Monte - Carlo simulation of particle movement in an un-energized transformer

The paper deals with the random movement of metallic particle in a high voltage transformer. A particle is assumed to be in the annular gap between HV winding and the press board cylinder nearest to HV winding, which is initially resting at the bottom portion of winding. Circulating oil induces movement in the gap and the particle starts moving in random direction depending on its shape and size. In order to generate a path of particle, Monte - Carlo simulation is performed by defining its velocity and random angle at every step of movement. The final results show the probability of striking the winding for a given velocity and angle. The transformer is assumed to be un-energized for computation. The probability of strike shows a definite trend with random angle assumed and velocity of movement generally encountered in Air Natural Forced Oil Cooling (ANFC) System. The results obtained may be helpful in determining the occurrence of partial discharge for an energized transformer.