APR3 Three-phase 350 A SCR Power Controller in the Wuhan Yingyan Silicon Steel Annealing Line

Industry: Steel & silicon steel heat treatment  |  Site: Wuhan Yingyan silicon steel annealing line  |  Product: APR3 three-phase SCR power controller 350 A

Kulun Electric’s APR3 three-phase 350 A SCR power controller is applied in the Wuhan Yingyan silicon steel annealing line, mainly for power regulation and temperature control of the annealing line heating sections. For silicon steel annealing requirements of heating stability, temperature uniformity, continuous operation reliability and multi-loop control, the solution uses APR3 series three-phase SCR power controllers for smooth, precise power regulation of electric heating loads.

1. Project Overview

2. Application Background

The silicon steel annealing line is important continuous heat treatment equipment in the steel industry; heating section temperature control directly affects material microstructure, surface quality and downstream processing stability. Annealing usually requires multi-section heating, multi-loop control and long continuous operation, placing high demands on controller output stability and control response.

At the Wuhan Yingyan silicon steel annealing line, the heating system must regulate three-phase electric heating loads smoothly, reduce temperature fluctuation and adapt to continuous line production rhythm. The APR3 three-phase SCR power controller regulates output from the temperature control system setpoint, providing a stable execution unit for annealing line heating control.

3. Requirements & Technical Challenges

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

• Smooth heating power regulation: Annealing line heating needs continuous, smooth power output, reducing temperature fluctuation effects on process stability.
• Coordinated multi-loop control: Silicon steel annealing lines contain multiple heating zones, requiring multi-point control and zoned temperature regulation.
• Three-phase electric heating loads: Site heating loads are high power, requiring stable three-phase output control capability.
• Continuous operation reliability: Steel lines run long hours; the controllers must adapt to high-load continuous production.
• Site anti-interference: Industrial electrical environments are complex; the control system must maintain stable communication, reliable triggering and protection response.

4. KULUN Solution

Kulun Electric configured APR3 three-phase SCR power controllers (350 A) for the heating sections of this silicon steel annealing line, for power regulation of the electric heating system.

APR3 series controllers receive control signals from the temperature control system and continuously regulate three-phase electric heating loads, helping the annealing line achieve stable ramp-up, soaking and zoned temperature control — suitable for industrial heating scenarios of steel heat treatment lines.

Key Features of the Solution

• Three-phase power regulation. Suits three-phase electric heating loads, regulating output from control signals for annealing line heating control.
• 350 A rating fit. Targets higher-power heating circuits, meeting the current capacity requirements of annealing line electric heating systems.
• Smooth, controllable output. Continuous heating power regulation helps reduce temperature fluctuation and improve annealing process stability.
• Built for continuous lines. Adapts to long-running steel heat treatment lines and continuous industrial heating control.
• Easy temperature control integration. Works with temperature controllers, PLC or supervisory systems for zoned temperature control and automated regulation.
• Industrial reliability. Designed for industrial electric heating environments, adapting to site electrical interference, cooling and protection requirements.

5. Reference Projects

APR3 three-phase 350 A SCR power controllers have been applied in the heating system of the Wuhan Yingyan silicon steel annealing line, for site electric heating power control.

Wuhan Yingyan | Silicon steel annealing line

In this project, Kulun APR3 three-phase controllers are configured around annealing line requirements for heating stability, temperature control and continuous operation. Multiple APR3 units work with the site temperature control system for zoned regulation of heating circuits, meeting annealing line production heating control needs.

6. Project Site

APR3 three-phase 350 A SCR power controller applied in the Wuhan Yingyan silicon steel annealing line heating system

Heating application site of the Wuhan Yingyan silicon steel annealing line

7. Results

After the APR3 three-phase 350 A controllers were applied to the silicon steel annealing line, the heating system gained smooth, controllable power output, meeting site requirements for zoned heating, temperature stability and continuous production.

• Meets three-phase electric heating power control requirements of the annealing line;
• Supports stable power regulation of 350 A heating circuits;
• Helps reduce heating power fluctuation and improve temperature control stability;
• Adapts to multi-loop, multi-zone heating control scenarios;
• Meets continuous operation requirements of steel heat treatment lines.

Note: Actual performance varies with furnace structure, load type, temperature control system, process profile, site grid conditions and cooling environment.

8. Applicable Scenarios

APR3 series three-phase SCR power controllers can be selected by current rating, control mode and site load requirements for a range of industrial electric heating and heat treatment control applications.

• Silicon steel annealing line heating systems
• Continuous heat treatment lines in the steel industry
• Temperature control systems of three-phase resistance furnaces and electric heating furnaces
• Multi-zone, multi-loop heating control projects
• Industrial heating equipment requiring stable power regulation

9. FAQ

Related Products & Technical Articles

This case uses the APR3 three-phase SCR power controller. For selection, see the article on load-based power controller sizing and selection.