Transformers & Substations

Three-Dimensional Wound-Core Transformer (Low-Loss)

Triangular wound core · oil or dry

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Entogo three-dimensional triangular wound-core low-loss distribution transformer

Overview

A three-dimensional (triangular) wound-core distribution transformer with a closed, symmetric core for lower no-load loss, balanced flux, low noise and high short-circuit withstand — oil-filled or dry-type, 15/25/35 kV class, 60 Hz. Designed to IEEE C57/UL and DOE 10 CFR 431; UL/CSA certifiable.

This three-dimensional (triangular) wound-core transformer winds a continuous ribbon into a closed, symmetric core, giving all three phases an equal magnetic path. The result is lower no-load loss, balanced excitation, low audible noise and a 15.7 % larger coil pressed area than a flat / stacked-core design for stronger short-circuit withstand — positioned as an efficiency upgrade to a conventional distribution transformer.

It is available oil-filled as a pad-mounted unit (designed to IEEE C57.12.34) or as a dry-type unit (UL 1561 / 1562), in 15 / 25 / 35 kV class to 480 / 208 V at 60 Hz, with an amorphous core option for the lowest standby loss. The core-and-coil meets DOE 10 CFR 431 efficiency; UL (cULus) / CSA certification is available on request.

Key features

  • Three-dimensional triangular wound core gives a symmetric, continuous magnetic path — lower no-load loss and balanced three-phase excitation.
  • Positioned as an efficiency upgrade to a conventional stacked-core unit; clears DOE 10 CFR 431 and suits loss-evaluated bids.
  • Continuous wound ribbon minimizes vibration and audible noise.
  • 15.7 % larger coil pressed area than flat-type cores raises short-circuit withstand.
  • Available oil-filled (pad-mounted, IEEE C57.12.34) or dry-type (UL 1561 / 1562), 60 Hz — UL (cULus) / CSA certification available on request.

FAQ

Common questions

What is the advantage of a three-dimensional wound core?
The triangular wound core gives all three phases an equal, closed magnetic path, which lowers no-load loss, balances excitation current and reduces audible noise versus a conventional stacked (flat) core — useful where no-load losses are evaluated in the bid.
Is it available oil-filled or dry-type?
Both. It is offered as an oil-filled pad-mounted unit (designed to IEEE C57.12.34) or as a dry-type unit (UL 1561 / 1562), 60 Hz, in 15 / 25 / 35 kV class — with an amorphous core option for the lowest standby loss.

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