抄録
We constructed a leakage current measuring system which can separate it into three frequency components in frequency domain, low (0_??_360 Hz), middle (360 Hz_??_5 kHz), and high (10MHz) frequency. The low, middle and high frequency components are intended to correspond to surface leakage current, dry-band arc and corona discharge, respectively. We verified the developed system so as to confirm that the leakage current mainly containing dry-band arc component has frequency spectrums dominating near several kHz. This new separative leakage current measuring system was applied to the salt-fog test using porcelain samples as a reference. Consequently, we found that the proposed separative measurement is effective to discuss quantitatively the degradation properties of polymer materials as well in the accelerated degradation evaluation test.
