Factors Affecting the Discharge Characteristics of Rod-Rod Long Air Gaps at Different Altitudes

2018 3rd Asia Conference on Power and Electrical Engineering

能源学;电工学

Zhang, Hao^1 ; Duan, Yubing^1 ; Liu, Hui^1 ; Liu, Rong^1 ; Zhang, Yang^1 ; Zhou, Chao^1 ; Jia, Ran^1

State Grid Shandong Electric Power Research Institute, Jinan

250002, China^1

关键词: Air-gap discharges;    Discharge characteristics;    Discharge voltages;    Electrical equipment;    External insulations;    High voltage electrical equipment;    Impulse discharges;    Linear relationships;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/366/1/012061/pdf
DOI  :  10.1088/1757-899X/366/1/012061

来源: IOP

【 摘 要 】

The impulsive discharge characteristics of the air gap is one of the main bases for the design of the external insulation of high-voltage electrical equipment; meanwhile, air gap discharge characteristics at different altitudes have been of concern for a long time. In this paper, the impact discharge tests of rod-rod gaps at different altitudes were carried out to study the influences of elements such as electrode shape, voltage polarity, altitude and temperature. It can be found that, with the increase of the gap distance, the 50% impulse voltage of the switching impulse tends to be saturated, and the discharge characteristic curve can be fitted by exponential function. The 50% impulse voltage of the lightning impact and the gap distance shows a good linear relationship which can be fitted by the linear function. This is no direct relationship with temperature and altitude. The saturation tendency of switching impulse's 50% discharge voltage decreased with the decrease of temperature. With the increase of the altitude and the decrease of the 50% impulse discharge voltage, the polar effect of the air gap between the rod-rod and the rod-plate decreases. The results are of great reference value for Insulation configuration of electrical equipment in high altitude.