Composite Arc Suppression Methods for Single-Phase Ground faults Based on fault Conductance Magnitude

doi:10.3969/j.issn.1008-0198.2026.02.004

Abstract

Abstract: Reliable arc suppression of ground faults is a critical guarantee for the safe and reliable operation of distribution networks. Generally, in the analysis of ground faults, it is assumed that the distribution network is three-phase balanced. Existing methods perform poorly in suppressing arcs when considering line impedance and asymmetrical loads in three-phase unbalanced distribution networks during single-phase ground faults. To address this issue, this paper proposes a hybrid method that combines current arc suppression and voltage arc suppression techniques. A distribution network model that accounts for asymmetrical line parameters and load imbalances is established and analyzed. By injecting current twice, the threshold value of ground conductance and the reference values for improving both arc suppression methods are calculated. When the ground conductance is less than the threshold, the voltage arc suppression method is used, and when the ground resistance is greater than or equal to the threshold, the current arc suppression method is employed. The proposed method can mitigate the impact of asymmetrical line parameters, ground impedance magnitude, and load imbalance, reducing the fault current to below the limit. finally, MATLAB/Simulink simulations verify the reliability and feasibility of the proposed arc suppression control strategy.

Key words: unbalanced power network, single-phase ground fault, voltage arc suppression method, injected current

CLC Number:

TM727

WANG Wen, WANG Da, CHEN Muye, LiU Weimin. Composite Arc Suppression Methods for Single-Phase Ground faults Based on fault Conductance Magnitude[J]. Hunan Electric Power, 2026, 46(2): 23-30.

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