Polyimide Film for Generator Winding

2017 ◽  
pp. 15-56
Keyword(s):  
Electrical Properties ◽  
Water Absorption ◽  
Surface Charge ◽  
Breakdown Voltage ◽  
Dielectric Breakdown ◽  
Partial Discharge ◽  
Polyimide Film ◽  
Polyimide Films ◽  
Direct Fluorination ◽  
Voltage Frequency

Polyimide film is widely used in different areas due to its brilliant chemical and electrical properties. This chapter discusses effect of direct fluorination on surface charge and surface partial discharge of polyimide films. The influences of different fluorination time and voltage frequency are studied. The trap properties of polyimide film are analyzed. It is clear that the fluorination has changed the micro structure of the sample so that the trap property and the dissipation time are different. Further research focuses on the effects of water absorption on surface charge and dielectric breakdown of nanocomposite. The polyimide/Al2O3 film is selected as sample and the relation between water absorption and surface charge and breakdown voltage is discussed.

Polarity Effect and Dielectric Breakdown of Composite Ferroelectric Films as the Dielectric for Electrowetting Systems

2018 ◽  
Vol 281 ◽  
pp. 598-603 ◽  
Author(s):  
Wei Qiang Wang ◽  
Yan Su
Keyword(s):  
Thin Film ◽  
Electrical Properties ◽  
Breakdown Voltage ◽  
Dielectric Breakdown ◽  
Ferroelectric Thin Film ◽  
Ferroelectric Film ◽  
Ferroelectric Films ◽  
Dc Voltage ◽  
Voltage Polarity ◽  
Voltage Frequency

In this paper, we study the electrical properties and breakdown phenomena of BaTiO3/Teflon composite ferroelectric thin film in electrowetting systems. The experimental results showed that the electrowetting effect and the breakdown voltage depend on DC voltage polarity, and this polarity dependence is closely related to the thickness of the ferroelectric film. Under AC voltages, the breakdown voltage increased directly with voltage frequency. These results are useful for designing reliable EWOD devices with low operation voltages and high robustness.

Comparative Study on Partial Discharge Characteristic in Polymer-Nanocomposite as Electrical Insulating Material

2013 ◽  
Vol 284-287 ◽  
pp. 62-66
Author(s):  
Wan Akmal Izzati ◽  
Mohd Shafanizam ◽  
Yanuar Z. Arief ◽  
Mohamad Zul Hilmey Makmud ◽  
Zuraimy Adzis ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Polymer Nanocomposites ◽  
Dielectric Breakdown ◽  
Breakdown Strength ◽  
Partial Discharge ◽  
Specific Area ◽  
Polymer Nanocomposite ◽  
Insulating Material ◽  
Weight Percentage ◽  
Experimental Works

Polymer nanocomposites have been attracting attention among researchers as electrical insulating application from energy storage to power delivery. However, partial discharge has always been a predecessor to major faults and problems in this field. In addition, there are a lot more to explore as the characteristic of partial discharge in nanocomposites is not clearly understood as well as the electrical properties of the nanocomposites. By adding a few amount of weight percentage (wt%) of the nano fillers, the physical, mechanical and electrical properties of polymers can be greatly enhanced. This is due to its amazing characteristic of having large specific area as a consequential from its nano sized particle that could enhance the electrical properties of the insulator. For instance, nano fillers in nanocomposites such as silica (SiO2), alumina (Al2O3) and titania (TiO2), play big role in providing good approach to increase dielectric breakdown strength and partial discharge resistance of nanocomposites. Such polymer nanocomposites will be reviewed thoroughly in this paper based on previous experimental works and studies. This paper provides reviews from related publications from year 1997 to 2011 including the results of experimental works which have been conducted by the authors with main focus on partial discharge characteristics in polymer nanocomposites, which demonstrates that research and utilization of polymer nanocomposites has well developed from past decades and will possess a high demand in future as electrical insulating material.

Properties Of A Photoimageable Thin Polyimide Film II.

1991 ◽  
Vol 227 ◽  
Author(s):  
Taishih Maw ◽  
Richard E. Hopla
Keyword(s):  
Thin Film ◽  
Weight Loss ◽  
Electrical Properties ◽  
Dissipation Factor ◽  
Polyimide Film ◽  
Decomposition Temperature ◽  
Polyimide Films ◽  
Mechanical And Electrical Properties ◽  
Thermal And Electrical Properties ◽  
Cure Temperature

ABSTRACTThe polylmide synthesized from benzophenonetetracarboxylic dianhydride and alkyl-substituted diamines is inherently photosensitive at ≤365 nm, and a solvent soluble, negative-acting system can be formulated from the fully-imidized resin. The lithographic, thermal, mechanical, and electrical properties of the polyimide films have been characterized. This polyimide film shows good thermal, mechanical, and electrical properties, and a 1:1 aspect ratio is consistently achieved on 10 μm thick films. The thermal properties of the films were determined using TGA and TMA methods. The decomposition temperature was 527°C, the weight loss of the cured film at 350°C in nitrogen was 0.04 %/hour and the thermal expansion coefficient was 37 ppm/°C. The dielectric constant and dissipation factor of the film were 3.0 and 0.003 respectively at 4% humidity. The effects of hard-bake time, hard-bake temperature, nitrogen purge rate during heat treatment, and humidity on the thermal and electrical properties of the thin film were also examined, and are presented here. The rate of weight loss of the cured film increases when the rate of nitrogen purge decreases or when the cure temperature increases. Longer heat treatments resulted in a slight decrease in the CTE and an Increase in the Tg. The electrical properties of the films are dependent both on the humidity during measurement and on the hard-bake temperature.

scholarly journals Partial Discharge Characteristics of Polymer Nanocomposite Materials in Electrical Insulation: A Review of Sample Preparation Techniques, Analysis Methods, Potential Applications, and Future Trends

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Wan Akmal Izzati ◽  
Yanuar Z. Arief ◽  
Zuraimy Adzis ◽  
Mohd Shafanizam
Keyword(s):  
Electrical Properties ◽  
Power Systems ◽  
Polymer Nanocomposites ◽  
Dielectric Breakdown ◽  
Breakdown Strength ◽  
Partial Discharge ◽  
Analytical Techniques ◽  
Future Trends ◽  
Weight Percentage ◽  
Academic Review

Polymer nanocomposites have recently been attracting attention among researchers in electrical insulating applications from energy storage to power delivery. However, partial discharge has always been a predecessor to major faults and problems in this field. In addition, there is a lot more to explore, as neither the partial discharge characteristic in nanocomposites nor their electrical properties are clearly understood. By adding a small amount of weight percentage (wt%) of nanofillers, the physical, mechanical, and electrical properties of polymers can be greatly enhanced. For instance, nanofillers in nanocomposites such as silica (SiO2), alumina (Al2O3) and titania (TiO2) play a big role in providing a good approach to increasing the dielectric breakdown strength and partial discharge resistance of nanocomposites. Such polymer nanocomposites will be reviewed thoroughly in this paper, with the different experimental and analytical techniques used in previous studies. This paper also provides an academic review about partial discharge in polymer nanocomposites used as electrical insulating material from previous research, covering aspects of preparation, characteristics of the nanocomposite based on experimental works, application in power systems, methods and techniques of experiment and analysis, and future trends.

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