, No. 7 (Jul. 1970).
ABB Power T&D Company Inc.
Brown Glenn W.
Wieder Kenneth A.
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