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Insulation failure may occur due to aging in cable joint for high voltage overhead transmission. From the view point, this paper deals with the insulation diagnostics by measuring electromagnetic (EM) waves emitted by partial discharge (PD), which is precursory phenomenon of dielectric breakdown. The intensity and frequency spectra of PD radiated EM wave were measured with three different monopole...
Existence of partial discharge (PD) is one of the key issues in high-voltage power module. Thus, identifying a PD location in a power module leads to a higher voltage operation of a power module. An attempt is made to identify PD location in an IGBT power module by measuring electromagnetic wave (EMW) detected by multiple loop sensors. In this paper, a novel technique for identification of PD source...
This paper describes the study on the identification location of partial discharge (PD) which occur at a faulty point in electric equipment. We identified the location of PD utilizing arrival time differences of electromagnetic wave emitted from PD between each loop sensor. An attempt is made to perform direction identification of PD source using the four small loop sensors placed in a fixed interval...
This paper deals with development of small loop antenna sensors with 10 mm in diameter for detecting electromagnetic (EM) waves emitted by partial discharges in the insulation system of inverter-fed motors. Partial discharges (PD) were generated with a pair of crossed enamel wires under ac voltage at 10 kHz for examining various fundamental properties of the small loop sensors; i.e. the frequency...
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