Oil-immersed Silicon Steel Planar Transformer

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Technical Specifications of Silicon Steel Core Transformers

1. Silicon Steel Core Properties

• Material Composition: Silicon alloy steel containing 1.0–4.5% Si and <0.08% C, optimized for:
  • Low core losses (iron losses)
  • High magnetic flux density (≥1.7T under 50Hz, per IEC 60404-8-4)
  • High permeability, low coercivity, and enhanced resistivity
• Structural Advantages:
  • Compact size and lightweight design
  • Reduced material consumption (core, windings, insulation, and structural components)
  • Simplified assembly and transportation

2. 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)

3. 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

Technical Specifications of Power Transformers

1. Core Design

• High-grade grain-oriented silicon steel core:
  • Low losses (no-load loss ≤0.9W/kg, per IEC 60404-8-4).
  • Compact size, high mechanical strength, and superior short-circuit withstand capability (≥25kA/3s).

2. Winding Configuration

• Coil structure:
  • HV windings: Circular/oval shape with polyvinyl acetal enameled wire (thermal class 180°C).
  • LV windings: Flat wire or copper foil construction for enhanced short-circuit resistance (IEC 60076-5).

3. Connection & Performance

• Dyn11 connection group:
  • Mitigates higher harmonics (THD ≤3% per IEEE 519).
  • Robust load imbalance resistance (up to 10% phase imbalance).
  • Ensures stable voltage regulation (±1.5% under dynamic loads).

4. Insulation & Sealing

• Vacuum oil impregnation:
  • Eliminates air bubbles in windings (degassing rate ≥99.9%).
  • Stabilizes dielectric strength (≥50kV AC/1min, per IEC 60296).
• Hermetically sealed corrugated tank:
  • Dual-channel corrugated plates (wave depth >250mm) prevent plastic deformation and oil leakage.
  • IP55 protection (IEC 60529) blocks moisture ingress, extending insulation lifespan by ≥30%.

5. Oil Maintenance & Longevity

• Fully sealed oil system:
  • Zero contact with ambient air, eliminating oxidation and moisture absorption.
  • Delays insulation aging (service life ≥40 years under IEC 60076-14 loading guidelines).

Product Specification