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Partial discharge (PD) is caused by the localised electrical field intensification in insulating materials. Early detection and accurate measurement of PD are very important for preventing premature failure of the insulating material. Detection of PDs in metal-clad apparatus through the transient Earth voltage method is a promising approach in non-intrusive on-line tests. However, the electrical interference...
High Impedance Faults (HIF) on distribution feeders in a power system are abnormal electrical conditions that cannot be detected and cleared by conventional protection schemes due to its low fault current. In this paper, a detection scheme utilizing the distortion around zero-crossing as a distinguishing feature of HIF is proposed. Documented data from an 18-day program of ignition testing undertaken...
Partial discharge (PD) is caused by the deterioration of insulation materials. Its detection and accurate measurement are very important to prevent insulation breakdown and catastrophic failures. Detection of PDs in metal-clad apparatus via TEV method is a promising approach in non-intrusive on-line tests. However, the electrical interference from background environment is the major barrier of improving...
Partial discharge (PD) plays a paramount role in determining system reliability. But noise is always a major limitation of PD measurement. Many research work shows that wavelet transform (WT) has a potential to extract PD pulse from noise environment. De-noising algorithm based on WT has three steps: decomposition, thresholding and reconstruction. The selection of threshold and wavelet base is crucial...
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