Simulation on the Coupled Fluid-Mechanical Dynamic Analysis of High-voltage Self-blast Circuit Breakers

The previous design process for a High Voltage Circuit Breaker (hereafter HVCB) includes the steps of `basic design', `production', `testing', and `commercialization' for when a product achieved the targeted performance. If the targeted performance could not be obtained through testing, an improved design was derived through the results of Computer-aided engineering (hereafter CAE) analysis, and this testing process was repeated until the targeted performance was achieved. This process was consumed a significant amount of time and resources. However by utilizing Coupled Fluid-mechanical dynamics analysis, by being able to verify the basic functionality of the circuit breakers (hereafter CB) through pre-analysis before having to manufacture and test prototypes, it was not only possible to minimize the number of design revisions and test cycles required for the testing and manufacturing of the circuit breakers, but it was also possible to optimize the form of the circuit breaker based on the results obtained from CAE analysis in the initial design stages. For this purpose, this research paper proposes a method based on Coupled Fluid-mechanical dynamics analysis. This paper additionally introduces calculations with respect to the reaction forces of the Oil-dash pot (hereafter ODP), which have an obvious influence on the latter half section of actual travel curves.