ST200 Single-phase 150 A SCR Power Controller in Glass Fiber Crucible Drawing

Industry: Glass & glass fiber  |  Reference sites: Shandong Fiberglass, Jiujiang Fiberglass, Hubei Huerjie, Tai’an Hengcheng, Guangjian Fiberglass, Sichuan Hongcheng Fiberglass  |  Equipment: crucible drawing heating control systems  |  Product: ST200 single-phase SCR power controller 150 A

Kulun Electric’s ST200 single-phase 150 A SCR power controller is applied in glass fiber crucible drawing, serving Shandong Fiberglass, Jiujiang Fiberglass, Hubei Huerjie, Tai’an Hengcheng, Guangjian Fiberglass and Sichuan Hongcheng Fiberglass. For the crucible drawing requirements of bushing control, electric melting control, current/voltage accuracy and continuous production stability, Kulun provides heating power control solutions built around the ST200.

1. Project Overview

2. Application Background

Crucible drawing is an important process in glass fiber production. Its main control objects are bushing control and electric melting control: bushing control usually adopts constant voltage and constant temperature modes, while electric melting control mostly uses constant current mode.

In glass fiber drawing, the accuracy of bushing current, voltage and temperature control directly affects yarn quality, drawing continuity and production stability. The heating control system therefore requires the ST200 single-phase SCR power controller to deliver stable output, fast response and reliable protection.

3. Requirements & Technical Challenges

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

• High bushing control accuracy: Bushing current, voltage and temperature stability directly affect drawing quality.
• Constant current for electric melting: Electric melting conditions need stable current control to reduce process fluctuation.
• Continuous production reliability: Glass fiber lines run for long periods; the controller must adapt to high-temperature continuous conditions.
• Multi-site adaptation: Furnace types, circuits and control modes differ between plants and require site-specific configuration.
• System linkage: The controller must work with temperature controllers, PLC or supervisory systems for automated drawing process control.

4. KULUN Solution

Kulun Electric configured the ST200 single-phase SCR power controller (150 A) for bushing control, electric melting control and temperature control systems, based on the control objects and load characteristics of crucible drawing sites.

Built around the ST200, the solution supports constant voltage, constant temperature or constant current modes selected per process, and works with automation systems to regulate current, voltage and temperature — meeting glass fiber drawing requirements for stability and reliability.

Key Features of the Solution

• ST200 150 A single-phase regulation. Suits single-phase electric heating circuits of crucible drawing, covering bushing and electric melting power regulation.
• Electric melting adaptation. Constant current control can be configured for electric melting conditions, improving heating process stability.
• Smooth, reliable output. Stable power output helps reduce temperature and electrical parameter fluctuation during drawing.
• Built for continuous production. Designed for long-cycle glass fiber production and continuous site operation.
• Easy system integration. Works with temperature controllers, PLC and supervisory systems for automated heating control.
• Multi-site experience. Applicable to crucible drawing, electric melting and bushing control across different glass fiber plants.

5. Reference Projects

Kulun ST200 single-phase SCR power controllers have been applied in glass fiber projects at Shandong Fiberglass, Jiujiang Fiberglass, Hubei Huerjie, Tai’an Hengcheng, Guangjian Fiberglass and Sichuan Hongcheng Fiberglass.

Glass fiber customer sites | Crucible drawing process

In these projects, Kulun configured the ST200 around crucible drawing requirements for bushing control, electric melting control and yarn quality stability, working with site temperature control systems for heating power regulation and continuous line operation.

6. Project Site

ST200 single-phase 150 A SCR power controller applied in glass fiber crucible drawing

Glass fiber crucible drawing heating control site

7. Results

After the ST200 single-phase 150 A controller was applied to crucible drawing, bushing control and electric melting control gained stable power output, meeting site requirements for yarn quality, temperature stability and continuous production.

• Meets crucible drawing bushing control and electric melting control requirements;
• ST200 150 A rating fits single-phase heating circuit power control;
• Supports constant voltage, constant temperature and constant current modes;
• Helps reduce current/voltage fluctuation and improve drawing stability;
• Adapts to continuous production at multiple glass fiber customer sites;
• Easy integration with temperature control and automation systems.

Note: Actual performance varies with crucible structure, bushing specification, electric melting load, temperature control system, site grid conditions and process requirements.

8. Applicable Scenarios

The Kulun ST200 single-phase SCR power controller can be selected by control object, load capacity and site control mode for a range of glass fiber and industrial electric heating applications.

• Glass fiber crucible drawing
• Bushing constant voltage / constant temperature control
• Electric melting constant current control
• Electric heating systems of glass fiber production lines
• Industrial heating equipment requiring stable current and voltage control

9. FAQ