Abstract
Resonant grounding system has been widely applied in low-voltage power systems all over the world. For the single-phase ground fault feeder-selection of resonant grounding system, the amplitude/phase comparison method of zero-sequence current which is used in traditional fault feeder-selection is not suitable to be used, due to the compensation action of arc suppression coil. In this paper, the electrical quantity changes after the single-phase ground fault of small current grounded system are analyzed firstly, therefore the reason why the amplitude/phase comparison method of zero-sequence current is not suitable to be used in resonant grounding system can be obtained. After that, based on zero-sequence current’s multi-state components (transient component and steady component), a new fault feeder-selection method using double criteria is proposed, which not only can be applied in the single-phase ground fault of resonant grounding system but also has high reliability. At last, simulations based on MATLAB/Simulink are conducted to verify the validity of the method proposed in this paper.
Highlights
The neutral non-direct grounded system, which is called as small current grounded system, is widely used in 3~60kV distribution networks
The remaining of this paper is structured as follows: In Section 2, the electrical quantity changes after the single-phase ground fault of small current grounded system are analyzed, and the reason why the amplitude/phase comparison method of zero-sequence current is not suitable to be used in resonant grounding system is summarized
The electrical quantity changes after the single-phase ground fault of small current grounded system are analyzed and the reason why the amplitude/phase comparison method of zero-sequence
Summary
The neutral non-direct grounded system, which is called as small current grounded system, is widely used in 3~60kV distribution networks. The academic circles have already done some researches on it, most of the current methods are based on single criterion [7,8], and the reliability needs to be improved Given this situation, based on zero-sequence current’s multi-state components (transient component and steady component), a double criteria feeder-selection method, which can be applied in the single-phase ground fault of resonant grounding system and has high reliability is proposed in this paper. The remaining of this paper is structured as follows: In Section 2, the electrical quantity changes after the single-phase ground fault of small current grounded system are analyzed, and the reason why the amplitude/phase comparison method of zero-sequence current is not suitable to be used in resonant grounding system is summarized.
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