Comparison of pollution flashover performance of porcelain long rod, disc type, and composite UHVDC insulators at high altitudes

Yang, Lin; Hao, Yanpeng; Li, Licheng; Zhao, Yuming

doi:10.1109/tdei.2012.6215112

Cited by 55 publications

(8 citation statements)

References 14 publications

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“…This deepens our understanding of LC behaviour on insulators under HVDC conditions, at least at high altitudes, since published data of LC levels on in-service HVDC transmission line insulators are limited. Laboratory pollution flashover experiments for HVDC insulators do state that there is a higher probability of flashover occurrence at higher altitudes compared to that at sea level [10], [11], [12]. In this paper, the LC of a composite and glass string, configured in an inverted-V, has been measured with shunt resistors.…”

Section: Introductionmentioning

confidence: 99%

In-Situ Monitoring of Leakage Current on Composite and Glass Insulators of the Cahora Bassa HVDC Transmission Line

Roman¹,

Zyl²,

Parus³

et al. 2019

SAIEE Afr. Res. J.

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High voltage transmission line design requires careful insulator selection to ensure good operational performance. This paper reports on the in-situ measurements of leakage current (LC) on composite and glass insulators of the Cahora Bassa high voltage direct current (HVDC) transmission line in South Africa over a 6month period. The influence of temperature, humidity, dew, rain and the HVDC line's voltage and current on LC are investigated. The results show that the composite and glass insulator LC behaviour is similar, except in cases of high humidity or rain. At the commencement of rainfall and humidity (>90%), elevated LC levels are observed on glass insulators, while composite insulators demonstrate lower LC levels under these conditions. Under nominal weather conditions of no rain and low humidity, the LC measurements exhibit an almost square-wave behaviour with LC switching between lower (≈20 µA) and higher values (≈60 µA) with relatively short transitions on a daily basis. This phenomenon can be ascribed to condensation on the insulators, which is a primary determinant of the LC levels on contaminated insulators. The line current and voltage fluctuations do not influence the LC level.

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Section: Introductionmentioning

confidence: 99%

In-Situ Monitoring of Leakage Current on Composite and Glass Insulators of the Cahora Bassa HVDC Transmission Line

Roman¹,

Zyl²,

Parus³

et al. 2019

SAIEE Afr. Res. J.

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“…Numerous studies have found that the relationship between the DC pollution flashover voltage and SDD can be expressed as follows [29][30][31]:…”

Section: Fog Water Conductivitymentioning

confidence: 99%

Electrical Strength and Physicochemical Performances of HTV Silicone Rubber under Salt-Fog Environment with DC Energized

Zhang

Liang

et al. 2020

Polymers

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In recent years, the performances of rubber composite insulators, which operate in the coastal foggy regions, have attracted researchers’ concern because of the observation of their degradation. In this paper, salt-fog experiments with DC test voltage of high-temperature vulcanized (HTV) silicone rubber (SR) have been conducted. The electrical strength and material performances of samples with salt-fog treatment were focused on. The DC flashover voltage, hydrophobicity, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and dielectric parameter were investigated. It was found that the samples’ performances deteriorated after salt-fog treatment. The DC flashover voltage of HTV SR decreased in the salt-fog environment. The hydrophobicity of the material deteriorated and the static contact angle (CA) became small. Under the action of electric and thermal stress, the surface of samples after salt-fog treatment became rough and porous. The absorption peak of the hydrophobic groups decreased, indicating that the molecular chain of SR material was broken, and the filler was consumed, bringing down the arc resistance of the sample. The absorption of moisture further led to insulation performance loss and then reduced the electrical strength of the material. Degradation of physicochemical properties will eventually lead to a decline in electrical strength.

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“…The development of polymeric insulators intrigued the interest of researchers in this field due to the achievement of superior properties, such as light weight, high flashover voltages, resistance to contaminations, and high dielectric strength, as compared to ceramic insulators [1,2]. Polymers such as Ethylene Propylene Diene Monomer (EPDM), Polyamide, Silicone Rubber (SiR) and Ethylene-Vinyl Acetate (EVA) are being used for electrical, construction, dielectric, and outdoor/indoor high voltage applications due to their beneficial mechanical, electrical, thermal, and dielectric properties.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Hydrothermally Stressed Silicone Rubber/Silica Micro and Nanocomposite for the Coating High Voltage Insulation Applications

et al. 2021

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Silicone rubber is a promising insulating material that has been performing well for different insulating and dielectric applications. However, in outdoor applications, environmental stresses cause structural and surface degradations that diminish its insulating properties. This effect of degradation can be reduced with the addition of a suitable filler to the polymer chains. For the investigation of structural changes and hydrophobicity four different systems were fabricated, including neat silicone rubber, a micro composite (with 15% micro-silica filler), and nanocomposites (with 2.5% and 5% nanosilica filler) by subjecting them to various hydrothermal conditions. In general, remarkable results were obtained by the addition of fillers. However, nanocomposites showed the best resistance against the applied stresses. In comparison to neat silicone rubber, the stability of the structure and hydrophobic behavior was better for micro-silica, which was further enhanced in the case of nanocomposites. The inclusion of 5% nanosilica showed the best results before and after applying aging conditions.

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Comparison of pollution flashover performance of porcelain long rod, disc type, and composite UHVDC insulators at high altitudes

Cited by 55 publications

References 14 publications

In-Situ Monitoring of Leakage Current on Composite and Glass Insulators of the Cahora Bassa HVDC Transmission Line

In-Situ Monitoring of Leakage Current on Composite and Glass Insulators of the Cahora Bassa HVDC Transmission Line

Electrical Strength and Physicochemical Performances of HTV Silicone Rubber under Salt-Fog Environment with DC Energized

Investigation of Hydrothermally Stressed Silicone Rubber/Silica Micro and Nanocomposite for the Coating High Voltage Insulation Applications

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