Abstract
In this paper, the heat balance integral method was employed to solve the internal temperature of ice layer and the position of melting interface by stages, due to its main advantage of converting the governing partial differential equation to an ordinary differential one, which can effectively reduce numerical efforts. Then the deicing time of hot water for insulator was calculated and analyzed. Taking LXY-120 insulator as the verification object, after natural icing at Xuefeng mountain natural icing test base, the validation experiments of deicing time were carried out in the natural environment. The initial water temperature and outlet pressure were optimized for deicing efficiency. Finally, the leakage current of water jet was measured. The research results indicate that the deicing rate increases and the energy consumption gradually decreases as the initial temperature of hot water increases. As the outlet pressure increases, the deicing rate increases. For the deicing condition of 1.2 mm nozzle, ambient temperature of -1 °C, wind speed of 3 m/s, ice weight of 2 kg/piece and deicing distance of 2 m, when the initial temperature of hot water and outlet pressure are 85.21 °C and 3.35 MPa respectively, the comprehensive deicing efficiency is the highest. The leakage current through water jet decreases with the increasing distance. The leakage current increases with the increase of water conductivity and outlet pressure. Hot water deicing for insulator in 110 kV system can be carried out according to the safety distance of the existing regulation.
Highlights
Insulator plays an important role of electrical insulation and mechanical support in the transmission line, and its icing may cause ice flashover which would lead to the interruption of power supply [1]–[6]
Hot water deicing for insulators belongs to the melting process with phase change
This paper focuses on the deicing process on the insulator surface under hot water, and the deicing efficiency and safety distance of hot water deicing technology are discussed and analyzed
Summary
Insulator plays an important role of electrical insulation and mechanical support in the transmission line, and its icing may cause ice flashover which would lead to the interruption of power supply [1]–[6]. In literature [11], [12], the polynomial heat balance integral method is used to solve the temperature field in melting process of ice layer with semi-infinite and finite thickness, respectively. Z. Zhijin et al.: Hot Water Deicing Method for Insulators Part 2: Analysis of Ice Melting Process, Deicing Efficiency, and Safety Distance infrared deicing respectively. The influence of jet pressure, distance and ice temperature on the deicing efficiency was studied preliminarily. The deicing experiment of post insulator was carried out in literature [20] on the condition of hot water temperature of 50 ◦C, hot water speed of 15 m/s, ice thickness of 5 mm and the deicing distance of 50 cm. The research results provide theoretical support for revealing the influencing factors and mechanism of hot water deicing and the selection of deicing equipment parameters
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