Measurement of Sheet-like Space Charge Distribution and Signal Calibration of Insulator XLPE Using PEA Method

Long-distance power transmission requires durable and high-performance cables with insulators resistant to dielectric breakdown. However, space charge can cause dielectric breakdowns by affecting the electrical characteristics inside the insulator as it is injected, generated, or moved inside the insulating materials. In this study, the sheet-like space charge distribution of the insulator cross-linking polyethylene (XLPE) was measured using the pulsed electro acoustic (PEA) method. As compared to the existing method, a more convenient method was designed and produced using NI’s PXI System and LabVIEW software. Furthermore, a signal calibration program was developed to correct the distortions of the measured signals. The accuracy and reliability of the space charge distribution signals were improved by correcting the distortions of the signals.