Electrical performance of 330-kV composite insulators with different shed configurations under icing conditions

Yin, Fanghui; Jiang, Xingliang; Farzaneh, M.; Hu, Jianlin

doi:10.1109/tdei.2015.005285

Cited by 30 publications

(21 citation statements)

References 24 publications

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“…The 50% lightning discharge voltage was experimentally analysed under gap distances ranging from 180 to 240 mm. The up-and-down test method was used in the experiment [13]. The time interval between the two impulses was a charging time of 70 s. The next test value was determined by the last test phenomenon.…”

Section: Experimental Platform and Samplementioning

confidence: 99%

Study on Impulse Breakdown Characteristics of Internal-Gap Lightning Protection Device Applied to 35 kV Distribution Line

Fang

Wang

et al. 2018

Energies

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External environmental factors have no effect on the breakdown performance of the internal gap, leading to the anti-icing and anti-storm features of the internal-gap lightning protection device (ILPD). In this paper, a test platform is created to study the impulse discharge and arc erosion characteristics of the ILPD applied to a 35 kV distribution line. The 50% lightning impulse voltage and discharge stability of the ILPD are experimentally analysed. The results show that the ILPD has good discharge voltage repeatability under multiple impulses. Under a positive lightning impulse, the 50% breakdown voltage of the ILPD is 3.8-11.4% higher than that of the outer-gap lightning protection device (OLPD). A finite element simulation model is created for electric field analysis. The maximum electric field strength of the ILPD is 4.68% lower than that of the OLPD, leading to a higher lightning breakdown voltage. High-speed camera shooting shows that the discharge arc may lead to the erosion of the discharge tube, reducing its insulation performance. A large current impulse test platform is set up for arc energy analysis, which indicates that more than 90% of the energy is absorbed by the varistor during lightning stroke. The quality and leakage current of the discharge tube did not change significantly after testing. Given the current design of varistors, the per unit length energy of arc is less than 4.5 J/mm due to the numerical calculation, which is far less than the experimental arc energy (25.0 J/mm). Therefore, arc erosion will not cause the insulation performance of discharge tube to decrease when using the current varistor design.

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Section: Experimental Platform and Samplementioning

confidence: 99%

Study on Impulse Breakdown Characteristics of Internal-Gap Lightning Protection Device Applied to 35 kV Distribution Line

Fang

Wang

et al. 2018

Energies

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“…Before spraying, the freezing water was pre-cooled to a temperature ranging from 3 to 4 °C. Wet-grown ice, known as the most dangerous ice type, was used in the flashover test in this paper [24].Energized icing process was used in this paper, and the applied voltage was set to 50 kV during the ice accretion period. The experimental parameters are shown in Table 2.…”

Section: Ice Accumulation Methodsmentioning

confidence: 99%

“…In order to simulate the pollution degree in most icing regions in china, the freezing water conductivity was fixed to 370 µS/cm [27,28]. Before spraying, the freezing water was pre-cooled to a temperature ranging from 3 to 4 • C. Wet-grown ice, known as the most dangerous ice type, was used in the flashover test in this paper [24]. Energized icing process was used in this paper, and the applied voltage was set to 50 kV during the ice accretion period.…”

Section: Ice Accumulation Methodsmentioning

confidence: 99%

“…According to the IEEE standard and the experimental experiences in existing studies, a series of flashover tests were applied in this paper [5,16,[21][22][23][24]. Energized icing was used, and the sequence of the test procedure is shown in Figure 4.…”

Section: Electric and Flashover Performance Evaluation Methodsmentioning

confidence: 99%

“…The artificial climate chamber has a diameter of 25 m and a height of 27.5 m. The minimum temperature in the climate chamber can be adjusted to −20 ± 1 • C. The spraying system consists of more than 10 fog nozzles, and the wind velocity regulating system is composed of more than 10 fans placed in a tapering box with a diffusing honeycomb panel. These facilities can meet the requirements of artificial wet growth ice deposit, which is known as the most dangerous ice type for the insulators [24]. …”

Section: Test Facilitiesmentioning

confidence: 99%

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Voltage Distribution and Flashover Performance of 220 kV Composite Insulators under Different Icing Conditions

Xie

Jiang

et al. 2018

Energies

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Abstract:Composite insulators are widely used in modern power systems to provide electrical insulation and mechanical support for transmission lines and substations. However, the insulation strength will decrease greatly under the combined conditions of ice-covering and contamination, and icing flashovers may take place under these serious conditions. In this paper, AC flashover tests of different artificially ice-covered 220 kV composite insulators were carried out in a multi-function artificial climate chamber under energized ice accumulation conditions. The test results indicate that, with the increasing of ice thickness, the flashover voltages decrease and tend to saturation. The icing flashover voltages can be increased by adding booster sheds, but excessive booster sheds can lead to lower flashover voltages under heavy icing conditions. The voltage distributions of the iced insulators were measured using experimental methods. The results show that, the air gaps withstand most of the applied voltage. The zinc oxide (ZnO) resistors that are contained in the insulators can influence the voltage distributions of the iced insulators, but have little affect on the icing flashover voltages. The work done in this paper can provide reference for the design and type selection of outdoor composite insulators in cold climate regions.

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Comparison of four commonly used high temperature vulcanized silicone rubber formulas for outdoor insulator and their regional adaptability

Lin

Wang

Yin

et al. 2019

J of Applied Polymer Sci

Self Cite

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High temperature vulcanized silicone rubber (HTVSR) insulators are widely used in transmission lines. In this article, four formulas [fumed silica and precipitated silica as reinforcing agent, alumina trihydrate (ATH) and alumina as flame retardant, and Fe2O3 and Fe3O4 as colorant] widely used in the production of HTVSR insulators were investigated by performing a series of laboratory experiments. The surface morphologies of silicone rubber, mechanical characterization (hardness, tensile property, and tear strength), electrical properties (volume resistivity, dielectric property, and breakdown strength), hydrophobicity and its transfer property, and thermal property of these four formulas were analyzed. According to the test results, the formula composed of fumed silica, Fe2O3 colorant, and alumina trihydrate (ATH) were excellent in mechanical properties because of more secondary structures, more bound rubber, and uniform dispersion. Therefore, it can be used in strong wind and bird pecking regions. Due to the absence of crystal water, the formula composed of fumed silica, Fe2O3 colorant, and alumina was observed to be excellent in thermal stability and electrical properties, making it suitable for the regions with high temperature and humidity. The formula composed of precipitated silica, Fe3O4 colorant, and ATH was found to be excellent in hydrophobicity transfer characteristics because of more raw rubber and satisfactory performance could be expected when it was applied in polluted regions. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47477.

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Electrical performance of 330-kV composite insulators with different shed configurations under icing conditions

Cited by 30 publications

References 24 publications

Study on Impulse Breakdown Characteristics of Internal-Gap Lightning Protection Device Applied to 35 kV Distribution Line

Study on Impulse Breakdown Characteristics of Internal-Gap Lightning Protection Device Applied to 35 kV Distribution Line

Voltage Distribution and Flashover Performance of 220 kV Composite Insulators under Different Icing Conditions

Comparison of four commonly used high temperature vulcanized silicone rubber formulas for outdoor insulator and their regional adaptability

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