DCP3 SCR DC Power Supply for the 8500 kVA Submerged Arc Furnace at Ya'an Jianyin

Industry: Submerged arc furnace, smelting  |  Reference site: Ya’an Jianyin, Sichuan  |  Configuration: DCP3 SCR thyristor DC power supply, 8500 kVA

Kulun Electric’s DCP3 SCR thyristor DC power supply is applied in the submerged arc furnace DC power project at Ya’an Jianyin, Sichuan, with a project capacity of 8500 kVA, successfully commissioned in July 2025. The solution adopts an equivalent 24-pulse, co-phase reverse parallel, double inverse star structure for high-power DC supply of submerged arc furnaces, featuring stable output, low overall temperature rise, high power factor and reliable site operation.

1. Project Overview

2. Application Background

Submerged arc furnace smelting sites are high-power, high-current, strong-impact load scenarios with high requirements on DC power system output stability, temperature rise control, grid adaptability and long-term reliability. The power system must continuously deliver stable DC output under complex smelting conditions, supporting furnace condition control and continuous production.

The Ya’an Jianyin submerged arc furnace DC power project reaches 8500 kVA, and the site must balance high-power output, low temperature rise operation, high power factor and maintenance convenience. Kulun configured the DCP3 SCR thyristor DC power supply solution for these requirements.

3. Requirements & Technical Challenges

For this application, the heating and power control system had to address the following points:

• High-power DC output: The 8500 kVA project requires the power system to continuously deliver stable, reliable high-power DC output.
• Current balance and structural reliability: The co-phase reverse parallel, double inverse star structure improves current distribution and high-current operating reliability.
• Harmonics and grid impact control: The equivalent 24-pulse scheme improves input-side current quality and reduces impact on the site grid.
• System temperature rise control: The site requires overall temperature rise below 5 °C, imposing high demands on device selection, busbar design, cooling structure and cabinet layout.
• High power factor requirement: Project power factor reaches up to 0.95, so no additional reactive compensation is needed, reducing system package complexity.

4. KULUN Solution

Kulun Electric configured the DCP3 SCR thyristor DC power supply (8500 kVA) for the Ya’an Jianyin submerged arc furnace project, providing high-power DC supply.

The solution adopts equivalent 24-pulse rectification with a co-phase reverse parallel, double inverse star structure, improving high-current output stability and system efficiency. Overall temperature rise is below 5 °C and power factor reaches up to 0.95 without reactive compensation, suiting continuous smelting conditions of submerged arc furnaces.

Key Features of the Solution

• Equivalent 24-pulse rectification. Improves input-side current quality and reduces harmonics, suiting high-power submerged arc furnace DC power systems.
• Co-phase reverse parallel structure. Improves high-current output capability and parallel operation reliability for strong smelting loads.
• Double inverse star structure. Improves rectifier system stability and current distribution, suiting continuous furnace operation.
• Overall temperature rise below 5 °C. Optimized devices, busbars, cooling and cabinet structure reduce temperature rise and improve reliability.
• Power factor up to 0.95. No reactive compensation required, reducing site package investment.
• 8500 kVA engineering application. Applied in the Ya’an Jianyin submerged arc furnace DC power project and commissioned in July 2025.

5. Reference Projects

The DCP3 SCR thyristor DC power supply is applied in the Ya’an Jianyin submerged arc furnace DC power project (8500 kVA), successfully commissioned in July 2025.

Ya’an Jianyin, Sichuan | 8500 kVA submerged arc furnace DC power project

In this project, Kulun adopted the equivalent 24-pulse, co-phase reverse parallel, double inverse star structure around the furnace’s high-power DC supply needs, providing the site with a high power factor, low temperature rise, stable and reliable DC power system.

6. Project Site

DCP3 SCR thyristor DC power supply applied in the 8500 kVA submerged arc furnace project at Ya’an Jianyin

7. Results

The 8500 kVA submerged arc furnace DC power project at Ya’an Jianyin was successfully commissioned in July 2025. In site operation, the DCP3 SCR thyristor DC power supply delivers stable DC output for furnace smelting while balancing low temperature rise, high power factor and system reliability.

• Meets the 8500 kVA submerged arc furnace DC supply requirements at Ya’an Jianyin;
• Equivalent 24-pulse scheme helps improve grid-side operating quality;
• Co-phase reverse parallel and double inverse star structures improve high-current output reliability;
• Overall temperature rise below 5 °C suits continuous smelting conditions;
• Power factor up to 0.95 without reactive compensation.

Note: Actual performance varies with furnace capacity, furnace structure, smelting process, input grid, cooling conditions and site operating mode.

8. Applicable Scenarios

The DCP3 SCR thyristor DC power supply can be selected by capacity, voltage, current, furnace structure and grid conditions for a range of submerged arc furnace and high-power DC smelting supply applications.

• Submerged arc furnace DC power systems
• High-power smelting DC supply projects
• Industrial power scenarios requiring equivalent 24-pulse rectification
• Smelting lines with low temperature rise and high power factor requirements
• Projects requiring SCR DC power supplies packaged with complete control systems

9. FAQ