谐振接地系统断线不接地故障低频暂态分量分析

doi:10.19595/j.cnki.1000-6753.tces.250640

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Abstract After line break fault without earthing occurs in resonant grounding system, its transient process contains a wealth of high and low-frequency components. The existing research only considers high-frequency transient components, while the more significant low-frequency transient components have rarely been studied, and its low-frequency transient characteristic has not yet been related to conclusions. This study reveals the amplitude characteristics of low-frequency transient components and elucidates the influencing factors of low-frequency transient characteristics in line break fault without earthing within resonant grounding systems, addressing the theoretical gap in low-frequency transient behavior analysis for such fault scenarios.
First, the sequence network diagram for the line break fault without earthing in resonant grounding systems was established based on the fault boundary conditions. This model was simplified to derive an equivalent circuit suitable for low-frequency component analysis. Secondly, second-order linear nonhomogeneous differential equations are formulated from the equivalent circuit. Solving this equation yielded analytical expressions for the low-frequency transient zero-sequence currents in both the faulty line and healthy lines. Thirdly, the dominant resonant frequency and attenuation factor of the low-frequency transient components are systematically investigated. Key influencing factors (e.g., load capacitance, fault location) are identified, and their quantitative relationships with transient behavior are established. A comparative study is conducted between the transient characteristics of the aforementioned line break fault without earthing and single-phase high-impedance grounding faults. Finally, the correctness of the theoretical analysis is verified by simulation results.
The following conclusions can be drawn: (1) The amplitude of the zero-sequence low-frequency transient component is related to the line parameters, the distance from the fault point to the bus, and the downstream zero-sequence capacitance to ground of the fault point. The zero-sequence voltage at the bus and the zero-sequence currents on each line reach their maximum peaks within the first attenuation cycle, close to and less than twice the power-frequency component's peak value. (2) The dominant resonant frequency of the low-frequency transient component is determined by the compensation degree of the arc suppression coil. Notably, under over-compensation conditions, the system's dominant resonant frequency is observed to be slightly higher than the power frequency. The dominant resonant frequency is virtually unaffected by the attenuation factor, making the influence of fault location, line type, and load parameters negligible. (3) The attenuation factor of the low-frequency transient component is related to the fault distance and the load parameters of the faulty line. The attenuation factor varies with changes in the active and reactive power of the load. Furthermore, the greater the distance of the fault point from the bus, the smaller the damping factor becomes. Due to the larger zero-sequence capacitance to ground in cable lines compared to overhead lines, this variation becomes more pronounced in cable lines. (4) Generally, the attenuation factor of the zero-sequence low-frequency component in single-phase high-impedance grounding faults is significantly larger than that in line break fault without earthing.

Key words： Resonant grounding system line break fault without earthing low-frequency component transient analysis

Received: 17 April 2025

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TM711

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	Tang Tao
	Xiang Zhiqiang
	Zeng Xiangjun
	Chen Yulong
	Yang Cong

Cite this article:

Tang Tao,Xiang Zhiqiang,Zeng Xiangjun等. Analysis of Low-Frequency Transient Components of Line Break Fault without Earthing in Resonant Grounding Systems[J]. Transactions of China Electrotechnical Society, 2026, 41(7): 2315-2326.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.250640 OR https://dgjsxb.ces-transaction.com/EN/Y2026/V41/I7/2315

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