Abstract
The distribution and magnitude of leakage magnetic field of the winding in the short-circuit condition of the transformer determine the distribution and magnitude of the short-circuit electromagnetic force. It is related to the short- circuit strength and stability of the transformer winding and even jeopardizes the safety and reliability of the operation of the transformer and the power grid system. This paper takes a three-phase three-column dry-type transformer as the research object, establishes its three-dimensional finite element analysis model, and simulates the three-dimensional leakage magnetic field of three-phase winding under different short circuit conditions. The radial and axial magnetic flux distribution of different windings under different short-circuit conditions are compared and analyzed, which lay a foundation for exploring the location of damage response of transformer under different short-circuit conditions. Finally, experimental data verify the correctness of the simulated calculation and the accuracy of the distribution law.
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