Effect of transformer short-circuit the force

We have studied physics knowledge, in a magnetic field in a current-carrying conductor will have to bear the mechanical force, so when the transformer windings through the current time, but because of the role of current and the leakage magnetic field in the winding will generate an electromagnetic mechanical force its size depends on the magnetic field flux leakage current density of the wire multiplied, and we all know, have direction from left to decide. When the single phase pole mounted transformers is running under normal load, then the role of the force in the wire is relatively small, but in the event of sudden short-circuit, because the maximum short circuit current for the rated current 25-30 or will be greater, however, It is calculated according to the electromagnetic force generated between the windings and short circuit current and proportional to the square, so the mechanical force short circuit during normal operation will be substantially greater than the force of more than a few hundred times, and the speed of the force generated when a short circuit is very fast, in such a short period of time is too late to cut off the short-circuit circuit.
In short, the huge short-circuit electromagnetic force, may make the transformer windings will be damaged so there are many parts manufacturers in the design of the 500kva power transformer, you must study and other short-circuit power transformer in tolerance and winding in the case of a short circuit mechanical strength for verification, in order to ensure the normal operation and use of the transformer, we must take into account the stress problem transformer.