Affiliations: College of Energy and Electrical Engineering, Hohai University, Nanjing, Jiangsu, China
Correspondence:
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Corresponding author: Baowen Liu, College of Energy and Electrical Engineering, Hohai University, Mailbox 466, Focheng west Rood NO.8, Nanjing 211100, Jiangsu, China. Tel.: +86 025 5809 9191; E-mail:liu_baowen@hhu.edu.cn
Abstract: For a good understanding of EHV GIS external
induced currents in multipoint grounding systems, generation mechanism,
distribution characteristics and influence factors analysis of the induced
currents have been proposed in this paper. According to the structural
characteristics of the multipoint grounding system, self and mutual
inductances in GIS were calculated by using Biot-Savart Law. Based on Lenz's
law, external flux balance equation of GIS was proposed, which can be used
to calculate the induced circuiting currents. And the composition of induced
currents in different locations of EHV GIS has
been analyzed. Furthermore,
3-D analytical models of GIS were established. And the finite element method
(FEM) was used to analyze the influence factors and the distribution
characteristics of induced currents. Not only the amplitude but also the
phase angles of the induced currents were analyzed in this paper.
