This series of five‑limb core rectifier transformers are power transformers specially matched for six‑phase double‑reverse‑star full‑wave rectifier units. Adopting a five‑limb core structure, the transformer allows triple‑frequency high‑order harmonic magnetic fluxes of identical three‑phase phases to form closed loops in the side yokes. Similar to a balancing reactor, the three‑phase five‑limb core enables parallel operation of two sets of three‑phase half‑wave rectifiers. Meanwhile, zero‑sequence magnetic fluxes among asymmetric components can pass through the side yokes, which greatly reduces losses of structural parts inside the rectifier cabinet.