Temperature-dependent surface charge behavior of polypropylene film under DC and pulse voltages

Du, B. X.; Zhu, Wenbo; Xing, Yunqi; Huang, P. H.

doi:10.1109/tdei.2017.006290

Cited by 21 publications

(13 citation statements)

References 25 publications

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“…Direct fluorination is an effective method of polymer surface modification, which regulates the surface’s mechanical and chemical properties by replacing the active hydrogen atoms with fluorine atoms, and is usually achieved in a gas mixture composited of F 2 with N 2 or O 2 [12]. Du et al investigated the effects of direct fluorination on the electrical properties of both outdoor and indoor insulators, and revealed that surface fluorination could reduce the accumulation of surface charges and improve the flashover voltage [13,14]. An et al obtained various types of temperature fluorinated silicone rubber, and found that there were two effects from the substitution reaction and fluorine diffusion during the fluorination process [15].…”

Section: Introductionmentioning

confidence: 99%

Surface Layer Fluorination-Modulated Space Charge Behaviors in HVDC Cable Accessory

et al. 2018

Polymers

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Space charges tend to accumulate on the surface and at the interface of ethylene–propylene–diene terpolymer (EPDM), serving as high voltage direct current (HVDC) cable accessory insulation, which likely induces electrical field distortion and dielectric breakdown. Direct fluorination is an effective method to modify the surface characteristics of the EPDM without altering the bulk properties too much. In this paper, the surface morphology, hydrophobic properties, relative permittivity, and DC conductivity of the EPDM before and after fluorination treatment were tested. Furthermore, the surface and interface charge behaviors in the HVDC cable accessory were investigated by the pulsed electroacoustic (PEA) method, and explained from the point of view of trap distribution. The results show that fluorination helps the EPDM polymer obtain lower surface energy and relative permittivity, which is beneficial to the interface match in composite insulation systems. The lowest degree of space charge accumulation occurs in EPDM with 30 min of fluorination. After analyzing the results of the 3D potentials and the density of states (DOS) behaviors in EPDM before and after fluorination, it can be found that fluorination treatment introduces shallower electron traps, and the special electrostatic potential after fluorination can significantly suppress the space charge accumulation at the interface in the HVDC cable accessory.

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Section: Introductionmentioning

confidence: 99%

Surface Layer Fluorination-Modulated Space Charge Behaviors in HVDC Cable Accessory

et al. 2018

Polymers

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“…Coupling complicates surface charge decay under the combination of DC and pulse voltages. Consequently, the electrical field, trap level, and density are asymmetrical with decay under different temperatures [115]. The space charges are resulted by ageing of dielectric materials only, i.e.…”

Section: ) DC With Ac Voltagementioning

confidence: 99%

Ageing: Causes and Effects on the Reliability of Polypropylene Film Used for HVDC Capacitor

Umran

Wang

2020

IEEE Access

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It is well-known that the high-performance polymeric dielectric films used for high-voltage DC capacitors should have outstanding capabilities in terms of electrical and mechanical properties in order to face harsh operating conditions. Many factors limit the ability of these thin films to face different and growing stresses according to modern electrical requirements. Microstructure properties, additives, impurities, defects formed during manufacturing as well as applied stress types significantly affect the performance of dielectric films and their operational lifetime. This paper presents a comprehensive review of the factors which affect the ageing, degradation and breakdown of metallised polypropylene (PP) capacitors films. The effects of microstructure, surface morphological properties, mechanical properties and defects on the reliability of biaxially oriented polypropylene films (BOPP) are studied. In addition, the phenomena affecting dielectric performance and ageing mechanisms which are induced by electrical, thermal and electrothermal stresses are discussed.

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“…The experimental setup as shown in figure 3 is employed to investigate the surface potential decay characteristics for the nanocomposites, for the positive and negative polarity of the applied voltage. The experimental setup used in carrying out the surface potential measurements is a widely adopted non-contact method of charging the test specimen, having the provision to test the insulating materials for different voltage profiles [12,19,29] and at different temperature ranges [30]. The needle plane configuration is used for charging the specimen.…”

Section: Surface Potential Measurements Under DC Voltagementioning

confidence: 99%

Investigation on the digital image correlation and charge trap characteristics of Al/epoxy nanocomposites

Chillu

Jayaganthan

Ramachandran

et al. 2020

Mater. Res. Express

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The influence of nanofiller on the tensile and surface charge properties of Al/Epoxy nanocomposite materials is investigated with respect to their structural composition. The formation of conductive network nearing the percolation limit with the addition of nanofiller has strongly influenced the mechanical and electrical characteristics of nanocomposites. The digital image correlation technique is employed to acquire the strain variation at the distinct locations on the tensile specimen. The loaddisplacement, as well as shape deformation, were analysed for the various nano filled composites. The improved tensile characteristics were achieved up to certain wt% of filler addition, beyond which the load and time required for the material fracture were reduced drastically. Likewise, the addition of filler up to 5 wt% has shown the improved charge decay characteristics viz. quicker charge decay and enhancement in shallow energy states under the applied DC voltage. The direct analogy in mechanical and electrical characteristics was formulated in terms of structural composition (defects, additives and filler) of respective materials.

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Temperature-dependent surface charge behavior of polypropylene film under DC and pulse voltages

Cited by 21 publications

References 25 publications

Surface Layer Fluorination-Modulated Space Charge Behaviors in HVDC Cable Accessory

Surface Layer Fluorination-Modulated Space Charge Behaviors in HVDC Cable Accessory

Ageing: Causes and Effects on the Reliability of Polypropylene Film Used for HVDC Capacitor

Investigation on the digital image correlation and charge trap characteristics of Al/epoxy nanocomposites

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