Compact triangular core transformer

A three-phase stacked triangular transformer core (10) is provided. The transformer has three legs (21, 22, 23) and six yoke parts (31, 32, 33) therebetween, wherein said legs include stacked laminations. In a cross-sectional plane perpendicular to a central transformer core axis (H), the stacked laminations are oriented in substantially radial direction, and each leg (21, 22, 23) has two leg halves (21a, 21b, 22a, 22b, 23a, 23b), wherein each leg half has a plurality of outer corners facing a corresponding leg half of a neighboring leg. For each of the leg halves said plurality of outer corners lie on a respective straight line (P1, P2) within a lateral tolerance , and for each leg half the straight line defined by this leg half and the straight line defined by the corresponding leg half of the neighboring leg are parallel.