PEA Electromagnetic Distortion Reduction by Impedance Grounding and Pulsed Voltage Electrode Configurations.

Guillermo Mier Escurra,Armando Rodrigo Mor,Luis Carlos Castro,Peter Vaessen

doi:10.3390/s21175837

Abstract

Space charges are one of the main challenges facing the constantly increasing use of extruded high voltage direct current (HVDC) cables. The Pulsed Electro-Acoustic (PEA) method is one of the most common procedures for space charge measurements of insulation. One issue with the PEA method is distortion due to the crosstalk between the applied voltage pulse and the acoustic sensor. This work analyzed two factors involved in the reduction in this distortion: the influence of the exposed semiconductor distance between the injection electrodes and PEA test cell, and the influence of adding a reactance at the grounding circuit of the PEA test cell. The interaction of these two factors with the distortion was analyzed through a series of experimental testing. Moreover, the performance regarding distortion after applying a developed coaxial injection was compared with the standard non-coaxial injection configuration. It was observed that these two factors had a direct impact on distortion and can be utilized for the reduction in distortion arising from the crosstalk of the applied pulsed voltage. The results can be utilized for the consideration of practical aspects during the construction of a PEA test setup for the measurement of full-size HVDC cables.

Highlights

With the increasing use of extruded power cables for high voltage direct current (HVDC) systems, the use of methods measuring space charge phenomena has become crucially important
It is well known that space charge phenomena are one of the main challenges facing the development of extruded HVDC cables, as space charges in dielectrics distort electric fields, producing high localized stresses [1,2,3] and influencing the dielectric behavior of dielectric materials [4]
Cell. toTo good acoustic can, be observed in the reported measurements, as the cable had been contact, silicone oil was used in the interface, and compressive mechanical force waspreviously subjected to HVDC tests that are unrelated to this work

Summary

Introduction

With the increasing use of extruded power cables for HVDC systems, the use of methods measuring space charge phenomena has become crucially important. It is well known that space charge phenomena are one of the main challenges facing the development of extruded HVDC cables, as space charges in dielectrics distort electric fields, producing high localized stresses [1,2,3] and influencing the dielectric behavior of dielectric materials [4]. In [5], it was observed that the local enhancement due to space charges led to electrical treeing and, failure. The authors of [6] used a thermoelectrical model to analyze the aging by space charge phenomena in dielectric materials. The authors of [8] analyzed the aging that occurs during the de-trapping of space charges

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