1
Akira Saigo, Shigenari Maezawa, Tomoaki Kageyama, Keizaburo Ishikura, Akio Sera, Junji Suehiro: Method of and apparatus for assessing insulation conditions. Mitsui Petrochemical, Sherman and Shalloway, May 29, 1990: US04929903 (20 worldwide citation)

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 ...


2
Akira Saigo, Shigenari Maezawa, Tomoaki Kageyama, Akio Sera, Fukuso Terunaga: Apparatus for monitoring degradation of insulation of electrical installation. Mitsui Petrochemical, Sherman and Shalloway, May 26, 1992: US05117191 (12 worldwide citation)

According to the invention, there is provided an apparatus for monitoring degradation of insulation of an electrical installation that can constantly monitor its electric equipments and cables for degradation of insulation under hot-line conditions. Said apparatus comprises:


3
Akira Saigo, Shigenari Maezawa, Tomoaki Kageyama, Keizaburo Ishikura, Akio Sera, Junji Suehiro: Apparatus for and method of discriminating signals. Mitsui Petrochemical, Sherman and Shalloway, January 30, 1990: US04897561 (4 worldwide citation)

A signal discriminator adapted to discriminate a signal with a specific frequency out of a current composed of two or more superimposed components with different frequencies. One type of signal discriminator disclosed includes a first coil composed of a primary and a secondary winding wound with the ...


4
Akira Saigo, Shigenari Maezawa, Tomoaki Kageyama: Method and apparatus for detecting insulation conditions. Mitsui Petrochemical, WANG YIPING, April 5, 1989: CN88104898

A method of and an apparatus for judging whether a signal of insulating deterioration is superimposed on the current flowing through this object. Disclosed first is a method of ascertaining the power supply line whose insulating performance has deteriorated by detecting the progressive wave generate ...