The purpose of this paper is to study the influence of environmental factors on the insulation performance of the separable connector for 12 kV gas filling cabinet and

at the same time

to provide a practical basis for the application of partial discharge discharge and chemical fusion detection in the field of insulation fault monitoring of 12 kV gas filling switchgear cabinet. The experimental model and experimental method are designed

the influence of environmental temperature and humidity on the insulation performance of the separable connector for 12 kV gas filling switchgear cabinet is studied firstly. Then

the development process of insulation fault due to high humidity

high contamination and high salinity is simulated quickly by using the method of rising the test voltage till insulation breakdown. The electrochemical sensors are used to monitor the aging products of insulation gas and study the variation of the cracking products of insulation materials after insulation breakdown. The experimental results show that high temperature

high humidity and high salinity conditions can reduce the insulation performance of the separable connector of 12 kV gas-filling switchgear cabinet

the cracking of insulation materials can produce such gases as nitric oxide

nitrogen dioxide and non-methane total hydrocarbons and

furthermore

in case of insulation fault

the worse the insulation performance of the separable connector is

the higher the concentration of the above three gases generated is

which can be used as an indicator gas for the insulation status assessment of the 12 kV gas filling switchgear cabinet.