Matlab/Simulink-based alternating current (AC) fault arc simulation method

A technology of fault arc and simulation method, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., and can solve problems such as inaccurate simulation, inconsistency, and inability to accurately describe the physical process of arc combustion.

Active Publication Date: 2013-11-20
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing Mayr model cannot accurately describe the physical process of the arc burning, so it is different from the actual arc experimental data; the Matthews model regards the voltage at both ends of the arc as a constant when the arc is burning, and when the arc is actually burning, the two arcs are different. The voltage at the end is not constant, it is a function of the current value passing through the line, so the Matthews model cannot accurately simulate the changes in the voltage and current at both ends of the arc when the AC arc is ignited

Method used

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  • Matlab/Simulink-based alternating current (AC) fault arc simulation method
  • Matlab/Simulink-based alternating current (AC) fault arc simulation method
  • Matlab/Simulink-based alternating current (AC) fault arc simulation method

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Embodiment

[0054] The simulation calculation and experimental verification comparison of the present invention all adopt the Chinese industrial AC power, that is, the AC frequency ω=50Hz. exist figure 1 In the AC single-phase resistive system shown, let the power supply voltage R=56.5Ω, the current and the voltage waveform at both ends of the AC fault arc in series in the resistive system can be calculated numerically as figure 2 shown.

[0055] exist figure 1 In the AC single-phase resistive-inductive system shown, let the power supply voltage z=56.5+j22Ω, the current and voltage waveforms at both ends of the series AC fault arc in the resistance-inductive system can be calculated numerically as follows: image 3shown.

[0056] Figure 4 It is a mathematical model of an AC fault arc established according to the present invention, and an AC fault arc simulation model built in Matlab / Simulink software. The voltmeter 5 and ammeter 6 in the model are used to collect the arc voltag...

Embodiment approach

[0058] established as figure 1 As shown in the series AC fault arc test resistive system, let the supply voltage Load R=56.5Ω, the arc generator includes a fixed electrode and a moving electrode according to the standard of UL1699, wherein the fixed electrode is a copper rod, the moving electrode is a graphite rod with a diameter of 6.4mm, and the arcing end of the carbon rod Sharpen, the distance between the two ends of the arc is 0.2mm during the experiment, and the voltage and current data of the arc are measured. Simultaneously use Matlab / Simulink software to simulate under the same conditions Figure 4 The arc module is shown, and the voltage and current waveforms of the series AC fault arc in the resistive system can be compared with the actual waveforms as follows: Figure 5 and Figure 6 shown.

[0059] Implementation mode of AC single-phase resistive-inductive system:

[0060] Assume figure 1 The power supply voltage in the resistive-inductive system of the ser...

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Abstract

The invention relates to a Matlab/Simulink-based alternating current (AC) fault arc simulation method. The method comprises the following steps of 1) based on a mathematical model of a direct current (DC) arc, assuming a mathematical model of dynamic volt-ampere characteristics of the arc according to the relation between the static characteristics and dynamic characteristics of the arc, thus building dynamic mathematical models of a low-voltage series AC fault arc in a resistance system and a resistance and inductance system; 2) determining the combustion process of the AC fault arc by analyzing the dynamic mathematical models of the AC fault arc; 3) building a simulation model of the AC fault arc via Matlab/Simulink software according to the combustion process and dynamic mathematical models of the AC fault arc; and 4) operating the simulation model of the AC fault arc in the resistance system and the resistance and inductance system, and outputting the simulation results of the simulation model. Compared with the prior art, the method has the advantages of high simulation accuracy, accurate analysis of the dynamic characteristics of the arc, strong universality and the like.

Description

technical field [0001] The invention relates to an AC fault arc simulation method, in particular to an AC fault arc simulation method based on Matlab / Simulink. Background technique [0002] With the continuous development of social economy, the number of fire accidents has also increased year-on-year with urban construction and social development. Due to long-term operation and external force, the insulation of the line inside the house or inside the household appliance will cause aging, shedding or even breakage of the line insulation. This will lead to the generation of series and parallel arcs. When the arc burns, it will generate local high temperature and easily ignite the surrounding combustibles and cause a fire. Therefore, perfecting the dynamic model of the low-voltage arc helps us better understand the combustion process of the arc, and also provides more ways for the detection of the low-voltage arc. [0003] The arc dynamic model has been the object of intensive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 刘鹏张峰张士文
Owner SHANGHAI JIAO TONG UNIV
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