Sun, J.; Shao, C.; Zhang, K.; Liu, J.; Yan, S.; Liu, Y.; Zhang, Y. Characterization of the Airflow Distribution near a Circuit Breaker’s Cu-Ag-Alloy Electrode Surface during and after Breakdown. Coatings2024, 14, 305.
Sun, J.; Shao, C.; Zhang, K.; Liu, J.; Yan, S.; Liu, Y.; Zhang, Y. Characterization of the Airflow Distribution near a Circuit Breaker’s Cu-Ag-Alloy Electrode Surface during and after Breakdown. Coatings 2024, 14, 305.
Sun, J.; Shao, C.; Zhang, K.; Liu, J.; Yan, S.; Liu, Y.; Zhang, Y. Characterization of the Airflow Distribution near a Circuit Breaker’s Cu-Ag-Alloy Electrode Surface during and after Breakdown. Coatings2024, 14, 305.
Sun, J.; Shao, C.; Zhang, K.; Liu, J.; Yan, S.; Liu, Y.; Zhang, Y. Characterization of the Airflow Distribution near a Circuit Breaker’s Cu-Ag-Alloy Electrode Surface during and after Breakdown. Coatings 2024, 14, 305.
Abstract
Abstract: Circuit breakers are affected by multiple lightning strikes after the breaker has been tripped and can break down again, which will reduce the life of the circuit breaker and threaten the stable operation of the power system. Aiming at this problem, the paper obtained the temperature diffusion process of the inrush current process of circuit breaker opening and breaking through the schlieren technique, and combined with the existing image recognition technology to obtain the temperature characteristics of the airflow in the air gap of the contact, and the characteristics of the airflow flow. The results of the study show that the circuit breaker breakdown process generates a shock wave with a velocity approximately equal to the speed of sound under the same conditions. The maximum velocity of the airflow boundary diffusion is about 1/4 of the speed of sound under the same condition, and it decays very fast, reducing to the airflow drift velocity within 10ms after breakdown. The maximum temperature of the thermals is concentrated between 6000 and 8000 K and the temperature change is approximately inversely proportional to the square of time. The research provides the basis for the design of circuit breaker contact structure, opening speed optimization method, interrupter chamber and insulation design optimization.
Keywords
Gas insulated schlieren method plasma contact structure breakdown airflow
Subject
Engineering, Electrical and Electronic Engineering
Copyright:
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