Fault line selection method, device and equipment for arc suppression coil grounding system

Abstract

The invention provides an arc suppression coil grounding system fault line selection method, device and equipment. The fault line selection method comprises the following steps: calculating transient energy and zero sequence active power amplitude of each component according to bus zero-sequence voltage, arc suppression coil current and zero-sequence current of each feeder line; selecting a first alternative component according to the transient energy of each component and a first line selection condition; selecting a second alternative component according to the zero sequence active power amplitude of each component and a second line selection condition; judging whether the first alternative component is consistent with the second alternative component; if so, judging the first alternative component or the second alternative component is the fault component; or otherwise, comparing a first creditability coefficient of the first line selection condition and a second creditability coefficient of the second line selection condition, and selecting the alternative component corresponding to the line selection condition, the creditability coefficient of which is larger, as the fault component. Accurate and reliable fault line selection can be realized for various earth faults of intermittent grounding and the like in a phase-control arc suppression coil grounding system.

Description

technical field [0001] The invention relates to the field of computer technology, in particular to a fault line selection method, device and equipment for an arc suppression coil grounding system. Background technique [0002] The arc suppression coil grounding system is a main neutral point grounding form of my country's distribution network, and the phase-controlled arc suppression coil based on power electronic device control is widely used. The problem of fault line selection in case of single-phase ground fault has always been one of the key problems to be solved in the arc suppressing coil grounding system. In various single-phase ground faults, intermittent arc ground faults have the characteristics of unstable fault current amplitude, nonlinearity and randomness of the arc, which greatly increases the difficulty of fault line selection. [0003] At present, there are mainly two fault line selection methods for intermittent arc grounding in the arc-suppression coil g...

AI Technical Summary

Problems solved by technology

The transient line selection method utilizes the fault transient characteristics at the initial stage of grounding, and can perform line selection during the transient process, but it is difficult to correctly select the line when there is a delay in the startup of the line selection device or the transient characteristics are not obvious, especially in intermittent ground faults In the case of high-impedance grounding, the transient quantity generated by the first grounding is small, making the transient characteristics not obvious

[0004] In addition, due to the complexity of intermittent ground faults, a single line selection method often cannot achieve reliable line selection, and the line selection method with multi-criteria fusion will have higher line selection accuracy and reliability

However, the overly complex intelligent technology fusion algorithm has high requirements on the computing power of the line selection device, which is not conducive to the implementation in specific projects.

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