G - Physics – 01 – R
Patent
G - Physics
01
R
324/29.2
G01R 31/08 (2006.01) G01R 31/02 (2006.01) G01R 31/12 (2006.01)
Patent
CA 1294329
72689-5 ABSTRACT OF THE DISCLOSURE A method of and an apparatus for judging whether a signal of insulating deterioration generated due to deterioration in insulation of an object of measurement is superimposed on the current flowing through this object. Disclosed first is a method of ascertaining the power supply line in a power supply system with two or more power supply lines whose insulating performance has deteriorated by detecting the progressive wave generated by the corona discharge or the partial discharge generated in the section concerned of the line due to deterioration in insulation thereof. Secondly, a method is disclosed of locating the position where the progressive wave has been generated by comparing the phase of the progressive wave at a reference point provided in a common line with each of the phases of the progressive wave in a plurality of power supply lines branching off from the common bus. Disclosed further is an apparatus for carrying out the above methods equipped with a first coil composed of 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.
573967
Ishikura Keizaburo
Kageyama Tomoaki
Maezawa Shigenari
Saigo Akira
Sera Akio
Mitsui Chemicals Incorporated
Smart & Biggar
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