抄録
A new method is presented for detecting an occurrence of the partial discharge (PD) in a high-voltage electrical apparatus due to a dielectric material defect. This method uses the phase information of electormagnetic waves propagated through space. In case the electromagnetic wave due to an internal PD is to be measured when an electrical power apparatus is operating, the signal to noise ratio poses a problem to discuss. The mean power of the background noise is normally higher than that of the signal of interest, and the signal tends to be lost in the background noise. And it is important to develop a non-contact method for detecting the insulation fault. This paper experimentally shows that our proposed “spatial phase difference method” is able to apply to identification of electomagnetic waves due to PD. This method is shown to be useful for detecting prediction of insulation fault.
