Nanostructured-coated XLPE showing improved electrical properties: Partial discharge resistance and space charge accumulation

2011 ◽  
Author(s):  
D. Fabiani ◽  
G. C. Montanari ◽  
A. Cavallini ◽  
A. Saccani ◽  
M. Toselli
Keyword(s):  
Electrical Properties ◽  
Space Charge ◽  
Partial Discharge ◽  
Charge Accumulation

Influence of Space Charge Accumulation by Pre-stress on Partial Discharge Inception Voltage

2020 ◽  
Vol 140 (5) ◽  
pp. 276-284
Author(s):  
Maimi Mima ◽  
Tokihiro Narita ◽  
Hiroaki Miyake ◽  
Yasuhiro Tanaka ◽  
Masahiro Kozako ◽  
...  
Keyword(s):  
Space Charge ◽  
Partial Discharge ◽  
Charge Accumulation ◽  
Inception Voltage

scholarly journals Space charge accumulation in XLPE versus temperature and water content

2018 ◽  
Author(s):  
Torbjørn Andersen Ve ◽  
Frank Mauseth ◽  
Erling Ildstad
Keyword(s):  
Electrical Properties ◽  
Space Charge ◽  
Water Content ◽  
Applied Voltage ◽  
Insulation Material ◽  
Charge Accumulation ◽  
Set Up ◽  
Xlpe Insulation ◽  
Measurement Period ◽  
Rate Of Accumulation

<p>The rate of accumulation and amount of space charge is dependent on several factors, including the electrical properties of the insulation material and the temperature of the insulation. Increased water content has been found to increase the conductivity of XLPE up to three times compared to that of dry XLPE, and is therefore also expected to affect space charge accumulation.<br />This paper presents results of space charge measurements on dry and wet 0.3 mm thick XLPE insulation at 20, 40 and 60 °C. The applied voltage was 10 kV, and the measurement period 14 days. Results show that increased water content leads to the formation of heterocharge at the cathode at 20 °C, as opposed to homocharge in case of a dry sample. At higher temperatures, increased water content mainly decreased the magnitude of accumulated charge.<br />A conductivity-based sectioned model was introduced, and was used to recreate the changes in electric field set up by the accumulated space charge. Comparing the model with the measurements showed that conductivitybased charging was a central mechanism in space charge build-up. At higher temperatures, additional effects not covered by the model were present.</p>

scholarly journals Improved Direct Current Electrical Properties of Crosslinked Polyethylene Modified with the Polar Group Compound

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1624 ◽  
Author(s):  
Chengcheng Zhang ◽  
Jianxin Chang ◽  
Hongyu Zhang ◽  
Chunyang Li ◽  
Hong Zhao
Keyword(s):  
Electrical Properties ◽  
Space Charge ◽  
Functional Groups ◽  
Direct Current ◽  
Breakdown Strength ◽  
Photoelectron Spectra ◽  
Polar Group ◽  
Charge Accumulation ◽  
Scanning Calorimetry ◽  
Polar Functional Groups

To suppress space charge accumulation and improve direct current (DC) electrical properties of insulation materials, crosslinked polyethylene modified with 2-(4-benzoyl-3-hydroxyphenoxy) ethyl acrylate (XLPE/BHEA) containing polar functional groups was prepared by melt blending. The gel content, thermal elongation, tensile strength, elongation at break, elasticity modulus, differential scanning calorimetry (DSC) and X-ray photoelectron spectra (XPS) measurement results demonstrated that the BHEA could slightly enhance the crosslinking of polyethylene (PE) and affect the mechanical properties and crystallization of XLPE, and the BHEA molecule was not easy to precipitate from XLPE after the crosslinking process. XLPE modified with 3.0 phr (parts per hundreds by weight) BHEA could effectively suppress space charge accumulation, reduce DC conduction and improve DC breakdown strength of XLPE at a higher temperature. Deeper traps were introduced in XLPE/BHEA composites due to the polar functional groups in BHEA, which could raise the potential charge injection barrier and reduce the charge carrier number and mobility to suppress space charge accumulation and reduce the conduction current density.

scholarly journals Space Charge Characteristics and Electrical Properties of Micro-Nano ZnO/LDPE Composites

Crystals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 481
Author(s):  
Jun-Guo Gao ◽  
Xia Li ◽  
Wen-Hua Yang ◽  
Xiao-Hong Zhang
Keyword(s):  
Electrical Properties ◽  
Space Charge ◽  
Synergistic Effects ◽  
Nano Particles ◽  
Breakdown Field ◽  
Nano Composite ◽  
Nano Zno ◽  
Additive Particles ◽  
Ldpe Composites ◽  
Short Connection

The synergistic effects of zinc oxide (ZnO) Micro/Nano particles simultaneously filled in low-density polyethylene (LDPE) on the space charge characteristics and electrical properties has been investigated by melt blending micro-scale and nanoscale ZnO additive particles into LDPE matrix to prepare Micro-ZnO, Nano-ZnO, and Micro-Nano ZnO/LDPE composites. The morphological structures of composite samples are characterized by Polarizing Light Microscopy (PLM), and the space charge accumulations and insulation performances are correlated in the analyses with Pulse Electronic Acoustic (PEA), DC breakdown field strength, and conductance tests. It is indicated that both the micro and nano ZnO fillers can introduce plenty of heterogeneous nuclei into the LDPE matrix so as to impede the LDPE spherocrystal growth and regularize the crystalline grains in neatly-arranged morphology. By filling microparticles together with nanoparticles of ZnO additives, the space charge accumulations are significantly inhibited under an applied DC voltage and the minimum initial residual charges with the slowest charge decaying rate have been achieved after an electrode short connection. While the micro-nano ZnO/LDPE composites acquire the lowest conductivity, the breakdown strengths of the ZnO/LDPE nanocomposite and micro-nano composite are, respectively, 13.7% and 3.4% higher than that of the neat LDPE material.

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