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

Heger, G.; Vermeulen, H.J.; Holtzhausen, J.P.; Vosloo, W.L.

doi:10.1109/tdei.2010.5448107

Cited by 54 publications

(24 citation statements)

References 23 publications

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“…Apart from chemical degradation of PDMS, cover/housing surface damage (cracking and erosion) by sand storm, acid rain, and electrical discharge is also a likely phenomenon. 30,42−47…”

Section: Resultsmentioning

confidence: 99%

Degradation and Stability of Polymeric High-Voltage Insulators and Prediction of Their Service Life through Environmental and Accelerated Aging Processes

Ghosh

Khastgir

2018

ACS Omega

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Polymeric composite insulators consisting of core fiber reinforced polymer insulators covered with polydimethylsiloxane (PDMS) housing are now replacing conventional ceramic insulators especially for high-outdoor power transmission lines due to some specific advantages. Unlike ceramics, polymers have relatively shorter life. Outdoor insulators experience different electrical, mechanical, chemical, and thermal stresses during service. The long-term service performance of these insulators and their service life estimation is an important issue, but it is complicated and time-consuming. The objective of the present investigation is to check the rate of property deterioration during service and to find the approximate lifetime. Working insulators with different ages were collected from service, and the changes in mechanical and electrical properties and hydrophobicity of the PDMS cover against aging time were measured. The service life estimated from the change in mechanical properties and surface hydrophobicity (using MATLAB software) was compared with the service life of a new compound subjected to accelerated aging tests. Prediction of service life is helpful for replacement of aged insulators from service to avoid interruption in power transmission.

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“…Apart from chemical degradation of PDMS, cover/housing surface damage (cracking and erosion) by sand storm, acid rain, and electrical discharge is also a likely phenomenon. 30,42−47…”

Section: Resultsmentioning

confidence: 99%

Degradation and Stability of Polymeric High-Voltage Insulators and Prediction of Their Service Life through Environmental and Accelerated Aging Processes

Ghosh

Khastgir

2018

ACS Omega

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“…The RMS AC voltages of 3.5 and 4.5 kV and corresponding flow rates of 0.3 and 0.6 ml/min were used in the tests. The DC voltages were chosen to be equal to the RMS AC voltages with the reasoning that the electrical damage in terms of tracking and erosion is energy-dependant and is determined by the RMS values [10]. For simplicity and limiting the number of variables, the CTV method was adopted for this experiment.…”

Section: Experimental Workmentioning

confidence: 99%

Comparative study of AC and DC inclined plane tests on silicone rubber (SiR) insulation

Kaaiye

Nyamupangedengu

2017

High Voltage

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Currently there are no international standards for evaluating the tracking and erosion resistance of DC polymeric insulation under contaminated conditions. Researchers often modify the existing AC inclined plane test standards such as the IEC-60587 to accommodate DC voltage conditions but this has been reported to give various inconsistences. This paper presents comprehensive experimental results on inclined plane tests of silicone rubber (SiR) insulation at 3.5 and 4.5 kV AC and positive DC using intravenous (IV) system as the pollutant supply. The leakage currents (LC) were recorded throughout the entire tests. In addition, various physiochemical tests namely, Fourier Transform Infrared analysis, thermo-gravimetric analysis, scanning electron microscopy and energy dispersive spectroscopy were performed on the aged and unaged samples. Results show that DC LC is bigger (about three times) than that under AC for the same equivalent voltages. Furthermore, DC LC variations are less random and the average magnitudes increase with duration of voltage application compared with AC. The physiochemical analyses show that 3.5 kV rms AC and 3.5 kV DC aged samples have comparable chemical characteristics albeit with electrode corrosion elements detected on the DC aged samples. Under 4.5 kV DC the degradation becomes significantly more severe and unrepeatable. It is therefore concluded that at 0.3 ml/min, pollutant flow rate, 3.5 kV positive DC and 3.5 kV rms AC are comparable as test voltages for inclined plane accelerated ageing of SiR insulation.

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“…with the applied voltage of 4.5 kV; this voltage level found to be most critical on material erosion [23]. Five different samples were studied by taking into consideration of dissimilar permittivity and electric conductivity as shown in Table 3.…”

Section: Analysis On Sample With Different Loading Nanofillermentioning

confidence: 99%

Modelling on Tracking Test Condition of Polymer Nanocomposite using Finite Element Simulation

2015

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

Cited by 54 publications

References 23 publications

Degradation and Stability of Polymeric High-Voltage Insulators and Prediction of Their Service Life through Environmental and Accelerated Aging Processes

Degradation and Stability of Polymeric High-Voltage Insulators and Prediction of Their Service Life through Environmental and Accelerated Aging Processes

Comparative study of AC and DC inclined plane tests on silicone rubber (SiR) insulation

Modelling on Tracking Test Condition of Polymer Nanocomposite using Finite Element Simulation

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