Enhanced accuracy in dielectric response material characterization by air reference method

Xu, Xiangdong; Bengtsson, T.; Blennow, Jörgen; Gubanski, Stanislaw

doi:10.1109/tdei.2013.6518960

Cited by 13 publications

References 14 publications

(15 reference statements)

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Sensitivity analysis of a parallel‐plate method for measuring the dielectric permittivity of high‐voltage insulating materials

Vykhodtsev¹,

Kordi²,

Oliver

2017

High Voltage

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Ascertaining the dielectric character of polymeric insulation materials is of particular interest for comparative studies that use accelerated ageing and samples from decommissioned installations. In the case of polymeric samples, the possibility of physical deformation within the sample holder adds additional variability to comparative measurements. Using readily obtainable instrumentation, this study undertakes a systematic sensitivity analysis of a parallel-plate capacitance measurement approach for polymeric materials that only has one capacitance plate in contact with the sample, avoiding issues of sample deformation. The analysis demonstrates that the biggest contributor of uncertainty in the measurement of the relative permittivity and loss tangent is the precision with which the plate-plate and plate-sample separation is determined. The measurements show that the determination of loss tangent can be susceptible to uncertainties arising from electrical noise, but that these can be controlled further by utilising more refined instrumentation.

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Sensitivity analysis of a parallel‐plate method for measuring the dielectric permittivity of high‐voltage insulating materials

Vykhodtsev¹,

Kordi²,

Oliver

2017

High Voltage

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Non‐contact method to reduce contact problems between sample and electrode in dielectric measurements

Jing

Taylor

2020

High Voltage

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Dielectric response measurement is a widely used technique for characterising dielectric materials in terms of their capacitance and dielectric loss. However, the widely used approach with contact between samples and electrodes can in some cases limit the accuracy of the measurement. The authors introduce an easily realised electrode arrangement for non‐contact measurements, which avoids these contact problems. The performance of the electrode arrangement in terms of the edge effect is assessed. The non‐contact and contact methods are compared based on error‐sensitivity analysis and experimental results. Differences are studied further, with attention to contact pressure. The non‐contact method is also compared experimentally with the one‐sided non‐contact method. Air‐reference measurements, comparing the sample to an air‐gap for improved calibration, are used for all measurements. The results show that the non‐contact method can be an alternative to reduce contact problems between the sample and electrodes, although error sensitivity can be higher when the non‐contact method is used. The non‐contact method can decrease the influence of the pressure applied to the sample compared to the contact method, and can also reduce the problem of poor contact that can arise from the absence of pressure in the one‐sided non‐contact method.

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Contact‐free dielectric response measurement based on limit fitting by neural network

Shen

Yang

Tang

et al. 2021

IET Science Measure & Tech

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Frequency domain spectroscopy (FDS) is widely used in analysis of insulation condition of dielectric material. The traditional contact method is susceptible to the impact of the contact state between the test sample and the electrode, which is also difficult to ensure the accuracy and repeatability of the test results. Using the method of sputtering gold on the surface of the sample is an effective way to avoid this problem though, this processing method is time-consuming and high-cost. This paper presents a method based on limit fitting by neural network to realize contact-free dielectric response measurement, which can eliminate the distortion effect of the air gap introduced by the uneven surface of dielectric material. Cross linked polyethylene (XLPE) is chosen as the test object to verify this method: in the domain of frequency = 1-1000 Hz, comparing with the test results of sample treatment by gold sputtering, the average error of frequency domain spectroscopy data in traditional method is 10%, while the new method is only 1%. Meanwhile, this paper analyses the cause of the errors in each method. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Enhanced accuracy in dielectric response material characterization by air reference method

Cited by 13 publications

References 14 publications

Sensitivity analysis of a parallel‐plate method for measuring the dielectric permittivity of high‐voltage insulating materials

Sensitivity analysis of a parallel‐plate method for measuring the dielectric permittivity of high‐voltage insulating materials

Non‐contact method to reduce contact problems between sample and electrode in dielectric measurements

Contact‐free dielectric response measurement based on limit fitting by neural network

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