The insulation rod

as the key element for connecting the contact and operating mechansim of UHV GIS circuit breaker

needs withstanding external stress during the operation. For mastering the dynamic stress characteristics and the material’s mechanical charcateristic of the insulating rod

the force sensor is arranged in the UHV GIS circuit breaker to measure the dynamic stress of its main insulation rod during the operation period. According to the measurement results

the compression test of tubular sample of the insulation rod is carried out

and the compression buckling characteristics of samples with different length diameter ratio are simulated and analyzed. The test results show that the insulation rod is subjected to alternating impact loads during operation. The peak of the pressure applied by the operating mechanism to the insulation rod is close to that of the tensile force in the test

and both of them are above 110 kN. Therefore

the compression characteristics of the material of insulation rod should be paid attention to. The compression test results show that the length

inner and outer diameters will directly affect the compression performance of the tubular insulation rod

plastic deformation and buckling instability under compressive force are more likely to occur for the insulation rod with large aspect ratio

and the bore maximum compressive load is smaller. Based on the compression test of the material

the approximate relationship between the critical buckling load and length of the insulating rod is set up through simulation calculation

and a method to obtain the critical buckling load of the original-sized rod is proposed through the compression test of the tubular specimen. The research results of this paper can provide reference for the material testing

design and manufacture of insulation rod for UHV GIS.