Tracking and erosion of HTV silicone rubber and suppression mechanism of ATH

Kumagai, Seiji; Yoshimura, Noboru

doi:10.1109/94.919930

Cited by 153 publications

(62 citation statements)

References 21 publications

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“…From the above results, it is believed that the ATH concentration in the HTV silicone liner could be influenced by the surface discharge activity. This interpretation agreed with conclusions that have already been proposed in the literature by several authors [28][29][30][31][32]. The FTIR analysis of the HTV liner extracted from a failed insulator also exhibited the formation of carbonyl units as revealed by the increase of the absorbance band centered at 1628 cm -1 (Figure 15 -zone ).…”

Section: Ftir Analysessupporting

confidence: 91%

“…This compound currently named ATH is used in the formulation of silicone to improve certain properties such as lower leakage currents, erosion-resistance or fireretardancy [28], [29]. Indeed, at temperatures exceeding 200 °C, the breaking of ATH molecules generates new chemical species such as water and alumina [30]. The comparison of the different FTIR analyses showed that the intensity of the OH bands was much smaller in the case of HTV liner after service conditions.…”

Section: Ftir Analysesmentioning

confidence: 99%

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Effects of electric partial discharges on the rheological and chemical properties of polymers used in HV composite insulators after railway service

Habas

Arrouy

Perrot³

2009

IEEE Trans. Dielect. Electr. Insul.

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The origin and the consequences of the electric failure of in-service composite hollow insulators used in railway transportation were investigated. Direct electrical measurements made it possible the detection of partial discharges (PD) and UV emissions allowed of identifying the location of the PD at the interface between metal braids and a silicone liner. To investigate the effects of the damaging PD activity, physicochemical properties of the different polymers were investigated and compared to new samples. The thermomechanical properties of the HTV and RTV silicones showed important alterations in the polymers structure. The chemical analyses of the silicones and nitrile rubber conducted using ATR-FTIR spectroscopy revealed that the polymers were oxidized after electrical failure. The results indicated that the ozone production and UV emission were due to the surface electrical activities. The breakdown of alumina trihydrate (ATH) in the inner HTV silicone liner demonstrated that undesired electrical discharges induced an significant increase of temperature and the formation of moisture in the air present in the hollow insulator. Laboratory artificial aging performed on the silicones and nitrile rubber showed similar degradation as in service. Further electrical experiments conducted on empty hollow insulators enabled the detection of internal PD located in micro-voids present in the adhesive used to bond the HTV silicone liner to the inner composite tube.

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Section: Ftir Analysessupporting

confidence: 91%

Section: Ftir Analysesmentioning

confidence: 99%

Effects of electric partial discharges on the rheological and chemical properties of polymers used in HV composite insulators after railway service

Habas

Arrouy

Perrot³

2009

IEEE Trans. Dielect. Electr. Insul.

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“…The filler material and quantity used have a significant influence on the properties of the final silicone rubber product, affecting such things as thermal conductivity, water absorption, hydrophobicity, leakage current development and erosion and tracking resistance [26,31]. Laboratory and field tests have revealed that an ATH filler content of 40 -60% by mass is satisfactory for silicone rubber materials used in outdoor applications [62].…”

Section: Name Of Groupmentioning

confidence: 99%

A comparative study of insulator materials exposed to high voltage AC and DC surface discharges

Heger

Vermeulen

Holtzhausen

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

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“…Most of the tracking and erosion resistance studies carried out on polymer insulation are under the AC voltage [6][7][8][9][10]. Under AC voltages, it is easier to understand the surface degradation effects due to arcing from the third harmonic content analysis of leakage current (LC) [7].…”

Section: Introductionmentioning

confidence: 99%

Tracking/Erosion Resistance Analysis of Nano-Al(OH)₃Filled Silicone Rubber Insulating Materials for High Voltage DC Applications

Kannan¹,

Sivakumar²,

Mekala³

et al. 2015

Journal of Electrical Engineering and Technology

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-HVDC technology has become popular as an economic mode of bulk power transmission over very long distances. Polymeric insulators in HVDC power transmission lines are affected by surface tracking and erosion problems due to contamination deposit, which pose a greater challenge in maintaining the reliability of the HVDC system. In addition, polymeric insulators are also naturally affected by aging due to various environmental stresses, which in turn accelerates the surface tracking and erosion problems. Research works towards the improvement of tracking and erosion resistance of polymeric insulators by adding nano-sized fillers in the base material are being carried out worldwide. However, surface tracking and erosion performance of nano-filled aged polymeric insulators for HVDC applications are not well reported. Hence, in the present work, tracking and erosion resistance of the nano Al(OH) 3 filled silicone rubber insulation material has been evaluated under DC voltages at different filler concentrations and aged conditions, as per IEC 60587 test procedures. Leakage current and contact angle measurements were carried out to understand the surface hydrophobicity. Moving average technique was used to analyze the trend followed by leakage current. Water aged specimen shows less tracking resistance when compared with thermal aged specimen. It is observed that nanofiller concentration of 5% is even sufficient to get better tracking/erosion resistance under DC voltages.

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Tracking and erosion of HTV silicone rubber and suppression mechanism of ATH

Cited by 153 publications

References 21 publications

Effects of electric partial discharges on the rheological and chemical properties of polymers used in HV composite insulators after railway service

Effects of electric partial discharges on the rheological and chemical properties of polymers used in HV composite insulators after railway service

A comparative study of insulator materials exposed to high voltage AC and DC surface discharges

Tracking/Erosion Resistance Analysis of Nano-Al(OH)₃Filled Silicone Rubber Insulating Materials for High Voltage DC Applications

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Tracking and erosion of HTV silicone rubber and suppression mechanism of ATH

Cited by 153 publications

References 21 publications

Effects of electric partial discharges on the rheological and chemical properties of polymers used in HV composite insulators after railway service

Effects of electric partial discharges on the rheological and chemical properties of polymers used in HV composite insulators after railway service

A comparative study of insulator materials exposed to high voltage AC and DC surface discharges

Tracking/Erosion Resistance Analysis of Nano-Al(OH)3Filled Silicone Rubber Insulating Materials for High Voltage DC Applications

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Tracking/Erosion Resistance Analysis of Nano-Al(OH)₃Filled Silicone Rubber Insulating Materials for High Voltage DC Applications