Affiliations: [a] School of Electrical Engineering, Shandong University, Jinan, Shandong, China | [b] State key Lab of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing, China | [c] University of Strathclyde, Glasgow, UK
Correspondence:
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Corresponding author: Haoxi Cong, School of Electrical Engineering, Shandong University, Jinan, Shandong 250061, China. E-mail:conghaoxi@163.com
Abstract: An arc chain model of multi-field coupling dynamics
integrating the electromagnetic force, the thermal buoyancy force, the wind
load force and the air resistance force of the secondary arc is established,
and the motion equations of secondary arc for long-distance transmission
lines are constructed. In addition, the arc root model is established after
depth analysis of the formation and motion mechanism of the arc root, and
the method of selecting optimal length of the current element is proposed.
The motion trajectory and the arcing time of secondary arc are obtained with
the established arc chain model, and the simulation results are compared
with the experimental results to verify the validity of the proposed model.
What's more, the arcing time and its dispersion with different wind speed
and direction is calculated, and the results showed that the proposed arc
model can effectively take into account of the wind influence factor.
Finally the electromagnetic force, the thermal buoyancy and the wind load
which imposed on the arc are calculated with different secondary current and
wind speed, the results show that the wind load force has great influence on
the secondary arc and the arc column is affected more greatly by wind than
the arc root.
