Moisture effects on AC dielectric strength and partial discharge inception voltage in natural monoesters

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Emeric Tchamdjio Nkouetcha ◽  
Ghislain Mengata Mengounou ◽  
Adolphe Moukengue Imano
Keyword(s):  
Water Contamination ◽  
Partial Discharge ◽  
Palm Kernel ◽  
Dielectric Strength ◽  
Glycerol Solution ◽  
Humid Environment ◽  
Insulating Liquids ◽  
Moisture Effects ◽  
Dielectric Performance ◽  
Inception Voltage

Abstract It is essential to analyse the dielectric performance in a humid environment of insulating liquids of plant origin, considered as alternatives to mineral oil (MO) which is not environmentally friendly. This paper focuses on the effects of different moisture levels on the dielectric strength and partial discharge initiation voltage of two natural monoesters, based on castor oil (CO) and palm kernel oil (PKO), and MO. The different samples were moistened with a glycerol solution, then sealed and stored for 12 days to allow further diffusion of moisture into the samples. Dielectric strength was statistically evaluated from IEC 60156. Partial discharge inception voltage (PDIV) experiment was performed in conformity with a modified IEC 61294 purpose at ambient temperature. Based on the experimental observations, the moisture has different behavior on dielectric strength and PDIV of insulating oils. Monoesters have a better withstand to water contamination than MOs in power transformers.

scholarly journals The Influence of Nanoparticles’ Conductivity and Charging on Dielectric Properties of Ester Oil Based Nanofluid

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6540
Author(s):  
Konstantinos N. Koutras ◽  
Ioannis A. Naxakis ◽  
Eleftheria C. Pyrgioti ◽  
Vasilios P. Charalampakos ◽  
Ioannis F. Gonos ◽  
...  
Keyword(s):  
Breakdown Voltage ◽  
Partial Discharge ◽  
Al2o3 Nanoparticles ◽  
Sic Nanoparticles ◽  
Base Oil ◽  
Dielectric Performance ◽  
Lightning Impulse ◽  
The Stability ◽  
Inception Voltage ◽  
Natural Ester

This study addresses the effect of nanoparticles’ conductivity and surface charge on the dielectric performance of insulating nanofluids. Dispersions of alumina and silicon carbide nanoparticles of similar size (~50 nm) and concentration (0.004% w/w) were prepared in natural ester oil. The stability of the dispersions was explored by dynamic light scattering. AC, positive and negative lightning impulse breakdown voltage, as well as partial discharge inception voltage of the nanofluid samples were measured and compared with the respective properties of the base oil. The obtained results indicate that the addition of SiC nanoparticles can lead to an increase in AC breakdown voltage and also enhance the resistance of the liquid to the appearance of partial discharge. On the other hand, the induction of positive charge from the Al2O3 nanoparticles could be the main factor leading to an improved positive Lightning Impulse Breakdown Voltage and worse performance at negative polarity.

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
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