In this paper

the collision integral between neutral-neutral and neutral-ion in plasma when CO

2

is used to generate arc in isolated grounding switch.Using the law of mass action model

considering 20 kinds of particles

the mole fraction of each component of the CO

2

arc plasma with a pressure of 0.7 MPa and a temperature of 300 K to30 000 K was calculated

and 9 kinds of interacting particles and 15 kinds of neutral-neutral and 12 kinds of neutralion interactions.Select appropriate polarizability data in the literature and calculate the number of effective electrons in the

ionized state that contribute to the polarizability.Calculate the elastic collision integrals of（l

s）=（1

1）、（1

2）、（1

3）、（2

2） in four cases using the phenomenological method

and use the fitting formula of Laricchiuta calculate the inelastic collision of atoms interacting with their first-order ions

and establish a CO+2 neutral-neutral and neutral-ion collision integration database.The research results are basically consistent with the known collision integral results.The method in this paper can provide theoretical support for the collision integration of SF

6

new environmentally friendly alternative medium

and provide basic data for the numerical simulation research of transport coefficient and arc theoretical model.