Recently, the State Grid Hunan Provincial Electric Power Company completed "based on the electrical contact theory SF6 high voltage circuit breaker interrupter status assessment" and through technical appraisal. Accreditation Committee agreed that: The project is innovative, strong practicality, can effectively guide the SF6 high voltage circuit breaker status assessment and state maintenance work, the results reached the leading domestic level. The technology pioneered the output DC current 1000A and "stroke - resistance curve" test function dynamic resistance test device, breaking the monopoly of foreign technology. Among them, the "stroke - resistance curve" test results applied to the evaluation of the status of the interrupter of the SF6 circuit breaker can effectively extend the interrupter maintenance and repair cycle. At present, the technology has been successfully applied to the routine test of Hunan 50 sets of 110 kV circuit breakers and 25 sets of 220 kV circuit breakers, and the result of the state-based maintenance work has been reduced by 1,100 days And maintenance costs 6.55 million yuan, accumulated a large number of experimental data and optimize the assessment model. This technology has changed the domestic SF6 circuit breaker arcing chamber detection limited to the main circuit resistance, mechanical properties and AC voltage withstand test can not accurately reflect the status of the arcing contact plays an important role in the status quo, SF6 circuit breaker life assessment Research and status assessment of the arc extinguishing chamber is of great guiding significance and can be promoted and applied in the company system.
