Targeting at the characteristics of the dynamic resistance method can be used to detect the state ofcontacts without dismantling SF

6

circuit breakers

this paper proposes a complete set of SF

6

circuit breaker dynamicresistance measurement

analysis and diagnosis system on the basis of the existing dynamic resistance test method

data processing method and electrical life diagnosis model

which provides reference and basis for the on-sitemaintenance staff to have condition maintenance based on dynamic resistance method. The system consists

ofdynamic resistance test hardware

system of SF

6

circuit breaker dynamic resistance analysis

SF

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circuit breakerelectrical endurance diagnosis system

and it rules the test is controlled online with dynamic resistance tester

whichstandardized the process of dynamic resistance testing. The dynamic resistance curve should be obtained real-time toview and analysis. Electrical life diagnosis system is optimized to calculate the diagnosis parameters（resistance-travel integral and correlation coefficient）and gives an evaluation of the contact state further. The example showsthat the system is easy to operate and the process requires much less time

that the user can easily control the testprocess and obtain the dynamic resistance curve in real time. In addition

the electrical life diagnosis results andmaintenance advice are accurate by using diagnosis parameters resistance-itinerary integral and correlationcoefficient. The system is suitable for providing the accurate state information for circuit breaker conditionmaintenance

avoiding the unnecessary dismantling and waste.