Akihiko Itose

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This study deals with advancement of insulation diagnosis technology by partial discharge (PD) detection with transient earth voltage (TEV) signal in high voltage equipment such as oil-filled transformer. TEV detection method allows to detect signals by attaching TEV sensors to the outer wall of the existing facilities. Experiment and analysis of TEV signal(More)
This study deals with partial discharge (PD) characteristics of epoxy (EP) insulator contaminated with iron powder and moisture placed in a bus duct. PD occurring inside the bus duct would produce a transient earth voltage (TEV) as a product of surface current flowing on the outer wall and impedance of the material. In addition, it deals with development(More)
Partial discharge (PD) occurring inside a bus duct would emit electromagnetic (EM) wave in wide frequency that propagates and leaks to the outside, and it also excites the surface current on the metal wall of the duct. It would produce a transient earth voltage (TEV) as a result of current and impedance of the material. Simulation is performed with a bus(More)
Partial Discharge (PD) is one of symptom that occur due to defect on the high voltage insulation system. PD measurement is needed to monitor the condition of equipment and avoid the failure. This paper deals with PD measurement by using Transient Earth Voltage (TEV) sensor. Applying a given voltage around 2 to 6 kV to artificial defects placed in a metal(More)
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