Oil-Immersed Silicon Steel Three-Dimensional Distribution Transformer

 Compliance with National Standards

This product series complies with the following Chinese national standards:

1. GB 1094: Power Transformers (equivalent to IEC 60076-1)
2. GB/T 6451: Technical Parameters and Requirements for Three-Phase Oil-immersed Power Transformers
3. GB 20052: Energy Efficiency Limits and Grades for Power Transformers (aligned with IEC 60076-20)

 Energy Efficiency Classification

The series is categorized into three efficiency levels:

1. S22 Class I Efficiency (NX1): Ultra-high efficiency (compatible with IEC 60076-20 Tier 3).
2. S20 Class II Efficiency (NX2): Advanced efficiency (meeting DOE 2016 standards).
3. S13 Class III Efficiency (NX3): Baseline efficiency (for cost-sensitive applications).

Structural Features

Triangular 3D Wound Core Transformer Technical Advantages

1. Noise Reduction

• Tightly Wound Structure:
  The core is formed by sequentially winding trapezoidal silicon steel strips with ultra-precise alignment, minimizing gaps between layers.
  • Vibration Suppression: Reduces operational noise to ≤55dB(A) @1m (per IEC 60076-10).

2. Optimized Magnetic Circuit

• Seamless Layering:
  Eliminates air gaps and joint-induced flux distortion, ensuring uniform magnetic flux distribution.
  • Low Magnetic Resistance: No localized high-resistance zones (flux density deviation <1%).
• Crystal Orientation Alignment:
  Flux direction aligns perfectly with the grain orientation of silicon steel (B30P105 CRGO), reducing hysteresis losses by 20% vs. conventional cores.

3. Symmetrical Three-Phase Design

• Balanced Magnetic Paths:
  • Equal length of three-phase magnetic paths with minimized total length (e.g., 15% shorter than E-I cores).
  • Perfectly balanced no-load currents (imbalance <0.5%).
• Triangular Core Assembly:
  • Constructed from three identical single-frame cores, each with semi-circular cross-section columns and yokes.
  • Post-assembly, the three columns form an equilateral triangle, enhancing structural stability.

4. Structural & Performance Benefits

Engineering Notes:

• Core Fabrication: Laser-cut trapezoidal strips (0.23mm thickness) wound under 20-ton tension for precision.
• Triangular Stability: Mechanical FEA confirms 200% higher seismic resistance (IEEE 693 compliant).

Applications: Urban substations, offshore wind farms, high-rise buildings.