Description
Technical Specifications of Silicon Steel Core Transformers
1. Silicon Steel Core Properties of Planar Transformer
- 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:
- GB 1094: Power Transformers (equivalent to IEC 60076-1)
- GB/T 6451: Technical Parameters and Requirements for Three-Phase Oil-immersed Power Transformers
- 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:
- S22 Class I Efficiency (NX1): Ultra-high efficiency (compatible with IEC 60076-20 Tier 3).
- S20 Class II Efficiency (NX2): Advanced efficiency (meeting DOE 2016 standards).
- S13 Class III Efficiency (NX3): Baseline efficiency (for cost-sensitive applications).
Structural Features of Planar Transformer
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).
