Review and Mechanism of the Thickness Effect of Solid Dielectrics

Zhao, Linjie; Liu, Chun Liang

doi:10.3390/nano10122473

Cited by 23 publications

(23 citation statements)

References 66 publications

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“…The above formula is identical to that in (31), where α = 6 and β = 6. The field E l for liquid breakdown in ( 3) is identical to that in (31), where α = 3 and β = 10. The field…”

Section: A Support From Awrementioning

confidence: 83%

“…The expression in (23) has been verified by a number of experiments [31], [32]. For gas, liquid, vacuum, breakdown, and vacuum surface flashovers, it is assumed that the characteristic field also conforms to the field described in (23) when the vacuum gap (g v ) or gas gap (g), vacuum electrode area (A v ), the area of the liquid…”

Section: A Effects Of Number Of Dimensions and Timementioning

confidence: 89%

“…Thus, (34) for the field E s of a solid dielectric is identical to that in (31), with α = 5 and β = 8.…”

Section: B Support From Nintmentioning

confidence: 95%

“…A number of experimental results and empirical formulas from both the AWRE and the NINT support (31). The empirical formulas due to the AWRE are first reviewed, followed by the theoretical formulas in the NINT.…”

Section: Support For Unified Formulamentioning

confidence: 99%

“…The above formula represents the breakdown field E v of a vacuum, which is identical to that in (31) with α = 6 and β = 3. Similarly, if the effect of pulsewidth is considered for the effect of electrode area on E v in ( 14) and τ is replaced with t e , we get…”

Section: B Support From Nintmentioning

confidence: 99%

See 4 more Smart Citations

A Unified Formula for Five Basic Forms of Discharge in an Electric Field Under Short Pulses

Zhao

2022

IEEE Trans. Plasma Sci.

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This study proposes a unified formula for five basic 1 forms of discharge-gas, liquid, solid, and vacuum breakdown, 2 and vacuum surface flashover-under short pulses in an electric 3 field. This formula considers the effects of the number of 4 dimensions and pulsewidth on the electric field. It is verified by 5 using the results of experiments reported at the Aldermaston 6 Weapon Research Establishment (AWRE) and the Northwest 7 Institute of Nuclear Technology. The ranges of application of this 8 formula to different discharge forms are also summarized. The 9 proposed formula can be used to transform experimental data 10 at a small scale under a known pulsewidth into those at a large 11 scale under the application pulsewidth and is thus important for 12 designing insulation.

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“…The above formula is identical to that in (31), where α = 6 and β = 6. The field E l for liquid breakdown in ( 3) is identical to that in (31), where α = 3 and β = 10. The field…”

Section: A Support From Awrementioning

confidence: 83%

Section: A Effects Of Number Of Dimensions and Timementioning

confidence: 89%

“…Thus, (34) for the field E s of a solid dielectric is identical to that in (31), with α = 5 and β = 8.…”

Section: B Support From Nintmentioning

confidence: 95%

Section: Support For Unified Formulamentioning

confidence: 99%

Section: B Support From Nintmentioning

confidence: 99%

See 3 more Smart Citations

A Unified Formula for Five Basic Forms of Discharge in an Electric Field Under Short Pulses

Zhao

2022

IEEE Trans. Plasma Sci.

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A Review of Polyolefin‐Insulation Materials in High Voltage Transmission; From Electronic Structures to Final Products

Bjurström,

Edin,

Hillborg

et al. 2024

Advanced Materials

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This review focuses on the use of polyolefins in high‐voltage direct‐current (HVDC) cables and capacitors. A short description of the latest evolution and current use of HVDC cables and capacitors is first provided, followed by the basics of electric insulation and capacitor functions. Methods to determine dielectric properties are described, including charge transport, space charges, resistivity, dielectric loss, and breakdown strength. The semicrystalline structure of polyethylene and isotactic polypropylene is described, and the way it relates to the dielectric properties is discussed. A significant part of the review is devoted to describing the state of art of the modeling and prediction of electric or dielectric properties of polyolefins with consideration of both atomistic and continuum approaches. Furthermore, the effects of the purity of the materials and the presence of nanoparticles are presented, and the review ends with the sustainability aspects of these materials. In summary, the effective use of modeling in combination with experimental work is described as an important route toward understanding and designing the next generations of materials for electrical insulation in high‐voltage transmission.

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Intrinsic AC Dielectric Breakdown Strength of Polyimide Films at the Extreme: New Breakthrough Insights on Thickness Dependence

Diaham,

Lambkin,

O'Sullivan

et al. 2023

Adv Materials Inter

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To date, the AC dielectric breakdown strength of polyimide (PI) films, as for most polymers, is understood to follow a thickness dependency with a measured power law exponent, n ≈ 0.5. However, this work experimentally demonstrates that the AC dielectric strength of PI films is quasi‐thickness independent. Evidence is presented showing that the thickness dependency described in the literature can be explained by an extrinsic failure mode, driven by partial discharges occurring at the dielectric‐oil‐electrode triple point. Triple points can be avoided by electrode encapsulation, which subsequently recovers a purely intrinsic failure mode for PI films over a large thickness range. Consequently, the AC dielectric strength of thick PI films is intrinsic and quasi‐thickness independent, at least for film thickness up to 60 µm. For the first time, a “theoretical” AC breakdown field for PI films is reported as ≈520 Vrms µm−1. Finally, the highest experimental breakdown field values are obtained here with 505 Vrms µm−1 and 705 Vµm−1 under AC and DC fields, respectively.

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Review and Mechanism of the Thickness Effect of Solid Dielectrics

Cited by 23 publications

References 66 publications

A Unified Formula for Five Basic Forms of Discharge in an Electric Field Under Short Pulses

A Unified Formula for Five Basic Forms of Discharge in an Electric Field Under Short Pulses

A Review of Polyolefin‐Insulation Materials in High Voltage Transmission; From Electronic Structures to Final Products

Intrinsic AC Dielectric Breakdown Strength of Polyimide Films at the Extreme: New Breakthrough Insights on Thickness Dependence

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