Flux distribution and core loss calculation for single phase andfive limb three phase transformer core designs

摘要

This paper presents results of an analytical core loss calculationnmethod developed for single phase and five limb three phase core types.nShown are calculation results of flux distributions, flux densitynwaveshapes, spatial flux density curves and loss distributions in coresnother than the 3 phase-3 limb core. The analytical results show that thenflux distribution is essentially uniform in the single-phase 2 limb andn3 limb cores. The flux waveforms are also shown to be essentiallynsinusoidal in different regions of the core. However, for thensingle-phase 4 limb core and the three-phase 5 limb core, the fluxndistribution is nonuniform and flux waves are very distorted. Thencalculated values of core losses were, generally, in excellent agreementnwith tested core losses of actual commercial transformers. The resultsnon the very large 4 and 5 limb cores show that the production complexitynof these cores cause a slightly higher tested core loss which needs tonbe included in the development of the core loss calculation for thesencores