STACK-TYPE, PLANAR, THREE-PHASE OPEN TRANSFORMER CORE

摘要

Disclosed is a stack-type, planar, three-phase open transformer core. The core comprises two inner ring single-frame cores formed by sequentially stacking an inner layer strip group (3), a middle layer strip group (4) and an outer layer strip group (5), and one outer ring single-frame core. Openings of single-ring strip frames constituting the inner layer strip group are symmetrically disposed at an upper end of a single-frame core limb (11), openings of single-ring strip frames constituting the middle layer strip group are symmetrically disposed at the upper end of the single-frame core limb and on an inclined surface forming a bend between the single-frame core limb and a single-frame core upper yoke (12), and openings of single-ring strip frames constituting the outer layer strip group are symmetrically disposed at the upper end of the single-frame core limb, on the inclined surface forming the bend between the single-frame core limb and the single-frame core upper yoke and at both ends of the single-frame core upper yoke. A distance between the opening on each single-ring strip frame and the nearest bending angle from the opening is greater than or equal to 5 mm. The core of the present invention has high mechanical strength, strong resistance to sudden short circuits, and high plug-in mounting efficiency.