WLKF Generator Excitation Series
PRODUCT ADVANTAGEADVANTAGE
HENGDA's excitation products deliver multifaceted value and experiences that go beyond more than just technical specifications.
● Reduced Operating Costs and Maintenance
Minimized Downtime: Dual-system redundancy, hot-swappable components, and under-6ms auto-switchover significantly reduce unplanned downtime, avoiding production losses and related penalties.
Simplified Maintenance: Integrated self-diagnosis and accurate fault localization streamline troubleshooting, cut maintenance workload, and reduce dependency on highly skilled staff.
Extended Equipment Lifespan: Advanced contactless de-excitation technology protects motor stator windings from damaging overvoltage surges, extending motor/generator service life and lowering repair costs.
● Enhanced Safety in Hazardous Environments: The WLK-WS3 Series delivers a critical safety solution for highly flammable, explosive, or dusty industrial environments with its IEC-certified explosion-proof rotating control module, ensuring the protection of both personnel and valuable assets in such settings.
● Future-Oriented Investment and Adaptability
Modular and Scalable Design: A structured hardware and software architecture supports easy expansion, smooth upgrades—including Industry 4.0 compatibility—and high adaptability to evolving operational needs, protecting the long-term value of your investment.
Global Interoperability: Core components are compatible with leading global brands, enabling seamless integration with existing equipment and legacy systems. This simplifies procurement, reduces integration complexity, and offers greater design flexibility.
● Optimized Performance and Energy Efficiency
Precise Control for Energy Optimization: Maintains high accuracy in power factor and reactive power regulation, ensuring optimal energy use and helping avoid grid penalties due to poor power quality.
Smooth Start & Operation: Soft-start and polarity-matched slip excitation reduce mechanical stress on motors and generators, minimizing wear and extending service life.
● Intuitive Operation and Full Data Visibility: The advanced HMI, featuring a 10-inch color touchscreen (dual screens on S3/WS3), delivers real-time data, historical trends, and detailed alarm information. This clear and comprehensive system overview enables proactive management, quick response to abnormalities, and informed decision-making.
Product Introduction in the Series
WLKF-T33 Excitation System for Low-Voltage Units
The WLKF-T33 is designed to provide static thyristor excitation regulation and control for synchronous generators with a unit capacity of up to 1000 kW. It adopts an integrated design that combines the regulation panel, excitation power panel, and de-excitation panel into a single cabinet.
This compact and unified structure simplifies installation, commissioning, and maintenance—making it ideal for small-scale power projects where space or budget may be constrained. It offers a streamlined, cost-effective solution tailored to the needs of compact generating sets.
WLKF-T3 Generator Excitation System
The WLKF-T3 is a single-channel, silicon controlled rectifier (SCR) excitation control cabinet for synchronous generators, consisting of two main units: a power unit and an excitation controller. It is primarily used for automatic excitation power regulation in hydro-generator sets, and is also suitable for steam turbine and diesel generators of equivalent capacity. This excitation system supports both standalone and grid-connected operation of generators.
WLKF-S3 Generator Excitation System
The WLKF-S3 is a dual-channel, microprocessor-based excitation control cabinet for synchronous generators. It features a fully redundant design with dual-system configuration for controllers, main circuits, and touchscreens, enabling both hot-standby and independent operation modes. Suitable for hydro-generator sets as well as steam turbine and diesel generators of equivalent capacity, this system provides automatic excitation power regulation. It supports both standalone and grid-connected operational requirements.
WLKF-WS Brushless Synchronous Generator Excitation Control System
The WLKF-WS is a dual-channel, silicon controlled rectifier (SCR) excitation system designed for brushless synchronous generators. It incorporates a fully redundant architecture with dual controllers, main circuits, and touchscreens, supporting both hot-standby and independent operation. Suitable for hydroelectric generator sets as well as steam turbine and diesel generators of equivalent capacity, this system delivers automatic excitation power regulation. It meets operational requirements for both standalone and grid-connected generator applications.
Core Technical Features Shared Across WLK and WLKF Series
● Digital Signal Processing (DSP): All models employ a 32-bit DSP for digital sampling and control, ensuring high sampling accuracy, rapid processing speed,and precise control tracking.
● Adaptive Control: The controller intelligently selects the optimal control strategy based on real-time motor/generator operation and sample data,optimizing performance and reducing commissioning time.
● Human-Machine Interface (HMI): Features a 10-inch TFT true-color LCD touchscreen (dual screens for S3/WS3 models) for comprehensive monitoring, parameter configuration, and fault information display,supporting both Chinese and English menus.
● Communication Capability: Includes RS485 and Modbus interfaces for seamless interacting with DCS,supporting remote monitoring and control.
● Flexible Control Modes: Supports multiple operating modes such as constant power factor, constant excitation current, constant excitation voltage, or constant firing angle operation, enabling automatic tracking of operating conditions and disturbance-free switching.
● Forced Excitation Function (Optional): Enhances system stability by activating forced excitation during grid voltage dips.
● Comprehensive Protection & Limiting Functions: Provides limits for max/min excitation current/angle,various out-of-step protection functions(e.g.,excitation loss, de-excitation, excitation failure,tec.), PT/CT disconnection protection, and self-diagnostics (e.g., pulse abnormalities, software/hardware errors, overtemperature, and thyristor faults),all with alarm logging and display.
WLKF CASE
● Case: Excitation System for a Synchronous Motor in an Air Compressor, Sichuan Jinbei Chemical's Synthetic Ammonia Production Line
● Challenge: In 1996, the customer needed a customized excitation system for an air compressor in a new synthetic ammonia production line. At that time, very few excitation products offered microprocessor-based intelligent control, and standard solutions could not meet their precise and varied operational requirements.
● Solution: Hengda Industrial Control provided a brush-type microprocessor-controlled excitation system, which was already commercially available in 1996. The system was precisely tailored to meet the customer's specific needs.
● Result: Through close collaboration, Hengda Industrial Control successfully delivered a customized excitation control system. This solution has ensured the safe and continuous operation of the synchronous motor for 29 years and remains in service without a single failure. As a result, Sichuan Jinbei Chemical has since become a key long-term partner of Hengda Industrial Control.
USE cases
Case Study: High-Voltage Liquid-Resistance Soft Starter System Upgrade
1. Project Background
The high-voltage motor system at Shaanxi Yangxian Yuhu Chemical Co., Ltd. had been operating with liquid-resistance soft starters for more than a decade. As the existing equipment aged, several pain points became evident:
The liquid-resistance cabinets were bulky and occupied excessive floor space.
Their complex design demanded frequent maintenance of electrolytes, electrodes, and mechanical parts, resulting in significant O&M workload and high costs.
Startup performance was limited—low accuracy and the inability to support frequent restarts within short intervals—constraining production scheduling flexibility. The customer urgently required a high-efficiency, low-maintenance, and intelligent high-voltage soft-start solution.
2. Hengda's Solution：
Having reliably used Hengda’s excitation systems for more than a decade, the customer had full confidence in our product quality and service support. Based on this established trust, the customer directly selected the HDGR solid-state soft starter cabinet for this critical upgrade.
The solution delivered transformative results:
Lower O&M Costs & Space Optimization: The fully solid-state, modular design occupies significantly less space than the former liquid-resistance cabinet. Eliminating the need for electrolytes and mechanical upkeep, the maintenance frequency and costs were drastically reduced, achieving truly “low-maintenance or maintenance-free” operation.
Improved Startup Performance & Productivity: Leveraging high-precision thyristor control technology (as HDGR is solid-state), the system ensures smooth starting, completely eliminating mechanical and electrical shock during startup. It also supports rapid, repetitive starts and stops, significantly increasing the operational efficiency of the production process. The system's integration enables remote monitoring and condition diagnostics, further aligning with the customer's requirements for a digitalized and intelligent factory upgrade.
3. Client Feedback
The Operations and Maintenance (O&M) Department spoke highly of the benefits of the HDGR's minimal maintenance needs and high starting accuracy. They reported that the new equipment's performance stability and reliability significantly exceeded expectations, effectively guaranteeing the full life-cycle operation of critical assets. This retrofit not only addressed the client's core O&M pain points but also—via advanced solid-state technology—achieved a dual enhancement in production efficiency and reliability in a critical industrial segment.
Hubei Sanning Group: Eliminating Recurrent Failures in Synthesis Reactor Electric Heating with WDTJ
● Customer Challenge
The original temperature control system for Hubei Sanning Group's synthesis reactor relied on analog, non-microprocessor-based circuitry (using resistors and capacitors) to adjust the thyristor firing angle. This caused significant three-phase output imbalance. The resulting uneven heating of three-phase resistor elements led to frequent filament cracking, breakage, and short circuits, repeatedly forcing production line stoppages.
● Our Solution
Since 1997, we have supplied the first-generation WDTJ AC voltage and power regulation cabinet to address this issue. By implementing high-performance industrial control chips and digital synchronous phase-shifting technology, we entirely replaced the unstable analog control, achieving precise digital regulation of the firing angle.
● Long-Term Results
After the upgrade, the system immediately delivered accurate three-phase voltage triggering and stable output current. This completely eliminated unplanned downtime caused by three-phase imbalance at Hubei Sanning Group, ensuring continuous production.
● Built on this long-term trust and proven operational performance,Hubei Sanning Group has since adopted nearly 20 sets of our latest WDTJ AC voltage and power regulation cabinet across five newly built chemical plants. All WDTJ cabinets have been maintaining precise control and stable operation, consistently supporting the development of Hubei Sanning Group's chemical industry.
Case Study:Electrostatic Precipitator Upgrade at Hubei Sanning Chemical
● Customer Challenges
Hubei Sanning Chemical’s electrostatic precipitator (ESP) system had been operating for years with increasing failures and declining dust collection efficiency. Key issues included:
-Failure to reach target high-voltage levels
-Poor voltage control accuracy
-Inability to effectively limit discharge spark frequency
These shortcomings not only risked non-compliance with environmental standards but also undermined production stability.
● Our Solution
We delivered a customized WGT-series high-voltage control power supply featuring:
-Highly precise voltage regulation and improved step-up characteristics
-Microprocessor-controlled monitoring and limitation of spark rate (sparks per minute)
● Results Achieved
-Operating voltage increased by 10%, significantly improving dust removal efficiency
-Stable and accurate voltage output with tightly controlled sparking
-Markedly improved system reliability and reduced failure rate
-The system has now operated flawlessly for three years, earning consistent positive feedback from the custome
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