Acoustic and optical methods for measuring electric charge distributions in dielectrics

Takada, Tatsuo

doi:10.1109/tdei.1999.9286758

Cited by 61 publications

(17 citation statements)

References 102 publications

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“…Converter transformers insulated with oil and paper must be able to withstand complex electrical stresses, including polarity reversal, pulses of direct current (DC) superimposed on alternating current (AC) pulses, and AC superimposed on DC pulses. , Excessive charges excited by the applied voltage are hindered by the interface barrier caused by EDL due to the scattering effect , and accumulated at the oil–paper interface. Therefore, it is necessary to explore EDL regulation methods to reduce the charge accumulation at the oil–paper interface under applied voltages and avoid possible partial discharge and insulation degradation.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, submicrometer measurement accuracy is required for the measurement of EDL. The existing space charge measurement methods, such as the pressure wave propagation (PWP) method, pulsed electro-acoustic (PEA) method, and Kerr photoelectric effect, cannot meet the resolution requirements for the measurement of EDL. − Recent years, with the development of scanning probe microscopy technology, some measurement methods are combined with atomic force microscopy (AFM) to obtain the surface morphology information and other property information simultaneously, such as electric force microscopy (EFM), magnetic force microscopy (MFM), scanning capacitance microscopy (SCM), kelvin probe force microscopy (KPFM), and so on. − KPFM is a powerful experimental means for further research on EDL at the oil–paper interface, the surface morphology of insulating paper and the local potential of EDL at the oil–paper interface can be obtained simultaneously with nanometer spatial resolution and millivolt potential resolution. − It provides potential to investigate the charge distributions in EDL on the scale of submicrometers.…”

Section: Introductionmentioning

confidence: 99%

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Probing and Modulation of the Electric Double Layer at the Insulating Oil–Paper Interface

Gao,

Chen,

et al. 2023

Langmuir

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Probing and Modulation of the Electric Double Layer at the Insulating Oil–Paper Interface

Gao,

Chen,

et al. 2023

Langmuir

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“…With an improved pulse source having an amplitude of 700 V, a full width of 4.6 ns, and a maximum repetition rate of 10 kHz, multiple space charge distribution measurements can be completed in a single AC voltage cycle. [157] Moreover, precise phase [60,143] Fast test speed/ High noise immunity/ Simplicity of the measurement cell/ Non-destructive [16] Low resolution [31,77] / Acoustic signal needs calibration [63,69] PWP Fast test speed/ High signal-to-noise ratio/ Non-destructive [144] Low resolution/ Pressure wave signal needs calibration [143] Optical Pockels effect Calculation of electric field using the change of optical refractive index to deduce charge signal [11,139] High spatial resolution/ Suitable for solid dielectric films [141,145] Destructive to the sample [139] Kerr effect High spatial resolution/ Suitable for liquids [146] Thermal TPM Thermal diffusion disturbs charge and induces electrical signal [56,140] Non-destructive/ Suitable for thin samples [147] Low resolution/ Sensitivity and resolution are strongly related to spatial position TSM Non-destructive/ Suitable for thick samples [148] LIMM Three-dimensional electric field distribution can be provided…”

Section: Acoustic Methodsmentioning

confidence: 99%

“…[56,140] Acoustic methods, such as the PEA and PWP methods, have been used extensively. [56,141] In particular, the PEA method is widely used in space charge measurements in various polymer dielectric systems. [56,59,142] However, PEA has a limitation of low space resolution in thin films due to the response of piezoelectric sensors and pressure waves.…”

Section: Experimental Techniques Of Interface Chargesmentioning

confidence: 99%

Interface Charge Characteristics in Polymer Dielectric Contacts: Analysis of Acoustic Approach and Probe Microscopy

Wang

et al. 2023

Adv Materials Inter

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Interfaces are essential components in polymer contact systems, which widely exist in electronic devices and power equipment. Interface charge originating from the mismatch of the electronic structure in interfaces is one of the key issues to modify the device performance due to its multifunctional migration and accumulation behaviors. Hence, the detection and analysis of the interface charge characteristics are of great importance to deeply understand the polymer contact system in various devices. This paper presents an overview of recent research progress in the interface charge properties at dielectric interfaces. Based on the theoretical analysis of the MWS polarization and electronic localized states, two typical approaches of discussing the interface charges from micrometer to millimeter are mainly studied. Acoustic method is prevalent in detecting the space charge in various dielectrics. However, owing to its limited resolution (several µm), it is difficult to clarify the charge distributions at the interface with a micro‐scale. Probe microscopy presents a promising technique due to its flexible surface potential detection at a submicron scale. The challenges and prospects of acoustic and probe microscopy methods are discussed in this paper. The advanced techniques of interface charges can promote the development of new energy electronic devices.

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“…At 50 Hz #B, doped with inorganic oxides and, thus, affected by an increased amount of internal interfaces, may accumulate much more space charge and present larger dielectric losses than #A, which can worsen life performance of such material. On the contrary, at 10 kHz space-charge accumulation, as well as interfacial and dipolar polarization losses, could be significantly reduced (literature shows evidence of a decrease of space charge build up as frequency increases [41]), while PD (corona) activity is largely increased with respect to 50 Hz. Hence, corona resistant materials may last longer than the standard one.…”

Section: High Frequency Harmonics On Twisted Pairsmentioning

confidence: 98%

The effect of voltage distortion on ageing acceleration of insulation systems under partial discharge activity

Fabiani¹,

Montanari²

2001

IEEE Electr. Insul. Mag.

112

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Power electronic equipments are the main responsible for harmonic pollution of AC-electrical plants. In particular, Adjustable Speed Drives (ASD) affect both the AC-supply network and electrical motor supply voltage. A significant reliability reduction of equipment insulation fed by distorted voltage waveforms has been observed since 1950, but only recently voltage distortion effects on insulation have been deeply investigated. However, it is doubtful that the limit for power quality fixed by IEEE and IEC standards [1-3], which regard voltage and current rms distortion, can really improve electrical insulation reliability. Mostly, emphasis is put on current distortion, since accelerated aging is related to overheating caused by power loss increase [4][5][6][7][8]. Only recently the effect of voltage distortion on insulation system performance has been highlighted [9-12], focusing on cables and capacitors.Historically, investigations of the effect of voltage and current distortion on insulation degradation started from the harmonics injected in the AC distribution network by distorting loads [13], typically low-order harmonics (from 3 rd to 21 st order, i.e. having frequency from 3 to 21 times the fundamental one). Most of the work of the previous decade, in fact, was referred to transformers, rotating machines, cables and capacitors subjected to supply voltage distortion [5,6].The recent large diffusion of Adjustable Speed Drives (ASD) has brought significant attention to another possible cause of loss of insulation reliability, i.e. the steep waveforms generated by AC/AC converters using fast electronic switches (as MOS-FET or IGBT), e.g. [14][15][16][17][18][19][20][21][22][23]. These inverters generate width-modulated pulse trains with very high slew rate (up to 50 kV/us) and frequency (10-50 kHz). Electrical machines with insulation designed for supply frequency (50-60 Hz) have shown premature breakdown due to these periodic supply pulses, so that work is being

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Acoustic and optical methods for measuring electric charge distributions in dielectrics

Cited by 61 publications

References 102 publications

Probing and Modulation of the Electric Double Layer at the Insulating Oil–Paper Interface

Probing and Modulation of the Electric Double Layer at the Insulating Oil–Paper Interface

Interface Charge Characteristics in Polymer Dielectric Contacts: Analysis of Acoustic Approach and Probe Microscopy

The effect of voltage distortion on ageing acceleration of insulation systems under partial discharge activity

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