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

Vykhodtsev, Anton V.; Kordi, Behzad; Oliver, Derek R.

doi:10.1049/hve.2017.0038

Cited by 7 publications

(6 citation statements)

References 21 publications

(30 reference statements)

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“…By extracting FDS characteristic parameters, further diagnosis of the insulation health state of equipment can also be accomplished. [1][2][3][4][5]. However, the repeatability and accuracy of FDS parameters will be greatly affected by the arrangement of the electrode and dielectric sample.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

“…By extracting FDS characteristic parameters, further diagnosis of the insulation health state of equipment can also be accomplished. [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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

Shen

Yang

Tang

et al. 2021

IET Science Measure & Tech

View full text Add to dashboard Cite

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“…A computer model of the field pattern around the electrodes and sample can be further used to improve the accuracy of the compensation by considering fringing fields [18]. Studies have analysed the sensitivity of the method to error sources [19], and the correction of the geometric influence [20, 21], and have used this method to measure the complex permittivity of silicone rubber [22]. However, the ideal contact‐free situation has not been realised as the sample still needs to contact the lower electrode which will also probably lead to surface resistance and contact problems.…”

Section: Introductionmentioning

confidence: 99%

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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“…Among these electrodes, a type of electrode with the sample placed on the bottom electrode and separated by an air gap has attracted some attention [1]. The sensitivity of the error sources [5] and the correction of geometric influence [6，7] have been analyzed when using this method to determine the permittivity of the insulating materials. However, the ideal contact-free situation has not been realized as the sample still needs contact with the bottom electrode, which will also lead to surface resistance and contact poor problems if the sample is firm but not very flat.…”

Section: Introductionmentioning

confidence: 99%

Non-contact Method for Dielectric Response Measurements

Jing

Cheng

et al. 2020

2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE)

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The dielectric response measurement is an important technique to assess the properties of insulation materials. However, the widely used approach with contact between samples and electrodes can in some cases limit the accuracy of the measurement. In this paper, an easily fabricated design is introduced and used to perform non-contact measurements. Air-reference measurements, comparing the sample to an air-gap for improved calibration, are used for all measurements. Results obtained by contact and non-contact methods, and with the feedback of electrometer locked and unlocked are compared. The effect of the pressure applied by the electrode is also investigated for both non-contact and contact measurements. Results show that the non-contact method can be an alternative to reduce contact problems between the sample and electrodes. For air-reference measurements, the impedance measurement instrument should be forced to use the same reference component for the air and sample measurements. Results obtained by the non-contact measurements are less sensitive to the pressure compared to that by contact measurements.

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

Cited by 7 publications

References 21 publications

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

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

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

Non-contact Method for Dielectric Response Measurements

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