Influence of Pollution Degree on Impact Flashover Characteristics of Insulator

The flashover characteristics of polluted insulators under lightning impulse and switching impulse are simulated in laboratory. It is found that when the gray density value is fixed, the flashover voltage begins to saturate under the shielding failure voltage while the salt density value reaches 0.1...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2019-12, Vol.358 (5), p.52074
Main Authors: Chao, Yafeng, Zhang, Liu, Wang, Cheng, Huang, Fuyong, Duan, Jianjia, Yue, Yishi, Liu, Sanwei
Format: Article
Language:English
Subjects:
Density
Electric potential
Flashover
Insulators
Shielding
Voltage
Waveforms
Online Access:Get full text
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Summary:The flashover characteristics of polluted insulators under lightning impulse and switching impulse are simulated in laboratory. It is found that when the gray density value is fixed, the flashover voltage begins to saturate under the shielding failure voltage while the salt density value reaches 0.1∼0.15mg/cm2 And the salt density saturation point under the counterattack voltage waveform is earlier than that under the counterattack voltage waveform, around 0.02mg/cm2. When the gray density value is fixed, under the counterattack voltage waveform, the flashover voltage decreases slightly in the gray density of 0.05mg/cm2 to 0.10 mg/cm2 range, and the flashover voltage begins to rise with the increase of gray density. Under the shielding failure waveform, the flashover voltage always decreases in the gray density of 0.05mg/cm2 to 0.20mg/cm2range, and begins to rise gradually after the gray density exceeds 0.20mg/cm2.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/358/5/052074