Affiliations: [a] State Key Laboratory of Transmission and Distribution
Equipment and System Security and New Technology, School of Electrical
Engineering, Chongqing University, Chongqing, China | [b] Shandong Zibo Power Supply Bureau, Zibo, Shandong, China
Correspondence:
[*]
Corresponding author: Fan Yang, School of Electrical
Engineering, Chongqing University, Chongqing, 400030, China. Tel.: +86
13996289198; E-mail: [email protected]
Abstract: More and more ultra-high voltage (UHV) transmission line will be
built in China, and the design of external insulation is critical for the safe
operation of UHV transmission line. Air relative humidity (RH) and temperature
can affect its permittivity and electric field around the transmission line,
hence in the paper the numerical relationship between the electric field, air
permittivity and air temperature, RH is investigated by field measurement test
and numerical analysis. Firstly the measurement tests are setup to measure
electric field strength and atmospheric parameters, in which the electric
field, air temperature and RH at same measuring point are measured repeatedly
on different days. Then scatter plots are used to reflect the relationship
between field strength and temperature along with relative humidity
intuitively, and correlation analysis is conducted on the measurement data.
Finally the numerical model for the electric field and air RH &
temperature, numerical model for the air permittivity and air RH &
temperature are obtained. The results provide reference for UHV external
insulation design to improve their operation stability and performance.
Keywords: Power frequency electric field, air permittivity, temperature, relative humidity, correlation
