Measurement of Sheet-like Space Charge Distribution and Signal Calibration of Insulator XLPE Using PEA Method
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ORIGINAL ARTICLE
Measurement of Sheet‑like Space Charge Distribution and Signal Calibration of Insulator XLPE Using PEA Method Hyung‑Gyu Kim1 · Hyun‑Cheol Jung1,2 · June‑Do Park1,2 · Seung Hwangbo1 Received: 9 October 2019 / Revised: 22 March 2020 / Accepted: 26 June 2020 © The Korean Institute of Electrical Engineers 2020
Abstract 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. Keywords Space charge · XLPE · PEA method · Signal processing · Deconvolution
1 Introduction The technology for long-distance power transmission has been actively researched as of late, and more studies are being conducted about the space charge distribution inside cross-linking polyethylene (XLPE) as insulator for high voltage direct current (HVDC) cables. Space charge can cause dielectric breakdown by affecting the electrical characteristics inside the insulator as it is injected, generated, or moved inside insulating materials [1]. Because this affects Electronic supplementary material The online version of this article (https://doi.org/10.1007/s42835-020-00477-8) contains supplementary material, which is available to authorized users. * Seung Hwangbo [email protected] Hyung‑Gyu Kim [email protected] Hyun‑Cheol Jung [email protected] June‑Do Park [email protected] 1
Department of Automotive Engineering, Honam University, Gwangju 62399, Republic of Korea
Department of Electrical and Electronic Engineering, Honam University, Gwangju 62399, Republic of Korea
2
the performance and life space of cables, many studies are currently underway to evaluate the space charge distribution and insulation performance inside insulators. In this study, the pulsed electro acoustic (PEA) method, which detects acoustic signals from short pulses, was used to measure the space charge distribution. It was designed to automatically measure the space charge distribution when the parameter values such as input voltage and measurement time are input by the user using NI’s PXI system and the LabVIEW software, instead of measuring with an oscilloscope and a function generator. When space charge distribution signals are detected through the PEA method, many distortions, such as noise, reflected waves, attenuation, and dispersion due to the measurin
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