YANG Liming;XIE Shimin;WANG Zhong;CHEN Fufeng;XUE Mingjun;CHEN Zhong;

• 1:Guodian Nanjing Automation Co.
• 2:Ltd.
• 3:School of Electrical Engineering
• 4:Southeast University

Abstract：

The connected series-compensated capacitors alter the sequence network impedance of transmission lines and the distribution of sequence currents during faults. While this does not adversely affect the phase-selection elements on the capacitor installation side, it may lead to misidentification by those on the opposite side. To address this, a fault phase selection method based on line-mode phase current is proposed. First, the line-mode phase current is defined as the difference between the fault-component current of each phase and the zero-sequence current. Next, the characteristics of line-mode phase currents under different fault types are analyzed to extract distinctions between faulted and non-faulted phases, from which the phase-selection criterion is constructed. Finally, the method is validated through simulations on the PSCAD platform. The results show that the proposed method can accurately identify the faulted phase in series-compensated transmission lines, and its performance is robust with respect to fault location, line length, and the degree of series compensation.

Key Words： transmission lines;fault phase selection;series-compensated capacitor;fault components;sequence components

Abstract:

Keywords:

Foundation: 国家电网公司总部科技项目（5108-202218280A-2-276-XG）

Authors: YANG Liming;XIE Shimin;WANG Zhong;CHEN Fufeng;XUE Mingjun;CHEN Zhong;

DOI: 10.19585/j.zjdl.202603007

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