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6 pulse high overload medium frequency furnace transformer
The type of industrial frequency rectifier transformer is specially designed for small and medium power medium frequency furnaces (500-3000kW). Through 6-pulse rectification + enhanced overload structure, it provides a reliable power conversion solution in budget-sensitive scenarios and meets harsh working conditions such as frequent start and stop, cold furnace shock, etc.
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6 pulse high overload medium frequency furnace transformer
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DESCRIPTION
Product Introduction
Designed for medium/low-power induction melting systems, this industrial-frequency rectifier transformer delivers 150% continuous overload for 1 hour and 200% short-duration overload, effectively handling cold furnace startup surges. Available in dry-type or oil-immersed configurations, it adapts to 3.3-33kV grid environments for foundry power conversion applications.
Technical Specification
| Parameter | Dry-Type | Oil-Immersed |
| Power Rating | 500-2500kVA | 800-3000kVA |
| Primary Voltage | 3.3-11kV (50/60 Hz) | 6.6-33kV (50/60 Hz) |
| Secondary Voltage | 380- 750 V AC | 400- 900 V AC |
| Overload Capacity | 150%/1hr continuous | 160%/1hr continuous |
| 200%/30s short-duration | 210%/30s short-duration | |
| Insulation Class | H (180℃) | A (105℃) |
| Protection Rating(IP) | IP54 | IP55 |
| Sound Level | ≤70 dB (A) | ≤65 dB (A) |
Working Principle
1. Core Rectification Topology
6-pulse rectification: Single three-phase secondary winding directly feeds IGBT/SCR bridge, generating DC voltage with 300Hz ripple frequency.
Harmonic profile: Dominant 5th (250Hz) and 7th (350Hz) grid harmonics (THDi≈25-35%).
2. Enhanced Overload Design
| Component | Reinforcement Solution | Performance Benefit |
| Windings | Oxygen-free copper foil + axial cooling ducts | 20% higher surge current tolerance |
| Core | 0.23mm laser-scribed silicon steel | Noticeably reduced no-load loss |
| Cooling | Dual-fan forced air (dry-type) | 55℃ ambient operation certified |
| Oil-directed OFAF (oil-immersed) |
Comparison between 6 pulse and 12 pulse
| Parameter | 6-Pulse | 12-Pulse |
| Harmonic Suppression | Requires 5th/7th filters (+15-20% cost) | Native 85% harmonic reduction |
| System Cost | 35-40% lower (transformer + PSU) | Higher initial investment |
| Optimal Power Range | ≤3000 kW | Recommended ≥2000 kW |
| Grid Compatibility | Avoid weak grids (SCC >50x load required) | Tolerant to weak grid conditions |
Application
Power small/mid-sized foundries
1-3 ton iron/aluminum melting furnaces (24/7 operations)
Streamline die-casting cells
Zinc/magnesium alloy melt-hold systems
Modernize retrofit projects
Energy-saving upgrades for electroslag furnaces
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Factory Address:500 meters southeast of Yilong Bridge in Yichuan, Luoyang, China