Thoughts on the Possibility of Damage of High-Voltage Electrical Insulation below the So-Called Inception Voltage: Simulation under a Superposition of AC and DC Voltage – Part III

M Danikas

doi:10.48084/etasr.2017

Abstract

In a previous work, a typical case is studied, where a solid sheet insulation contains a void under DC or AC voltage. In the present paper, to study the charging phenomenon in HVDC valve windings and cables, a more complex case is studied under a superposition of AC and DC voltage. Real inception voltage is calculated, and it agrees with the experimental results reported in another paper. Moreover, the location of the charging phenomenon is calculated, and it is related to the ratio between AC and DC voltage.

Highlights

For long-distance transmission of electric power, high voltage direct current (HVDC) systems may prove to be less expensive and to suffer lower electrical losses
Converters are the heart of an HVDC converter station, which converts electric power from alternating current (AC) to direct current (DC) or in reverse
The aim is to study charging phenomena in HVDC valve windings and cables, which is a more complex case, where a superposition of AC and DC voltage is applied on the insulation sample

Summary

Yi Yin

Abstract— In a previous work, a typical case was studied, where a solid sheet insulation contained a void under DC or AC voltage. A more complex case is studied in order to study the charging phenomenon in HVDC valve windings and cables under a superposition of AC and DC voltages. Real inception voltage is calculated, and it agrees with the experimental results previously reported. The location of the charging phenomenon is calculated, and it is correlated to the ratio between AC and DC voltage

INTRODUCTION

CONCLUSION