scholarly journals Impact of accelerated aging of epoxy‐Ni nanocomposites on space charge variation adopting pulsed electro acoustic technique

SPE Polymers ◽  
2020 ◽  
Vol 1 (1) ◽  
pp. 36-44
Author(s):  
Myneni Sukesh Babu ◽  
Somasundaram Karthikeyan Amizhtan ◽  
Michael G. Danikas ◽  
Ramanujam Sarathi
Keyword(s):  
Space Charge ◽  
Accelerated Aging ◽  
Charge Variation ◽  
Acoustic Technique

scholarly journals Review of space charge measurement by pulsed electro-acoustic technique

2020 ◽  
Vol 20 (2) ◽  
pp. 646
Author(s):  
Mohd Haris Asyraf Shee Kandar ◽  
Nor Akmal Mohd Jamail ◽  
Nordiana Azlin Othman ◽  
Qamarul Ezani Kamarudin ◽  
Nor Shahida Mohd Jamail ◽  
...  
Keyword(s):  
Electric Field ◽  
Space Charge ◽  
Electrical Breakdown ◽  
Ethylene Vinyl Acetate ◽  
Low Density Polyethylene ◽  
Time Interval ◽  
Specimen Thickness ◽  
Low Density ◽  
Internal Electric Field ◽  
Acoustic Technique

<p>Pulsed electro-acoustic (PEA) is well known as a non-destructive technique for testing and describing space charge profiles in the insulation. Degradation due to moisture, ageing, external flashover, partial discharge and space charge are considered as insulation defects that is an issue in high voltage insulator. Space charge may distort the internal electric field that may lead to an electrical breakdown. For instance, a method based on an acoustic phenomenon can be used to describe the space charge profiles. This paper compares several earlier researches on different specimen of PEA method and reviews their results to find the space charge distribution profiles. The scope of the review includes types of methods used. The acoustic technique is considered for this study. It has been observed that the PEA technique successfully gives the same result as theoretical that is based on the obtained profile. Linear low-density polyethylene (LLDPE) composite demonstrates about 89 % lower charge density value compared to cross-linked polyethylene (XLPE) and polypropylene (PP) composite. While the electric field value of ethylene-vinyl acetate (EVA) sample is 75 % lower than low-density polyethylene (LDPE) sample. This study found that the time interval, specimen thickness and the electric field sway the space charge profiles. </p>

Accelerated aging of fast thermal cycle effects on the behavior of space charge in polyimide

2017 ◽  
Vol 24 (5) ◽  
pp. 3182-3190 ◽  
Author(s):  
Sichen Qin ◽  
Youping Tu ◽  
Shaohe Wang ◽  
Yi Cheng ◽  
Bingying Chen ◽  
...  
Keyword(s):  
Space Charge ◽  
Thermal Cycle ◽  
Accelerated Aging

Space Charge Characteristics of Epoxy Resin during Accelerated Aging Process

2020 ◽  
Author(s):  
Hongliang Zhang ◽  
Peng Liu ◽  
Hai Jin ◽  
Zhengqiang Liu ◽  
Kejian Chen ◽  
...  
Keyword(s):  
Space Charge ◽  
Epoxy Resin ◽  
Aging Process ◽  
Accelerated Aging

Comparative Study on Space Charge Distribution Measurements using PEA and PWP Methods on High Voltage Insulation

2013 ◽  
Vol 64 (4) ◽  
Author(s):  
N. A. Othman ◽  
M. A. M. Piah ◽  
Z. Adzis ◽  
N. A. Ahmad
Keyword(s):  
Space Charge ◽  
Charge Distribution ◽  
High Voltage ◽  
Electrical Breakdown ◽  
Accelerated Aging ◽  
Premature Aging ◽  
Internal Electric Field ◽  
Space Charge Distribution ◽  
Solid Insulator ◽  
Local Space

Major drawbacks to high voltage insulator especially on electrical aging process have been an issue for decades. The internal electric field distribution due to the presence of local space charge will distort, which in turn may cause the insulating material to degrade and finally can lead to accelerated aging and electrical breakdown. Comprehension of space charge buildup in solid insulator is crucial to determine how aging occurs, thus enabling the prediction of insulator lifetime. Space charge measurement has been extensively researched in recent years and has become a common method of investigating solid insulator properties. Pressure Wave Propagation (PWP) and Pulsed Electro-Acoustic (PEA) are non-destructive dielectric testing methods used to determine the space charge distribution within the insulation. This paper presents the basic principles, typical measurement setup and comparison of results from several published papers on application of PWP and PEA methods to investigate space charge accumulation. The space charge distribution in the sample is measured as current and voltage signals obtained from PWP and PEA methods respectively. Judging from extracted results of other research, both methods show the capability to detect premature aging activities in the insulator, which is necessary for condition monitoring of high voltage insulators.

Electron holography of interfaces in electroceramics

1993 ◽  
Vol 51 ◽  
pp. 1088-1089
Author(s):  
Vinayak P. Dravid ◽  
V. Ravikumar ◽  
Richard Plass
Keyword(s):  
Space Charge ◽  
Direct Evidence ◽  
Materials Science ◽  
Theoretical Work ◽  
Electron Holography ◽  
Resolution Limit ◽  
Interference Phenomenon ◽  
X Ray ◽  
Electron Sources ◽  
Science Community

With the advent of coherent electron sources with cold field emission guns (cFEGs), it has become possible to utilize the coherent interference phenomenon and perform “practical” electron holography. Historically, holography was envisioned to extent the resolution limit by compensating coherent aberrations. Indeed such work has been done with reasonable success in a few laboratories around the world. However, it is the ability of electron holography to map electrical and magnetic fields which has caught considerable attention of materials science community.There has been considerable theoretical work on formation of space charge on surfaces and internal interfaces. In particular, formation and nature of space charge have important implications for the performance of numerous electroceramics which derive their useful properties from electrically active grain boundaries. Bonnell and coworkers, in their elegant STM experiments provided the direct evidence for GB space charge and its sign, while Chiang et al. used the indirect but powerful technique of x-ray microchemical profiling across GBs to infer the nature of space charge.

Phase-type gbatings induced by electro-optic effect of the space charge fluctuation in an ionic conductor

1983 ◽  
Vol 44 (12) ◽  
pp. 361-366 ◽  
Author(s):  
Shi-Jie Gu ◽  
Pin-Yuan Li
Keyword(s):  
Space Charge ◽  
Ionic Conductor ◽  
Charge Fluctuation ◽  
Electro Optic ◽  
Phase Type
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