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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.

Classification:

Customized Transformer

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Number:

a001

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隐藏域元素占位

Field of application

Residence

Industry and commerce

Energy Storage

Photovoltaic power generation

Metal melting

State Grid

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
Overload Capacity	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
Cooling	Oil-directed OFAF (oil-immersed)	55℃ ambient operation certified

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
Recommended Power Range	≤3000 kW	Recommended ≥2000 kW
Grid Compatibility	Avoid weak grids (SCC >50x load required)	Tolerant to weak grid conditions