Description
B&W SQ-300I 8700700-004
Technical Specifications
- Brand: Babcock & Wilcox
- Model: SQ-300I
- Part number: 8700700-004
- Product type: Microcontroller / automatic voltage control module
- Application: Electrostatic precipitator and dust collection power control
- Control function: Hybrid AVC for transformer-rectifier sets
- Compatible equipment: Single-phase and three-phase T/R sets depending on configuration
- Communication: Interface to computer-based data acquisition and monitoring software
- Mounting: Panel or control cabinet mounting within ESP control systems
- Environmental design: Industrial-grade construction for power plant and process environments
- Documentation required: Nameplate data, SQ-300I manual, wiring diagram and B&W product bulletin
Functional Features
- Controls transformer-rectifier output for electrostatic precipitators.
- Supports hybrid automatic voltage regulation.
- Monitors power supply operating conditions.
- Provides alarm and fault indication.
- Interfaces with plant monitoring or data acquisition systems.
- Supports parameter configuration for ESP operating requirements.
- Designed for reliable operation in harsh industrial environments.
- Enables remote monitoring when integrated with上位 software.
Application Scenarios
- Coal-fired power plant electrostatic precipitators.
- Industrial boiler dust collection systems.
- Cement plant particulate control.
- Steel mill emission control equipment.
- Chemical and process plant dust collectors.
- Waste-to-energy flue gas treatment.
- ESP retrofit and upgrade projects.
- Industrial environmental control systems.
Performance Parameters
- Hybrid automatic voltage control for ESP T/R sets.
- Real-time power monitoring and alarm reporting.
- Configurable control parameters.
- Industrial environmental durability.
- Compatible with single-phase and three-phase T/R configurations depending on system design.
- Exact input voltage, output interface, communication protocol, enclosure rating, temperature range, current rating, control resolution and firmware version must be confirmed from the official B&W SQ-300I documentation and the 8700700-004 nameplate.
Material Composition
- Industrial printed circuit board.
- Microcontroller and signal processing circuits.
- Power sensing and measurement circuits.
- Communication interface circuits.
- Alarm and status indicator circuits.
- Terminal blocks or connector interfaces.
- Protective enclosure or mounting panel.
- Grounding and shielding structures.
Structural Features
- Compact industrial controller module.
- Front-panel indicators for status and alarms.
- Terminal or connector access for field signals.
- Identification label with model and part number.
- Designed for integration into ESP control panels.
- Robust construction for power plant environments.
- Modular design for maintenance and replacement.
Working Principle
The SQ-300I microcontroller monitors the operating condition of an electrostatic precipitator transformer-rectifier set. It adjusts the firing angle or control output to regulate the high-voltage DC output applied to the ESP fields. The controller continuously evaluates voltage, current and spark conditions, and modifies output to maintain stable collection performance. Alarm functions notify operators of abnormal conditions such as excessive sparking, overvoltage, undervoltage or equipment faults. Communication interfaces allow integration with plant monitoring systems.
Installation Requirements
- Verify compatibility with the installed T/R set and ESP system.
- Confirm the correct part number before replacement.
- De-energize high-voltage equipment before installation.
- Follow high-voltage safety and lockout/tagout procedures.
- Ensure proper grounding of the control cabinet.
- Use the correct wiring diagram for the 8700700-004 revision.
- Maintain adequate ventilation around the controller.
- Configure control parameters according to ESP operating requirements.
Precautions for Use
- Only qualified personnel should service ESP control equipment.
- Do not exceed the rated electrical and environmental limits.
- Verify high-voltage isolation before performing maintenance.
- Do not disable alarm or protection functions without authorization.
- Back up configuration parameters before module replacement.
- Keep the controller free from dust, moisture and conductive contamination.
- Investigate alarm conditions before restarting the ESP system.
- Refer to the official B&W SQ-300I manual for exact specifications, wiring and troubleshooting.
