Research On The Aging Law Of BVR Wire Insulation Under High Temperature Salt Spray Environment

In view of the fact that the ambient temperature of southern coastal cities such as Shenzhen is higher than that of the inland,and is in the background of salt spray environment,this topic takes the copper core PVC insulated flexible wire（BVR）commonly used in life as the research object.In order to investigate the service life of BVR wires under different ambient temperatures and salt fog environment,this paper conducts accelerated thermal aging test on BVR wires and sets up two groups: "salt fog treatment" and "non-salt fog treatment".By recording the insulation resistance of BVR wires at different temperatures and aging times,and conducting statistical analysis,and finally using the Arrhenius formula to deduce its service life at normal ambient temperature and service life in the salt spray environment,it provides some reference significance for the maintenance and repair of BVR wires at different ambient temperatures and salt fog environment.Based on the above research objectives,the main contents of this paper are:Firstly,the insulation aging mechanism of BVR wires is deeply studied.After understanding and comparing a series of indicators that characterize the insulation aging state of BVR wires,the insulation resistance is finally selected as the evaluation index to characterize the insulation aging state.Secondly,a lot of preliminary preparations were made for the accelerated thermal aging test of BVR wires,including sample preparation,determination of aging temperature and salt spray concentration;in order to ensure the accuracy of the test results,the more widely used and mature constant stress accelerated life test was selected after comparison.Finally,a statistical analysis of the obtained test data is carried out to illustrate the significant difference in the resistance value of the insulation resistance of BVR wires after different temperatures and salt atomization treatment.Based on the Arrhenius formula and combined with the change trend of the measured test data,calculate the service life of BVR wires under different ambient temperatures and salt spray environments,so as to replace the aging and degraded wire in time to avoid electrical accidents.