This paper describes experimental and analytic studies on pressure rise and propagation phenomena due to high current arcs in a container with opened pipes. The shape of the experimental container was chosen taking into account underground common ducts. First, arcs were ignited in the container with varying diameter D and length L of the opened pipes and at arc currents of 4 kA to 12.5 kA and an arc duration of 0.1 s. Based on measured waveforms, the maximum pressure rise P max and the pressure oscillation frequency P osc were obtained. It was found that there is a tendency for P max to increase with decreasing D and increasing L , and that D has a much greater impact on P max . In addition, the tendencies of P osc with changing D and L can be approximately explained by Helmholtz resonance. Second, a CFD model for the container with opened pipe was developed based on the experimental results, and simulations were performed. The simulation results were found to correspond to the experimental pressure rise.
Pressure Rise and Propagation Phenomena Due to Fault Arc in Container with Opened Pipe
Electrical engineering in Japan ; 190 , 3
2015
Aufsatz (Zeitschrift)
Englisch
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