Fast space charge behavior in heat‐treated polypropylene films

Zheng, Feihu; Min, Gu; Dong, Jianxing; An, Zhenlian; Liu, Qingquan; Zhang, Yewen

doi:10.1002/app.42235

Cited by 8 publications

(8 citation statements)

References 27 publications

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“…This could be related with morphological changes taking place during isothermal poling at high temperature (thickening of crystallites, relaxation of biaxial orientation etc. [17]). For the high temperature space charge (ρ-) peak, a systematic shift of peak maximum to higher temperatures was observed, with this indicating that high temperature poling favored the filling of deeper traps [18].…”

Section: ) Case A: Parallel Samples and Variable Evaporation Ratementioning

confidence: 99%

Practical Notes on the Measurement and Interpretation of Thermally Stimulated Discharge Currents in Biaxially Oriented Polypropylene

Rytöluoto

Niittymaki

Lahti

2019

NORD-IS

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The measurement and interpretation of high-field thermally stimulated depolarization current (TSDC) of capacitor-grade biaxially oriented polypropylene (BOPP) films are investigated in order to facilitate the derivation of trap parameters. Two main relaxations associable with the glass transition and detrapping of space charge from deep traps are observed, and their dependence on the polarization/depolarization conditions are studied. The complex bipolar nature of the space charge relaxation makes the derivation of trap parameters challenging. Lastly, a brief attempt is made to correlate the TSDC features with morphology and other short-term dielectric properties.

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Section: ) Case A: Parallel Samples and Variable Evaporation Ratementioning

confidence: 99%

Practical Notes on the Measurement and Interpretation of Thermally Stimulated Discharge Currents in Biaxially Oriented Polypropylene

Rytöluoto

Niittymaki

Lahti

2019

NORD-IS

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“…These physical defects are formed by the local arrangement of molecular chains to act as carrier traps for the space charge. The behavior of space charges is totally different depending on the crystallinity degree of polymer films because the density and level of charge traps are related to the film microstructure [101], [102]. Therefore, higher crystallinity films showed more accumulation of homocharge and lower mobility as well as more deep traps [103].…”

Section: Space Charge and Self-healing Under Various Voltgae Wavementioning

confidence: 99%

“…The PEA method has applied to measure HVDC materials as well as to characterize insulators for DC and AC applications in general and also for the ageing cases [101]. The thermal method has three main types, thermal pulse method (TPM), thermal step method (TSM), and laser intensity modulation method (LIMM).…”

Section: Space Charge and Self-healing Under Various Voltgae Wavementioning

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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“…As for the effect of crystalline modification on electrical property, Zheng reported that the fast cooling process contributed to the generation of shallow trap level and higher mobility of the escaping charge in iPP films [ 25 ]. Dang simultaneously added elastomer and surface-modified ZnO nanoparticles into PP and obtained improved DC resistivity and space charge properties [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Crystalline Modification and Its Effects on Dielectric Breakdown Strength and Space Charge Behavior in Isotactic Polypropylene

Zhang

Zhou

et al. 2018

Polymers

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Adding nucleating agents (NAs) is one of the most efficient ways to obtain improved mechanical, optical, and thermal properties of isotactic polypropylene (iPP). While it is well appreciated that electrical property is critically affected by crystalline modification, the role between them remains unclear. Here, we address this issue by incorporating commercial α-NA and β-NA into iPP, both of which exhibit strong nucleation ability, e.g., reducing the size of crystalline agglomerates from 45.3 µm (Pure-iPP) to 2.5 µm (α-iPP) and 7.6 µm (β-iPP), respectively. Mechanical testing results show that while β-modification decreases the tensile strength a little, it does enhance the elongation at break (200%) and toughness (25.3% higher), relative to its unfilled counterparts. Moreover, a well-dispersed β-iPP system obtains a comprehensive improvement of electrical properties, including dielectric breakdown strength, space charge suppression, and internal field distortion under a high external field (−100 kV/mm) due to newly-generated deep charge trapping sites. This crystalline modification strategy is attractive for future development of many engineering insulating polymers.

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Fast space charge behavior in heat‐treated polypropylene films

Cited by 8 publications

References 27 publications

Practical Notes on the Measurement and Interpretation of Thermally Stimulated Discharge Currents in Biaxially Oriented Polypropylene

Practical Notes on the Measurement and Interpretation of Thermally Stimulated Discharge Currents in Biaxially Oriented Polypropylene

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

Crystalline Modification and Its Effects on Dielectric Breakdown Strength and Space Charge Behavior in Isotactic Polypropylene

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