NDLI: Influence of protrusions on the positive switching impulse breakdown voltage of sphere-plane air gaps in high-altitude areas

Content Provider	IET Digital Library
Author	Lv, Fangcheng Geng, Jianghai Qin, Yuchen Ding, Yujian Yao, Xiuyuan Zhou, Songsong Wang, Ping
Abstract	The construction of ultra-high-voltage direct-current power transmission projects in high-altitude areas calls for the research into the discharge characteristics of the air gaps in the valve hall of a power converter station in such areas. Tests on the switching impulse discharge characteristics of the sphere-plane air gap were conducted at Yangbajing test base (Tibet, China) at an altitude of 4300 m on conditions that there were burrs on the 1.3 m diameter shield balls. The discharge characteristics, under the influences of burrs with different lengths and locations, were obtained and compared with test data from low-altitude areas. The results indicate that the arrangements of burrs with different lengths and locations can significantly reduce the switching impulse discharge voltage of sphere-plane air gaps, while the voltage sag gradually decreased down with increasing burr length. Moreover, the larger the sphere-plane air gap is, the smaller the influence of such burrs have. High altitude also substantially decreased the switching impulse discharge voltage of the air gap. When the surface of shield balls was smooth, the U50 saturation of the air gap was more significant than at low altitude; however, if there were burrs on the shield balls, the saturation effect was less significant.
Starting Page	499
Ending Page	504
Page Count	6
ISSN	17518822
Volume Number	14
e-ISSN	17518830
Issue Number	Issue 4, Jun (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-smt/14/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-smt.2019.0184
Journal	IET Science, Measurement & Technology
Publisher Date	2019-12-05
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	50% Breakdown Voltage Saturation Air Gap Burrs D.C. Transmission Dielectric Breakdown And Discharges Discharges (electric) Electric Breakdown High Altitude High-altitude Areas Low Altitude Low-altitude Areas Positive Switching Impulse Breakdown Voltage Power Converter Power Supplies to Apparatus Power Supply Quality Protection Apparatus Size 1.3 M Size 4300.0 M Sphere-plane Air Gap Statistics Switching Impulse Discharge Characteristic Switching Impulse Discharge Voltage Ultra-high-voltage Direct-current Power Transmission Projects
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electrical and Electronic Engineering

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