Comparison on losses and flux distribution among the three of 3 phase distribution transformer 1000kVA assembled from various amount of layer of transformer core lamination

Abstract

This paper describes the results of an investigation on the effect of different amount of layer of core lamination in three of 3 phase distribution transformers 1000kVA. The investigation involves the varian of power loss, building factor, total harmonic distortion of flux and flux leakages. The power loss and flux distribution have been measured using no laod test in three types of model of setting of core built from the same size and type of M5 (CGO) laminations. The loss of the transformer core with 20 layers of lamination is 6.3% and 9.3% better than the core assembled within 40 layers of lamination and the core assembled with 60 layers of lamination respectively at 1.7T, 50 Hz. The flux leakage at the corner joint in the core assembled with 20 layers of lamination is the lowest among the three of the transformers cores, over the whole flux density range. The flux leakage at the T-joint in the core assembled with 20 layers of lamination is the lowest among the three of the transformer cores, over the whole flux density range. Total harmonic distortion flux is the largest in the transformer core assembled with 60 layers of lamination and the smallest in the transformer core assembled with 20 layers of lamination. Using 20 layers of lamination in transformer core is more efficient than using the other two forms of thickness of lamination of transformer core.