Effective area of thin guarded electrode in determining of permittivity and volume resistivity

Lisowski, M.; Skopec, A.

doi:10.1109/tdei.2009.4784548

Cited by 22 publications

(17 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When 1 M LiCF 3 SO 3 in γ-butyrolactone (GBL) was applied as one of common electrolyte solutions, the coloring reaction even progressed to the open circuit region after applying the voltage in 30 s. We suspected that bleeding was caused by (1) electron self-exchange in the polymer and/or (2) charge transfer through the ITO substrate ( Figure 5 b) because they were the main processes for organic-based electrodes [ 7 ]. The “fringing effect” of the electric field [ 41 ] could not be the main reason for the smudging ( Figure S1 , see Supplementary Materials for further discussion).…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Dimethyl-Substituted Polyviologen and Control of Charge Transport in Electrodes for High-Resolution Electrochromic Displays

et al. 2017

View full text Add to dashboard Cite

Electrochromic (EC) polymers such as polyviologens have been attracting considerable attention as wet-processable electrodes for EC displays, thanks to their brilliant color change accompanied with reversible redox reactions. To establish wider usage, achieving multicolor and high-resolution characteristics is indispensable. In this paper, we demonstrated that the introduction of substituents such as methyl groups into bipyridine units changed the stereostructure of the cation radicals, and thus shifted the color (e.g., ordinary purple to blue). Also, by relaxing excessive π-stacking between the viologen moieties, the response rate was improved by a factor of more than 10. The controlled charge transport throughout the polyviologen layer gave rise to the fabrication of EC displays which are potentially suitable for the thin film transistor (TFT) substrate as the counter electrodes with submillimeter pixels. The findings can be versatilely used for the new design of polyviologens with enhanced electrochemical properties and high-resolution, multicolor EC displays.

show abstract

Section: Resultsmentioning

confidence: 99%

Synthesis of Dimethyl-Substituted Polyviologen and Control of Charge Transport in Electrodes for High-Resolution Electrochromic Displays

et al. 2017

View full text Add to dashboard Cite

show abstract

“…as suggested in IEC 60093 [1,4], a fringing parameter B depending on g/h TS , B(g/h TS ) [14,15]. It is concluded that in the case of conductivity measurements and circular electrodes, the effective area may simplified be corrected applying Amey's [9] findings.…”

Section: Field Distribution In Guarded Electrode Setupsmentioning

confidence: 99%

“…Therefore, in 2006 and 2009, Lisowski ([14, 15]) published recommendations for changes of the IEC 60093. Based on analytical calculations and under consideration of various research works, electrode area corrections for several measurement arrangements for resistivity/conductivity and capacitance/permittivity determination are derived and presented in [14, 15]. It is concluded that in the case of conductivity measurements and circular electrodes, the effective area may simplified be corrected applying Amey's [9] findings.…”

Section: Conductivity Measurement: Setups Fringing Effects and Inmentioning

confidence: 99%

See 1 more Smart Citation

Model‐based accuracy enhancements for guarded conductivity measurements: determination of effective electrode areas utilising numerical field simulation

Freye

Jenau

2018

High Voltage

View full text Add to dashboard Cite

Methods utilising current measurements for conductivity and permittivity determination require precise knowledge of the effective electrode area in order to obtain accurate results. Owing to field distortions (e.g. caused by fringing) in guarded electrode setups, the effective electrode area differs significantly from the geometrical calculated. Focusing on guarded electrode setups for conductivity determination, a generic method based on numerical field simulation is presented allowing a convenient determination of the relevant effective electrode area. For this purpose, a brief overview of yet existing normative guidelines and related research work is provided. State-of-the-art conductivity measurement setups are presented in order to identify parameters which affect the field distribution within the measurement arrangements. The description of the implemented method and its realisation in COMSOL multiphysics is followed by its validation using analytical fringing calculations. Furthermore, presented method is used for the evaluation of fringing effects and additional field distortion caused by design aspects of the measurement cell itself and potential imbalances related to the measurement setup. Moreover, dependencies on conductivity of the surrounding environment are considered. Achieved model-based accuracy enhancements are calculated and are leading to a gain in precision for conductivity determination of up to 25% compared to yet existing approaches.

show abstract

“…It shows that low pressure electrode as low as, 0.36 N/cm 2 , is not enough to prevent a thin oil layer that present on surface which could influence the result of the measurements. For electrode with pressure higher than 1.91 N/cm 2 , the capacitance measured (therefore relative permittivity) were almost the similar.However, we have to take notice that too much pressure (from one massive electrode), usually, do not properly adhere to stiff dielectrics and may cause measuring errors [27]. …”

Section: Pressure Of Electrodementioning

confidence: 99%

Considerations for Dielectric Properties Measurements of Oil Immersed Pressboard

Pratomosiwi¹,

Pattanadech²,

Wieser³

et al. 2012

ijeei

View full text Add to dashboard Cite

Dielectric properties including relative permittivity, dielectric dissipation factor (DDF) and dc resistivity has been used widely as a design parameter of insulation system. In measuring dielectric properties of oil immersed material (OIM), we have to make some adaptations from IEC 60093 and IEC 60250.This paper is focused on dielectric properties measurement of oil immersed pressboard (OIP) i.e. related to the effect of live electrode corner shape, the effect of electrode's weight, and the applied the electric field stress and temperature.In this experiment, the solid and liquid dielectric wereoil immersed transformer board type B 3.1A and operated under mineral oil bath, Nynas Nytro 4000x. We concluded that, round-cornered electrode yields steep electric field enhancement at the oil side. This phenomena makes it easier to generate oil discharge in the wedgewhen compared to sharp-cornered electrode. For measuring dielectric properties at high voltage level, this phenomenon should take into account. It was also found that electrode with pressure higher than 1.9 N/cm2 gives enough pressure to prevent a thin oil layer that present on surface.We also notice that for small g h ⁄ ratio (the gap of guard and guarded electrode is small compared to the sample) or thick sample, the fringing effect is high. Therefore calculation of effective area according to IEC 60093 is considerably applicable for thick sample. These results could be used as a consideration when measuring dielectric properties of oil immersed pressboardin compliment with IEC 60093 and IEC 60250.

show abstract

Effective area of thin guarded electrode in determining of permittivity and volume resistivity

Cited by 22 publications

References 3 publications

Synthesis of Dimethyl-Substituted Polyviologen and Control of Charge Transport in Electrodes for High-Resolution Electrochromic Displays

Synthesis of Dimethyl-Substituted Polyviologen and Control of Charge Transport in Electrodes for High-Resolution Electrochromic Displays

Model‐based accuracy enhancements for guarded conductivity measurements: determination of effective electrode areas utilising numerical field simulation

Considerations for Dielectric Properties Measurements of Oil Immersed Pressboard

Contact Info

Product

Resources

About