Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1988-08-05
1990-05-29
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324521, 324522, 324529, 324536, 324541, 324551, G01R 3102
Patent
active
049299034
ABSTRACT:
A method of and apparatus for the detection of insulation deterioration in an electrical power supply system utilizes the detection of a progressive wave generated by a corona discharge or partial discharge due to such insulation deterioration. Sensing of said progressive wave may be effected by an apparatus comprising: a first coil having two primary windings, wound with the same number of turns and in the same direction, and a secondary winding, the primary and secondary windings being wound on a core whose magnetomotive force and magnetic flux density are roughly proportional to each other; a second coil composed of a primary winding and a secondary winding both wound on a core whose magnetomotive force and magnetic flux density are roughly proportional to each other; and an impedance circuit. Determination of the position of insulation deterioration may be effected by comparing the phase of the progressive wave at a reference point in a common bus with the phase of the progressive wave in each of the power supply lines branching off from the common bus.
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Ishikura Keizaburo
Kageyama Tomoaki
Maezawa Shigenari
Saigo Akira
Sera Akio
Eisenzopf Reinhard J.
Mitsui Petrochemical Industries Ltd.
Mueller Robert W.
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