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Negative polarity corona discharge continuous current pulse simulation method

A corona discharge and current pulse technology, applied in the field of negative corona discharge continuous current pulse simulation, can solve the problem of only obtaining a single discharge pulse, and achieve the effect of saving cost, time, and easy calculation.

Pending Publication Date: 2022-03-11
XIAN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a negative polarity corona discharge continuous current pulse simulation method, which solves the problem that only a single discharge pulse can be obtained in the prior art

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  • Negative polarity corona discharge continuous current pulse simulation method

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Embodiment Construction

[0037] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0038] The present invention provides a negative corona discharge continuous current pulse simulation method, which is specifically implemented according to the following steps:

[0039] Step 1, using the needle-plate electrode to simulate the metal tip defect, according to the structure of the needle-plate electrode, establish a two-dimensional axisymmetric model in COMSOL software, and use triangular elements to mesh the two-dimensional axisymmetric model, the mesh Mass greater than 0.95;

[0040] Since the entire discharge area is three-dimensional and radially homogeneous, a quasi-three-dimensional image of the discharge can be obtained by selecting a two-dimensional axisymmetric plane. Therefore, a two-dimensional axisymmetric model is established to determine the calculation area, and the calculation area includes the needle The bounda...

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Abstract

The invention discloses a negative polarity corona discharge continuous current pulse simulation method which specifically comprises the following steps: step 1, according to a needle-plate electrode structure, establishing a two-dimensional axial symmetry model in COMSOL software to determine a calculation area, and performing mesh generation on the two-dimensional axial symmetry model by adopting a triangular unit; 2, solving two Boltzmann equations by adopting Bolsig + software to obtain a reduced ionization coefficient, a reduced adsorption coefficient, an electron mobility and an electron diffusivity of the discharge gas; 3, establishing a continuous current pulse forming mechanism of negative corona discharge, setting an electron boundary condition as secondary electron flux at the tip of the needle electrode, and calculating spatial and temporal distribution of electrons, positive ions and negative ions; and step 4, calculating the discharge current. According to the invention, the problem that only a single discharge pulse can be obtained in the prior art is solved.

Description

technical field [0001] The invention belongs to the technical field of insulation monitoring and fault diagnosis of electric equipment, and relates to a method for simulating continuous current pulses of negative corona discharge. Background technique [0002] SF 6 Due to its excellent insulation and arc extinguishing properties, gas has been widely used as an insulating medium in power equipment. However, SF 6 The greenhouse effect of the gas is very serious, and its global warming potential is CO 2 23900 times. Currently, in SF 6 Research on alternative gases has focused on SF 6 with N 2 and CF 4 mixed gas, CF 3 I and its mixed gas, c_C 4 f 8 and its mixed gas, C 4 f 7 N and its mixed gas, C 5 f 10 O and its mixed gas, C 6 f 12 O and its mixed gases, etc. [0003] However, during the manufacturing, installation and operation of power equipment, burrs, metal particles, etc. will inevitably be left, which will cause distortion of the electric field inside th...

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Application Information

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IPC IPC(8): G06F30/23G06F17/12G01R31/12
CPCG06F30/23G06F17/12G01R31/1254
Inventor 高青青赵妮张在秦张嘉伟
Owner XIAN UNIV OF TECH
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