A Modeling Method of Arc Voltage Gradient Based on MHD Simulation

A magnetohydrodynamics, arc voltage technology, applied in design optimization/simulation, CAD numerical modeling, electrical digital data processing, etc., can solve the problems of high test cost, uncontrollable test, and inability to carry out arc test widely.

Active Publication Date: 2022-03-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Due to problems such as serious time-consuming, high test cost, and uncontrollability of the test due to the characteristics of the arc itself and environmental factors in the on-site operation of the arc test, the arc test has the disadvantages that it cannot be widely carried out and cannot be repeatedly verified.

Method used

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  • A Modeling Method of Arc Voltage Gradient Based on MHD Simulation
  • A Modeling Method of Arc Voltage Gradient Based on MHD Simulation
  • A Modeling Method of Arc Voltage Gradient Based on MHD Simulation

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Embodiment

[0052] In order to comprehensively analyze the voltage characteristics of medium and low voltage short-gap arc faults, the mathematical method of tracking the dynamic characteristics of arc voltage is discussed;

[0053] Based on the Mayr black-box model of switching arcs, the following assumptions are made for short arcs:

[0054] 1) The temperature of the arc channel is constant, and the increase of the arc column energy leads to the increase of the arc cross section;

[0055] 2) The arc column area has a constant electric field strength, and the voltage changes with the continuous change of the arc length.

[0056] Under these assumptions, the arc can be described by a first-order differential equation, where the arc conductance is expressed as a function of the heat content of the arc column:

[0057]

[0058] where g is the time-varying arc conductance, u arc is the instantaneous arc voltage, i arc is the instantaneous arc current, P loss is the arc power loss duri...

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Abstract

The invention discloses an arc voltage gradient modeling method based on magnetohydrodynamics simulation. According to the description of classical arc physical characteristics and the definition of fluid, it is based on Maxwell's equation, air equation, energy equation and fluid mechanics equation. The combined mathematical expression of the arc fault is reproduced on the simulation platform based on the MHD analysis method taking into account the multi-scenario physical characteristics of the arc fault evolution description, and the MHD dynamic model is constructed by means of numerical analysis, which avoids the complexity of on-site measurement and has a good simulation Combined ability, it can accurately predict the voltage gradient of medium and low voltage short arc, and provide a reference for medium and low voltage arc fault protection.

Description

technical field [0001] The invention belongs to the technical field of arc flash, and more particularly relates to an arc voltage gradient modeling method based on magnetohydrodynamic simulation. Background technique [0002] Applying a large enough voltage between two conductive objects can cause a breakdown of the insulation, resulting in an arc. Along with the rapid release of energy, the intense heat, light, and sound generated by arc flashes can cause substantial damage to people and objects around them, and can also cause fires. [0003] In order to prevent arc accidents and mitigate the hazards caused by arc flashes, the current research focus begins with the measurement and calculation of the incident energy that may be generated by arc flashes. In 2000, Doughty et al. explored factors directly related to the incident energy level of an arc flash. In 2002, IEEE-1584 released "Arc Flash Hazard Calculation Guidelines", which systematically discusses the calculation m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F30/28G06F30/367G06F111/10G06F119/14
CPCG06F2119/06G06F2111/10G06F30/367G06F30/23
Inventor 张真源聂义民黄琦井实
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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