Affiliations: [a] School of the Electrical Engineering, Beihang University, Beijing, China | [b] School of the Electrical Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, China | [c] Smart Grid Research Institute, Beijing, China | [d] China Power Research Institute, Beijing, China
Correspondence:
[*]
Corresponding author: Yingyi Liu, School of the Electrical Engineering, Beihang University, Xueyuan Road 37, Haidian District, Beijing 100191, China. Tel.: +86 010 82316147; E-mail:[email protected]
Abstract: Aimed to provide a more close-to-reality and rapid
calculation method for optimization design of low voltage circuit breaker
with complex mechanism, an interruption model is constructed, which can
describe the coupling of air blast process with arc model, complex
mechanical movement, magnetic field, and electric circuit. The model is
based on the non-stationary gas conservation equations, and considers the
influence of the chamber structure on the gas dynamics. To realize the
interaction between the arc movement and the gas flow simply, on the one
hand, the moving electric arc is deemed an energy input source of the
chamber gas. On the other hand, the movement equation of the arc considering
action of the gas flow is built. With this model, the general principle of
the chamber gas flow, arc voltage and current during the interruption
process of an actual breaker are calculated and compared with the experiment
results. As an application, the influence of the chamber vent size on the
arc movement is studied with the model as well.
Keywords: Low voltage circuit breaker, arc, air blast, multi-field coupled interruption model
