Air switch gear plays an important role in the distribution network. Therefore

in view of the partial discharge monitoring of switch gear

we put forward a method of monitoring by testing the air decomposition components. In the self-built air partial discharge test platform

air was decomposed to form characteristic gas by PD in needle-plate model

the voltage on the needle-plate was adjusted to control the degree of PD

and the smoke analysis instrument and the discharge pulse current method were adopted to explore the correlation characteristics between partial discharge quantity and air decomposition components. Analyses of experimental data show that air can be decomposed in PD discharge needle-plate defects

generating

characteristic CO and NO

2

gas

the gas volume concentration increases as the discharge time increasing

and the early stage of the discharge gas volume concentration such as discharge presents the linear growth trend.The reaction matter decreases in discharge and presents a saturation phenomenon

and the degree of saturation of NO

2

is below that of CO. Because the gas concentration of CO and NO

2

gas rate trends to saturate

the dischage presents a linear relationship of saturation.