Tuesday 8
B. Corona, Barrier and Surface Discharges
Chair: I. Adamovich, K. Satoh - Each talk is 10'+2' duration
› 11:20 - 11:30 (10min)
› Blaise
Study on Shed Cracks of Composite Insulators Used at 750kV AC lines in Strong Wind Area
Xilin Wang  1, *@  , Fu Hao  2  , Sheng Wang  3  , Zhenquan Zhang  2  , Mingliang Zhong  3@  , Zhengyi Zhu  1@  , Guoxiang Ma  1  , Zhidong Jia  1@  , Zhicheng Guan  1@  
1 : Graduate School at Shenzhen, Tsinghua University
2 : State Grid Xinjiang Electric Power Corporation
3 : Xinjiang Power Transmission & Engineering Compagny
* : Corresponding author

Composite insulators promoted development of ultra-high voltage transmission lines and study of the composite insulators is very important at the high voltage engineering. Strong wind area is very special environment at China or the worldwide. Not only the tower strength, conductor galloping and external insulation selection should be considered, but also the insulator structure and the shed materials need to be designed carefully. The sheds cracks of the composite insulators at 750kV AC lines in Xinjiang province is very new topic. It is found that when the wind speed is higher than 30 m/s, the biggest sheds of the tested insulator would vibrate at high frequency and great amplitude. The vibration of the sheds caused the sheds root load stress concentration, which is periodically. Even the stress was lower than the tensile strength of the HTV rubber, the stress fatigue would break the sheds root and the cracks would appear. To restrain the resonance between fluid and the shed, the shed structure parameter and the material used to make insulators sheds should be improved.  

 


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