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期刊论文
Dynamic stability of shallowarch with elastic supports-application in the dynamic stability analysis of inner winding of transformer during short circuit
nternational Journal of Non-Linear Mechanics 37(2002)909-920,-0001,():
In this paper, the dynamic stability of a shallowarch with elastic supports subjected to impulsive load is used as a theoretical model to investigate the dynamic stability problem of inner windings of power transformer under short-circuit condition. Firstly, the series solution representing the equilibrium conogurations of a shallowarch is obtained by solving the corresponding non-linear integration-di1erential equation. The local stability of each equilibrium conoguration is discussed, and the su-cient condition for stability of the shallowarch system as well as the critical load against snap-through is obtained. Secondly, the equivalent relation between short-circuit load and impulsive one, and the electrical forces transferred pattern between the coils of inner windings are assumed. Then the results of the shallowarch model are applied to the case of the inner winding of transformer and the formulas for computing critical electromagnetic force and the dynamic stability criterion of the inner windings are established. Finally, examples are o1ered and the theoretical results are shown to agree well with the experimental ones.
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