Title :
Simulation of electrical tree initiation in XLPE cable insulation under DC field
Author :
Xiang Zhang ; Yang Xu ; Chao Duan ; Libin Hu ; Yanqun Liao ; Tingxi Sun ; Wuzhou Zhu
Author_Institution :
State Key Lab. of Electr. Insulation & Power Equip., Xi´an Jiaotong Univ., Xi´an, China
Abstract :
Real-time three dimensional simulations of the electrical tree initiation process in needle-plane geometry under DC field with practical parameters were conducted. The evolution of physical parameters in this dynamic process was presented. Three governing equations: the continuity equation, the transport equation and the Poisson equation, were used to describe charge injection and motion, and an iteration simulation method was proposed to characterize the reciprocal effect of electron injection and local field modification. During the simulation, the transferred energy was regarded as thermal energy, which diffuses and causes local temperature to increase. When a local temperature exceeds the pre-set threshold, partial thermal breakdown occurs, indicating electrical tree initiation. The temperature evolutions of the point right below the needle tip with time under different voltages reflect an apparent deterministic feature of the electrical tree initiation process.
Keywords :
Poisson equation; XLPE insulation; electric fields; power cable insulation; trees (electrical); DC electric field; Poisson equation; XLPE cable insulation; charge injection; continuity equation; dynamic process; electrical tree initiation; electron injection reciprocal effect; iteration simulation method; local field modification; needle plane geometry; physical parameters; transport equation; Electric fields; Equations; Insulation; Materials; Mathematical model; Needles; Space charge;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena (CEIDP), 2013 IEEE Conference on
Conference_Location :
Shenzhen
DOI :
10.1109/CEIDP.2013.6748253