Research on Electric Field Distribution and Protection Technology of Live line Workers on ±500kV Flexible DC Transmission Lines

Wu, Tian; Liu, Shiqi; Jun, Lu; Li, Benliang

doi:10.1109/igbsg.2019.8886181

Cited by 1 publication

(1 citation statement)

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“…For its economic development, the ever-increasing demand for electrical energy in China requires the upgrading of electrical energy infrastructure, especially with the incorporation of renewables sources such as wind and solar energy. A high-voltage direct current (HVDC) transmission systems is one of the most important candidates to reliably deliver large amounts of energy over thousands of miles [ 1 ]. When electrical energy is brought to the vicinity of a highly populated area, the transmission is done usually with cables.…”

Section: Introductionmentioning

confidence: 99%

Electrical Property of Polypropylene Films Subjected to Different Temperatures and DC Electric Fields

et al. 2021

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A polypropylene (PP) film is usually used as a dielectric material in capacitors as well as cables. However, PP films may degrade because of the combined effect of temperature and electric field. In an earlier study, plain PP films and PP films loaded with nano-metric natural clay were studied under sinusoidal (AC) electric fields at power frequency and temperatures above the ambient. To better understand the electrical characteristics of PP film under various conditions, the objective of this study is to determine the time-to-breakdown of the plain PP and PP filled with 2% (wt) natural nano-clay when subjected to time-invariant (DC) electric fields at elevated temperatures. In order to achieve this objective, the effects of uniform as well as non-uniform electric fields were compared at the same temperature for the PP film. In this study, experimental results indicated that the time-to-breakdown of all PP films, plain or filled with nano-clay, decreases with the increase in electric field intensity, non-uniformity of the electric field, and temperature. It was also found that the time-to-breakdown of PP film filled with 2% (wt) natural nano-clay under DC electric field is longer and less sensitive to temperature. Furthermore, when compared with the results under the uniform electric field, PP film filled with 2% (wt) nano-metric natural clay indicates shorter time-to-failure under non-uniform DC electric fields. Finally, the morphology of the samples was observed by digital camera, optical micrography, and SEM, to better understand the mechanism of the breakdown.

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Section: Introductionmentioning

confidence: 99%