International Journal of Applied Engineering Research

  • Year: 2010
  • Volume: 5
  • Issue: 7

Simulation of Electric Field Intensity and Computations of Point Plane Corona Inception in Air at Atmospheric Pressure

  • Author:
  • B.R. Natarajan1, G.R. Gurumurthy2, J. Amarnath3
  • Total Page Count: 10
  • DOI:
  • Page Number: 1137 to 1146

1Nitte Meenakshi Institute of Technology, Yelahanka, Bangalore, 560064, Karnataka state, India.

2B.N.M Institute of Technology, Banasankari IInd Stage, Bangalore, 560070, Karnataka State, India.

3JNTU college of Engineering, Hyderabad.

α

Townsend's first ionization coefficient

ή

Attachment coefficient

γ

Secondary ionization coefficient.

g

Gap distance

d

Diameter of hemispherical tip.

D

Diameter of Plane electrode

L

Length of the rod electrode

dc

Critical distance

n

Electron multiplication

n0

Initiatory electrons

v

Potential function

€

Relative permittivity

W

Energy

Abstract

A new method of determination of positive Corona inception voltages between point plane gaps in air is presented in this paper. The proposed method uses FEM based ANSYS software version 9.0(Multi Physics) for computation of electric field required in the above calculation. The method can be applied to point plane gaps where electric field variation does not vary considerably (less than 0.1%) over several electron mean free paths in air at atmospheric pressure. These calculations were made and compared with experimental data for tip diameters of 1.0 mm, 2.0 mm, and 3.0 mm and for gap distances varying from 20mm to 50mm (approximately). The numerically calculated values agreed to within 10% when compared with the experimental values reported in literature for positive polarity of the tip.

Keywords

Computation, Electric field intensity, positive polarity, corona inception, point plane gap