What are the advantages for 5 legs(limbs) core transformer?
Reduction of the height of the equipment
Reduction of stray losses: part of the magnetic flux dispersed from the coils will circulate through the return limbs without causing losses in the steel frames or tank
Low reluctance path for zero sequence flux (important in YNyn): in addition to avoiding heating in the tank, it also reduces the intense magnetic fields propagated by the transformer during inrush events, for example.
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