Numerical Simulation and Analysis of Plate Erosion by High-current Air Arc
The increasing capacity of transmission and distribution of power grids puts forward higher requirements for the low-voltage circuit breaker(LVCB)interruption performance.When an LVCB breaks a high current,the metal vapor produced by arc plate erosion greatly affects the interruption performance of the circuit breakers,impedes the develop-ment of the circuit breaker,and impairs the safe operation of the power grid.Therefore,a plate erosion model with a breaking current of 10 kA is established and the plate erosion characteristics are studied in this paper.The model considers the different energy injects of plate cathode and anode,the melting and evaporation of plate materials,and the changes of plate surface morphology,and introduces the arc root movement into this model.By using this model,the erosion mass and the distribution of temperature and melting materials are calculated.The results show that the temperature rise and temperature rise area of plate cathode are less than those of the plate anode.The position and size of the melting area change with the movement of the arc root.The plate anode temperature reaches the material melting point and boiling point at 2.19 ms and 2.89 ms,respectively.The erosion mass of plate anode is 1.84 mg.The plate cathode temperature reaches the material melting point at 4.12 ms and is always less than the material boiling point.The erosion mass of plate cathode approaches 0.The plate erosion morphology is obtained in this paper,and the results can contribute to the study of the effect of change in the length and migration path of short arc between plates caused by plate erosion on the inter-ruption performance of the circuit breakers.
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