Modified model of AC flashover voltages of contaminated insulators with various shapes

Dong, Bingbing; Ge, Yibo; Wu, Ben; Jiang, Xingliang

doi:10.1016/j.epsr.2023.109188

Cited by 5 publications

(1 citation statement)

References 24 publications

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“…Zhang et al [13] simulated a DC porcelain insulator string model and discovered that the pollution on the lower surface of insulators influenced temperature rise obviously when the pollution was distributed unevenly on insulator surfaces. Dong et al [14] established a mathematical model of pollution flashover voltage, and predicted the flashover voltage of insulators with a different shape and leakage distance. Qiu et al [15] performed an AC artificial pollution flashover test and discovered that increasing shed spacing can improve the insulator pollution flashover characteristics.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Natural Pollution Accumulation Characteristics of Insulators for Railroads in High-Altitude Environment

Zhang,

Chen,

Jiang

et al. 2023

Energies

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Railway system insulators are affected by pollution, altitude, and other environmental situations during operation, which causes reduced electrical performance or even flashover accidents. These factors threaten the safety of railway operations in high-altitude areas. However, the natural contamination characteristics of a railroad in a plateau area is still unclear. In this study, a natural pollution accumulation test for railway insulators in a high-altitude area was carried out, and the distribution rules of nonsoluble deposit density (NSDD), equivalent salt deposit density (ESDD), NSDD/ESDD ratio, and nonuniformity (T/B) of the pollution distribution of the tested insulators were calculated. Meanwhile, the chemical compositions of the pollution from different test sites were analyzed. The differences of pollution accumulation between railway insulators and suspended insulators of a power system and the influencing factors were compared and analyzed by combining with a numerical simulation. The results show that the pollution level of railroad insulators is mainly distributed in level b and above. A pollution sample is mainly composed of sodium chloride, while the NSDD/ESDD ratio of pollution is mostly distributed from 0 to 5, with T/B value ranges from 1/0.62 to 1/1.76. The amount of insulator contamination is influenced by the location inside and outside the tunnel. Additionally, the pollution amount is influenced by the structure and type of insulators. Finally, this paper studies the creepage distance and structural height required by railway insulators in a plateau area according to the natural pollution accumulation characteristics of railway insulators, which can provide a reference for a railway electrical external insulation configuration in a high-altitude area.

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Section: Introductionmentioning

confidence: 99%