| The electrical connector is a basic element in the model equipment system,and its performance directly affects the service life of the entire equipment system.In the failure statistics of electrical connectors,insulation failure is one of its main failure modes.At present,the research on the performance of electrical connectors is mainly focused on the contact performance of the contacts.There are few studies on the performance of its insulating parts,and it is difficult to comprehensively evaluate the overall performance of electrical connectors.This article takes a certain type of electrical connector with glass fiber reinforced phenolic resin(FX-502)insulation as the research object.The storage environment effect and failure mechanism of insulators are analyzed.The accelerated test plan for insulating parts according to the main environmental factors is formulated.Combined with the test data,it reveals the effect of the temperature and humidity on the insulation performance of insulating parts.Combined with the test data,it reveals the evolution law of the insulation properties under the action of temperature and humidity.The above provides theoretical support for subsequent insulator mechanism modeling and insulation life evaluation of insulators.In chapter 1,the research background and significance of this article are explained.The current research status of five aspects of electrical connector insulation performance,insulation performance of glass fiber reinforced resin matrix composites,accelerated test,test design and accelerated test statistical analysis are summarized.And the deficiencies in the above five aspects of research are summarized.On this basis,the research objectives and main research contents of this article are put forward.In chapter 2,the environmental effects of the insulating parts in the storage environment are analyzed,according to the structure and material of the insulating parts for electrical connectors and the environmental stress on the profile during the storage period of the electrical connectors.The manifestations of insulation failure are given as insulation resistance reduction,insulation leakage and insulation breakdown.And it is determined that the key stresses affecting the performance of insulators under storage conditions are temperature and humidity.Through the failure analysis of the FX-502 insulation under temperature and humidity,the internal reasons for the aging of the insulation caused by temperature and humidity are revealed.In chapter 3,the performance characterization parameter of FX-502 insulating parts is given as insulation resistance,considering the measurability and destructiveness of commonly used electrical performance indicators of insulating parts By comparing the advantages and disadvantages of the existing common design methods,it is clearly that the regression orthogonal design method is used as a combination of temperature and humidity stress levels in the accelerated test.Based on the principle of the shortest distance between the needle and the pinhole on the insulation mounting board of a certain type of electrical connector and the shortest distance between the needle and the shell,the arrangement position of each pin on the insulation board is clarified,and the preparation plan of the test piece is determined.Through the design of stress level combination,sample size,test interval and other parameters,the temperature and humidity combined stress test plan for the FX-502 insulator is formulated,and 5 sets of stress combined tests were implemented.In chapter 4,using temperature and humidity combined stress test to collect insulation resistance data,and using A-D test to test the normality of the test data.Based on the analysis of the data by multiple linear regression,additional 4 sets of stress combination tests are added.Based on the quadratic regression orthogonal combination design theory for statistical analysis,a regression model of insulation resistance changes with temperature and humidity under the test time of 72 h,144h,216 h,and 288 h is established,and the parameters of the regression model are estimated and analyzed.The results show that the influence of humidity on the performance of insulating parts is greater than that of temperature,and the influence of temperature and humidity on the insulating performance of insulating parts has interactive effects and nonlinear effects.Finally,by using polynomial fitting,the performance degradation model of FX-502 insulation under the combined effect of temperature and humidity is deduced and given,and the performance evolution law of insulation under the effect of temperature and humidity is revealed.In chapter 5,the main research content and results of this article is summarized,and the next step of the research on the electrical connector FX-502 insulator is forecasted. |
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