Study on Bridge-Cable Grounding System Based on the Non-decoupling Nodal Admittance Matrix
Xu Xing1, Chen Xiangrong1, Du Zhendong2, Qiu Lifeng2
1. Zhenjiang Provincial Key Laboratory of Electrical Machine Systems College of Electrical Engineering Zhejiang University Hangzhou 310027 China; 2. Zhejiang Huayun Power Engineering Design Consulting Company Hangzhou 310000 China
Abstract：Due to the particularity of the bridge structure, the grounding method of the bridge-cable has become an important factor that determines the safety and reliability of the cross-sea transmission system. In this paper, considering the influence of the overhead installation environment, series impedance matrices and shunt admittance matrices of the bridge-cable system are derived; the non-decoupling form of the matrix is introduced to simplify the calculation of the nodal admittance matrix; the cascade formula of the same order and different order nodal admittance matrix are deduced, a matrix solution method for the steady-state calculation of the bridge-cable system is constructed. For the 220kV bridge-cable project of Zhoudai Bridge, the grounding method is studied. The results show that the maximum induced voltage amplitude of the cable sheath and earth continuity cable can reach 87.15V. The maximum circulating current amplitude of the cable sheath and earth continuity cable can reach 79.57A. The total power loss caused by the circulating current reaches 360.34kW. Connecting the impedance at the cross-bonding joint can effectively reduce the loss, and the loss reduction effect is the best when the impedance phase angle is 60°. The work done provides a new calculation method and engineering application reference for the research on the grounding method of the bridge-cable system.
徐星, 陈向荣, 杜振东, 裘立峰. 基于非解耦节点导纳矩阵的随桥电缆接地方式研究[J]. 电工技术学报, 2021, 36(17): 3664-3674.
Xu Xing, Chen Xiangrong, Du Zhendong, Qiu Lifeng. Study on Bridge-Cable Grounding System Based on the Non-decoupling Nodal Admittance Matrix. Transactions of China Electrotechnical Society, 2021, 36(17): 3664-3674.
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2021, Vol. 36 
