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Method and system for detecting current data of alternating current fault series arc

A series arc and detection method technology, applied in the direction of test circuit, test dielectric strength, instrument, etc., can solve problems such as crosstalk interference research, incomplete load type, loss, etc., to achieve the improvement of characteristic value amplitude and safe and stable operation effect of ability

Pending Publication Date: 2022-07-29
XIAN UNIV OF TECH
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Problems solved by technology

For the detection module that has been implemented in hardware, because the load types involved in the research are not comprehensive, effective and sufficient research on crosstalk interference has not been carried out, which leads to the disconnection of the circuit due to misjudgment under different shielding load conditions, resulting in unnecessary loss

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  • Method and system for detecting current data of alternating current fault series arc
  • Method and system for detecting current data of alternating current fault series arc
  • Method and system for detecting current data of alternating current fault series arc

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Embodiment Construction

[0045] The present invention will be further described in detail below in conjunction with the accompanying drawings, which are to explain rather than limit the present invention.

[0046] see Figure 15 , a method for detecting the current data of an AC fault series arc, comprising the following steps:

[0047] Step 1. Obtain the current data of the AC fault series arc through arc physical modeling and experimental diagnosis multi-source generation method;

[0048] Specifically, the Cassie arc model is used to establish a series arc fault simulation system. The series arc fault simulation system is as follows: figure 1 As shown, the load types considered by the arc fault simulation system include resistive loads, inductive loads, motor-like loads, and power electronic loads. figure 2It is an arc simulation model subsystem. The arc simulation model determines that the current parameter is 0-63A and the line impedance parameter is 0-100m through the change of the source load...

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Abstract

The invention discloses a method and system for detecting current data of an alternating current fault series arc, and the method comprises the steps: carrying out the time-frequency domain analysis of a current data sequence, and evaluating the characteristic performances of the current data sequence under the conditions of the disturbance of a combined electric appliance without a resistive shielding load, the single disturbance of the combined electric appliance with the resistive shielding load and the disturbance of the combined electric appliance through employing a relative lifting ratio index; and selecting and determining key parameters such as an arc characteristic form, a decomposition scale, a characteristic frequency band and the like, and comprehensively extracting fault information in the current data by using the optimal characteristic to serve as a basis for discriminating a fault arc. According to the method, the characteristic quantity amplitude can be obviously improved after the fault arc occurs, so that the fault arc under complex and diversified shielding load interference can be quickly and accurately identified, and the safe and stable operation capability of the whole low-voltage alternating-current circuit system is improved.

Description

technical field [0001] The invention relates to the technical field of low-voltage alternating current fault arc detection, in particular to a method and system for detecting current data of alternating current fault series arcs. Background technique [0002] The problem of arc fault detection has been widely concerned by scholars in the field and has become a research hotspot. In order to improve the accuracy of fault arc detection, scholars at home and abroad have studied many methods to distinguish the normal operation status of the line and whether it is faulty, and then judge the occurrence of the arc. In order to realize the diagnosis of the fault arc, three types of methods are generally used, mainly based on the mathematical model of the arc, the physical phenomenon and the electrical characteristics. [0003] The first method is to identify the arc fault by combining the mathematical model of the arc fault. Due to the complex mechanism of arc fault and the imperfe...

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Application Information

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IPC IPC(8): G01R31/14G06K9/00
CPCG01R31/14G06F2218/02G06F2218/08G06F2218/12
Inventor 汪倩陈思磊王嘉楠于长龙
Owner XIAN UNIV OF TECH
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