Effect of Ice Shedding on Discharge Characteristics of an Ice-Covered Insulator String during AC Flashover
Abstract
:1. Introduction
2. Experimental Setup and Procedures
3. Flashover Performance on an Ice-Covered Insulator
3.1. Icing State of an Ice-Covered Outdoor Insulator with and without Ice Shedding
3.2. Flashover Process of Ice-Covered Insulators with and without Ice Shedding
4. Time-Frequency Analysis of Leakage Current (LC) during Flashover Process
4.1. Temporal Variation of LC Components
4.2. Ratio of Harmonics to the Fundamental Component
5. Conclusions
- (1)
- Ice shedding restricts the extension of discharge arcs to the critical length for flashover, leading to VMF enhancement of about 17% from conditions of without ice shedding (VMF = 84 kVrms) to the occurrence of ice shedding (VMF = 98 kVrms).
- (2)
- Compared with a relatively easy initiation and stable occurrence of discharge arcs in shortest air gap on an ice-covered insulator without ice shedding, ice shedding restrains the initiation and formation of discharge arcs across ice-free regions. These arcs are characterized by an unstable propagating path, indeterminate arc shape and longer arc column.
- (3)
- The temporal variation of LC low-frequency components (the fundamental, 3rd, 5th and 7th harmonics) is well related to surface performance of an ice-covered outdoor insulator during AC flashover process, where the fundamental component indicates the melting process of the ice layer and the harmonic components accord with the discharge behaviors across ice-free areas.
- (4)
- Although VMF under ice shedding is higher than that without ice shedding, the fundamental component, 3rd, 5th and 7th harmonics under ice shedding overall show lower values and bigger fluctuation trends with the development of the flashover process.
- (5)
- The ratios of 3rd, 5th and 7th harmonics to the fundamental component are well in accordance with discharge characteristics of ice-covered insulators, where a relatively stable varying tendency can be determined for the without-ice shedding condition, but a significant fluctuation and indeterminate tendency for the ice shedding condition.
Author Contributions
Funding
Conflicts of Interest
References
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Li, X.; Zhou, M.; Luo, Y.; Wang, G.; Jia, L. Effect of Ice Shedding on Discharge Characteristics of an Ice-Covered Insulator String during AC Flashover. Energies 2018, 11, 2440. https://doi.org/10.3390/en11092440
Li X, Zhou M, Luo Y, Wang G, Jia L. Effect of Ice Shedding on Discharge Characteristics of an Ice-Covered Insulator String during AC Flashover. Energies. 2018; 11(9):2440. https://doi.org/10.3390/en11092440
Chicago/Turabian StyleLi, Xiangxin, Ming Zhou, Yazhou Luo, Gang Wang, and Lin Jia. 2018. "Effect of Ice Shedding on Discharge Characteristics of an Ice-Covered Insulator String during AC Flashover" Energies 11, no. 9: 2440. https://doi.org/10.3390/en11092440