Product Overview
The EAF Transformer (Electric Arc Furnace Transformer) is a core electrical component used in arc furnace and submerged arc furnace operations. It converts high-voltage power from the grid into low-voltage, high-current output, providing the electrodes with the strong and stable electrical energy required to sustain continuous and stable arc melting inside the furnace.
In steelmaking, metal smelting, ferroalloy production, and other high-temperature electric heating processes, the transformer is a central element of the power supply system. Its design and performance have a direct impact on operational reliability, energy efficiency, and overall maintenance costs.
Technical Features
1. High Transformation Ratio
The EAF transformer is designed with a large transformation ratio, featuring high-voltage input on the primary side and low-voltage, high-current output on the secondary side. This configuration provides the electrical foundation for generating stable and powerful electric arcs.
2. Large Capacity and High Current Capability
Transformer capacity can be engineered according to furnace size and production requirements. Secondary current output can range from several thousand amperes to over one hundred kiloamperes, meeting the demands of high-intensity smelting operations.
3. High Impact Resistance and Mechanical Strength
Electric arc furnace operation involves significant current fluctuations, frequent short circuits, and overload conditions. The transformer is designed with high short-time overload and impact withstand capability, and can be operated in conjunction with series reactors to limit short-circuit current.
4. Multiple Cooling Options
Cooling methods can be selected based on rated capacity and site conditions, including Oil Natural Air Natural (ONAN), Oil Forced Air Forced (OFAF), and Oil Forced Water Forced (OFWF). These cooling systems effectively control temperature rise and enhance long-term operational reliability.
Product Advantages
1. Specifically designed for electric arc furnaces and steelmaking equipment, the transformer delivers stable power supply under high load and severe current impact conditions, ensuring consistent arc generation.
2. High mechanical and electrical strength design, combined with temperature monitoring and protection systems, reduces the risk of unplanned downtime caused by current surges or short-circuit faults.
3. Capacity rating, cooling configuration, voltage regulation scheme, and installation interfaces can all be customized to suit project requirements, making the transformer suitable for various EAF sizes and integrated smelting systems.
Application
- AC and DC Electric Arc Furnaces
- Auxiliary heating systems for submerged arc furnaces
- Secondary refining equipment power supply systems
- Core power distribution units for large steel and alloy production lines
FAQ
Q1: How is transformer capacity selected?
A: Capacity selection depends on furnace tonnage, expected current demand, and melting cycle requirements. It is typically determined through system engineering calculations and can be customized.
Q2: Does the transformer support on-load voltage regulation?
A: Yes. Common tap changers or on-load voltage regulation devices can be integrated to adjust voltage according to different process stages.
Q3: What protection systems should be integrated into the transformer?
A: Typical protections include overcurrent protection, temperature monitoring, pressure relief devices, and insulating oil monitoring to ensure long-term reliable operation.
Q4: How should oil-immersed and dry-type transformers be selected?
A: For high-capacity and high-current applications, oil-immersed transformers are commonly used due to superior cooling performance, while dry-type transformers are suitable for medium and low-capacity applications with higher environmental requirements.
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