Electric Field Distribution and AC Breakdown Characteristics of Polluted Novel Lightning Protection Insulator under Icing Conditions

Jiazheng Lu, Jianping Hu, Zhen Fang, Xinhan Qiao and Zhijin Zhang
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Jiazheng Lu: State Key Laboratory of Disaster Prevention & Reduction for Power Grid Transmission and Distribution Equipment, Disaster Prevention and Reduction Center of State Grid Hunan Electric Power Co., Ltd., Changsha 410007, China
Jianping Hu: State Key Laboratory of Disaster Prevention & Reduction for Power Grid Transmission and Distribution Equipment, Disaster Prevention and Reduction Center of State Grid Hunan Electric Power Co., Ltd., Changsha 410007, China
Zhen Fang: State Key Laboratory of Disaster Prevention & Reduction for Power Grid Transmission and Distribution Equipment, Disaster Prevention and Reduction Center of State Grid Hunan Electric Power Co., Ltd., Changsha 410007, China
Xinhan Qiao: School of Electrical Engineering, Chongqing University, Chongqing 400044, China
Zhijin Zhang: School of Electrical Engineering, Chongqing University, Chongqing 400044, China

Energies, 2021, vol. 14, issue 22, 1-11

Abstract: As a result of lightning strikes, pollution, and ice, overhead distribution wires might be short-circuited and trip. As a result, researchers have developed a new lightning protection composite insulator. There is still a need to test its pollution and icing performance. Based on the finite element and field test method, this paper studies the electric field distribution and AC (Alternating Current) breakdown characteristics of polluted novel lightning protection insulators under icing conditions. Firstly, the finite element calculated results show that this novel insulator’s electric field distribution is different from that of a conventional insulator. The locations with sizeable electric fields are located in the insulation section, and the electric field in the arrester section is tiny. In addition, when the insulator surface is covered with ice, there is an increase in the electric field along the surface and pin electrodes. Compared with the dry conditions, when there is an ice layer and icicle, electric field peaks increase by 48.85% and 46.08%, respectively. Secondly, the test results show that there are three types of arc paths in different pollution levels. The arc paths are related to ESDD (equivalent salt deposit density) under icing conditions. U f shows a downward trend with increased pollution levels, and the maximum flashover voltage is 2.70 times more than the minimum. Finally, four fitting methods are proposed in this paper. After comparing the goodness of fit of different functions, the quadratic function and negative power function with the constant term are recommended as empirical formulas for calculating flashover voltage of novel insulators under icing conditions in different pollution levels. The research results of this paper have a specific guiding role for the selection of the external insulation of transmission lines and structural optimization of novel insulators.

Keywords: AC breakdown characteristics; arresters; lightning protection insulator; electric field calculation; icing conditions (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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