A three‑dimensional wound core is a wound‑type magnetic core. The entire core is formed by joining three identical single‐frame sections; once assembled, they form a stable equilateral‑triangle spatial structure. This gives the core high mechanical strength, ensures that the three phases experience equal forces (enhancing short‑circuit withstand capability), and places the three limbs at the corners of an equilateral triangle in space.
Existing amorphous‐alloy transformer cores typically use one of two flat-wound-core configurations: a four‑frame/five‐leg design or a three‑frame/three‑leg design. Both adopt an open‐type planar wound core, and their coils have rectangular cross sections—primarily because the amorphous‑alloy core limbs themselves have rectangular cross sections.
However, with both core limbs and coils rectangular in cross section, short‑circuit withstand capability is reduced. Reinforcements and press‑fitting processes are required to compensate, and the many joints inherent in the planar wound‑core design lead to increased noise.
Although these issues can be mitigated by adding more raw material and reinforcing the tank structure, the resulting rise in overall cost hinders the widespread adoption of amorphous‐alloy transformers.
By contrast, the three‑dimensional wound core transformer offers lower noise and stronger short‑circuit withstand capability under identical conditions. It also reduces overall size and weight, cutting both manufacturing and operating costs. Therefore, developing an amorphous‑alloy three‑dimensional wound‑core transformer—combining the advantages of both traditional designs—promises broad application prospects and significant socio‑economic benefits.
Features of Oil‑Immersed Amorphous‑Alloy 3D Wound‑Core Transformers
1. High Core Strength
The amorphous ribbon is wound tightly into a closed‑loop structure; the core is solidified into a single, rigid piece. This makes it highly robust and stable in operation, resistant to fragmentation or damage. During maintenance, the core can be reused.
2. Exceptional Short‑Circuit Withstand, Three‑Phase Balance, and Low Noise
The spatially symmetric limb arrangement ensures uniform magnetic forces, enhancing mechanical integrity and minimizing acoustic emissions.
3. Uniform Hot‑Spot Temperature Rise
The compact, symmetric winding structure promotes even heat distribution, avoiding localized overheating.
4. Material Savings
The optimized core geometry and tighter stacking reduce the amount of magnetic material required.
5. Low No‑Load Losses and Low No‑Load Current
The amorphous core exhibits very low hysteresis and eddy‑current losses when energized without load.
6. Minimal Stray Flux
The compact 3D core and symmetric coil arrangement greatly reduce stray magnetic fields by roughly half compared to traditional designs, lowering electromagnetic radiation.
Taken together, these advantages make the amorphous‑alloy three‐dimensional wound core transformer highly competitive versus conventional amorphous transformers. It truly earns the title of “Environmental Protector,” and in today’s push for green, low‑carbon solutions, its promotion is both timely and well‑justified.
Advantages of Dry‑Type Amorphous‑Alloy 3D Wound‑Core Transformers
1. High Insulation Class
Available in Class H (max. 180 °C) or Class R (max. 220 °C), supporting strong overload capability.
2. Environmentally Friendly and Renewable
The core and insulation materials are recyclable, with minimal environmental impact.
3. Low Partial Discharge
Intrinsic to amorphous alloys and epoxy resin encapsulation, partial discharge levels remain below 5 pC.
4. Excellent Weather Resistance
Outstanding moisture and dust protection, suitable for harsh environments.