Surface charge decay on insulators in air and sulfurhexafluorid - part II: measurements

Kindersberger, J.; Lederle, C.

doi:10.1109/tdei.2008.4591215

Cited by 90 publications

(54 citation statements)

References 10 publications

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“…The tendency of triboelectrified particles to follow exponential functions has been already noted in other studies [8,18,19]. The conductivity of the microscope slides might be a cause for this charge compensation in our case [20,21]. To prove this statement, we covered the surface of the microscope slides with conductive paths as shown in figure 5.…”

Section: Influence Of the Surfacesupporting

confidence: 67%

Characterization of triboelectrically charged particles deposited on dielectric surfaces

Nesterov¹,

Löffler²,

Cheng³

et al. 2010

J. Phys. D: Appl. Phys.

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Abstract:A device for the measurement of q/m-values and charge degradation of triboelectrically charged particles deposited on a surface was developed. The setup is based on the integration of currents, which are induced in a Faraday cage by insertion of a solid support covered with charged particles. The conductivity of different particle supports was taken into account. The "blow-off" method, in which the particles are first deposited, and then blown off using an air stream, can be used for characterisation of triboelectric properties of particles relative to different surfaces.

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Section: Influence Of the Surfacesupporting

confidence: 67%

Characterization of triboelectrically charged particles deposited on dielectric surfaces

Nesterov¹,

Löffler²,

Cheng³

et al. 2010

J. Phys. D: Appl. Phys.

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“…47 In contrast, on hydrophobic polymers exhibiting low water permeability, such as COC, SPD is much slower, rendering other charge-dissipation mechanisms more relevant. Some more important ones are via ion exchange with the atmosphere, as induced by neutralization by ions from the ambient atmosphere, 77,78 by air circulation, 66 and by reduced pressure. 31,79 These processes may be linked to the adsorption and desorption of water from the atmosphere, 80 and they are probably most relevant to ionic charge at the surface produced by low frictional energies.…”

Section: Water As a Sink Of Chargementioning

confidence: 99%

Squeezing out hydrated protons: low-frictional-energy triboelectric insulator charging on a microscopic scale

Knorr¹

2011

AIP Advances

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Though triboelectric charging of insulators is common, neither its mechanism nor the nature of the charge is well known. Most research has focused on the integral amount of charge transferred between two materials upon contact, establishing, e.g., a triboelectric series. Here, the charge distribution of tracks on insulating polymer films rubbed by polymer-covered pointed swabs is investigated in high resolution by Kelvin probe force microscopy. Pronounced bipolar charging was observed for all nine rubbing combinations of three different polymers, with absolute surface potentials of up to several volts distributed in streaks along the rubbing direction and varying in polarity on μm-length scales perpendicular to the rubbing direction. Charge densities increased considerably for rubbing in higher relative humidity, for higher rubbing loads, and for more hydrophilic polymers. The ends of rubbed tracks had positively charged rims. Surface potential decay with time was strongly accelerated in increased humidity, particularly for polymers with high water permeability. Based on these observations, a mechanism is proposed of triboelectrification by extrusions of prevalently hydrated protons, stemming from adsorbed and dissociated water, along pressure gradients on the surface by the mechanical action of the swab. The validity of this mechanism is supported by explanations given recently in the literature for positive streaming currents of water at polymer surfaces and by reports of negative charging of insulators tapped by accelerated water droplets and of potential built up between the front and the back of a rubbing piece, observations already made in the 19th century. For more brittle polymers, strongly negatively charged microscopic abrasive particles were frequently observed on the rubbed tracks. The negative charge of those particles is presumably due in part to triboemission of electrons by polymer chain scission, forming radicals and negatively charged ions

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“…The increase in conductivity is even more significant with prolonged time of fluorination treatment and, therefore, allows any surface charges to decay away faster. Studies show that there are three mechanisms that govern surface charge decay, which are (1) bulk conduction, (2) conduction along the surface and (3) neutralization by ion present in the gas volume above the sample surface [14]. The neutralization by ion mechanism may deem insignificant as all tests are conducted at atmospheric pressure in a controlled environment, leaving the possibility of surface charge decay to be through bulk conduction or diffusion along the surface.…”

Section: Resultsmentioning

confidence: 99%

Mechanisms for surface potential decay on fluorinated epoxy in high voltage DC applications

Mohamad

Chen

Zhang

et al. 2014

2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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Abstract-Epoxy resin has been extensively used for decades as an insulation material in high voltage transmission systems. However, this insulation material does suffer from bulk and surface charging when used as insulating spacer, mainly in high voltage DC applications. By applying fluorination treatment, the surface of polymeric insulation is chemically treated and so modifies charge transport characteristics of the material. In doing so, excellent surface properties can be obtained without compromising the bulk characteristics of the polymeric insulation. In this paper, the authors investigate the surface potential decay performance of non-fluorinated and fluorinated epoxy resin samples. The surface decay performance of insulating material is a crucial parameter in dissipating accumulation of surface and bulk charge that can lead to premature breakdown of the insulating material. The epoxy samples were characterised by Energy Dispersive X-Ray (EDX) analysis to determine the changes in chemical composition of the samples before and after fluorination treatment. Surface potential decay measurement using positive corona discharging was then performed, followed by bulk DC conductivity measurement to further explain the mechanisms which govern the surface potential decay. The existence of surface-fluorinated layer on the treated samples had been found to play a major role in dictating the movement of charges away from the surface during the decay process. The influence of fluorination treatment on the decay mechanisms was discussed.

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Surface charge decay on insulators in air and sulfurhexafluorid - part II: measurements

Cited by 90 publications

References 10 publications

Characterization of triboelectrically charged particles deposited on dielectric surfaces

Characterization of triboelectrically charged particles deposited on dielectric surfaces

Squeezing out hydrated protons: low-frictional-energy triboelectric insulator charging on a microscopic scale

Mechanisms for surface potential decay on fluorinated epoxy in high voltage DC applications

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