Description
Product Overview
The ABB XVC768116 3BHB007211R116 is a highly advanced, fully digital Excitation Controller or Automatic Voltage Regulator (AVR), a core component within ABB’s UNITROL® 6000 series of static excitation systems. This specific model, identified by the order code
3BHB007211R116, represents a powerful, modular, and configurable control unit designed for the precise regulation and protection of large synchronous generators and synchronous motors. Its primary function is to maintain the generator’s terminal voltage at a set value, control reactive power (VArs), and enhance power system stability by dynamically adjusting the DC current supplied to the generator’s rotor field winding via a thyristor converter. The controller achieves this by continuously acquiring and processing generator electrical parameters (voltage, current, power, frequency) and executing sophisticated digital control algorithms, including automatic voltage regulation (AVR), field current regulation (FCR), and an integrated Power System Stabilizer (PSS) to dampen electromechanical oscillations.The value of the ABB XVC768116 lies in its superior dynamic performance, high reliability, and advanced system integration capabilities. Engineered for demanding utility and industrial applications, it provides fast response to load changes and grid disturbances, ensuring optimal generator performance and grid code compliance. The controller incorporates comprehensive protection functions for both the generator and the excitation system itself. With native support for modern communication standards like IEC 61850, it seamlessly integrates into digital substations and plant-wide monitoring systems. For operators of power plants, large industrial drives, and synchronous condensers, the ABB XVC768116 is a critical asset that not only guarantees stable and efficient power generation but also provides the intelligence and connectivity needed for modern asset management, predictive maintenance, and participation in grid support services.
Technical Specifications
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Parameter Name
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Parameter Value
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Product Model
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ABB XVC768116 3BHB007211R116
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Manufacturer
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ABB
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Product Series
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UNITROL® 6000 Series
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Product Type
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Digital Excitation Controller / Automatic Voltage Regulator (AVR)
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Control Functions
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Automatic Voltage Regulation (AVR), Field Current Regulation (FCR), Reactive Power (VAr) / Power Factor (PF) Control, V/Hz Limiter, Under-Excitation Limiter (UEL).
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Power System Stabilizer (PSS)
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Integrated, advanced PSS (dual-input or multi-band) for effective damping of local and inter-area power oscillations.
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Protection Functions
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Over-Excitation Limiter (OEL), Volts per Hertz (V/Hz) Protection, Field Overcurrent, Stator Current Overload, Loss of Excitation (40G), Over/Undervoltage.
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Measurement Inputs
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Generator terminal voltage (via VTs), stator current (via CTs), field voltage and current, frequency, synchronizing signals.
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Control Outputs
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Firing pulses to thyristor bridges (via fiber optic links for isolation), analog outputs, relay outputs for alarms, tripping, and control.
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Communication Interfaces
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Multiple ports: Ethernet (IEC 61850-8-1 MMS, Modbus TCP/IP), Serial (RS-485/232 for Modbus RTU, IEC 60870-5-103), USB for local service.
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Human-Machine Interface
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High-resolution graphical display with keypad or touch screen for local configuration, monitoring, and manual control.
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Redundancy
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Supports configuration in redundant (hot or cold standby) architectures for high availability.
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Power Supply
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Redundant, wide-range DC or AC power supply inputs (e.g., 24-48 V DC / 110-230 V AC).
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Operating Temperature
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0°C to +60°C (for controller cabinet environment).
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Certifications
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Complies with IEEE 421.5, IEC 60255, IEC 61850, UL, CE, and other international standards and grid codes.
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Key Features and Advantages
ABB XVC768116 3BHB007211R116 is distinguished by its advanced control algorithms and grid support features. A key advantage is its high-performance, adaptive control loops that ensure precise voltage regulation (typically within ±0.5%) and fast dynamic response to system transients. The integrated, sophisticated Power System Stabilizer (PSS) is critical for utility generators, actively suppressing power swings to improve the stability limits of the interconnected grid. This makes the controller an essential tool for enhancing overall power system reliability.
Comprehensive protection and diagnostic intelligence are engineered into its core. The controller includes a full suite of generator and excitation system protective functions, such as loss of excitation and over/under excitation limiting, safeguarding the valuable asset. It features extensive self-diagnostics that continuously monitor hardware health, communication links, and signal validity. Detailed event logging and high-resolution disturbance recording (with pre- and post-fault waveforms) provide invaluable data for rapid fault analysis and root cause determination, enabling condition-based maintenance strategies.
Future-proof connectivity and operational excellence are fundamental benefits. Native support for IEC 61850 enables seamless integration into modern digital substations, facilitating efficient engineering and interoperability. The intuitive local HMI simplifies daily operations and troubleshooting. The controller can be easily integrated with higher-level plant control systems (DCS) and asset performance management platforms (like ABB Ability™). For generator owners, the XVC768116 delivers not only superior technical performance but also the operational insights and connectivity required for modern, data-driven power generation, ensuring compliance, maximizing availability, and optimizing the total cost of ownership.
Application Areas
The ABB XVC768116 excitation controller is designed for high-performance applications involving large synchronous machines.
Its primary domain is utility-scale power generation:
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Thermal Power Plants (Coal, Gas, Oil-fired): For main generator excitation.
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Hydroelectric Power Plants: For both large and small hydro generators.
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Nuclear Power Plants: Where reliability and performance are paramount.
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Combined-Cycle Gas Turbine (CCGT) Plants.
It is also extensively used in large industrial co-generation plants in sectors like pulp & paper, chemicals, and metals. For synchronous condensers, it provides precise and fast reactive power control for grid voltage support. Additionally, it is applied in large synchronous motor drives for critical compressors, pumps, and mills. Essentially, the XVC768116 is the controller of choice for any synchronous machine application demanding the highest levels of control performance, reliability, and grid integration capabilities, typically for generators in the range of 50 MVA to over 1000 MVA.
Related Products
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ABB Thyristor Power Unit (e.g., UNITROL® PU): The power conversion stage that supplies the field current, controlled by the XVC768116.
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Excitation Transformer: Steps down the generator voltage to supply the thyristor bridge.
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Field Circuit Breaker and Discharge Resistor: For field circuit protection and de-energization.
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ABB Generator Protection Relay (e.g., REG670): A dedicated protection relay for comprehensive generator protection, working alongside the AVR.
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ABB ToolKit SPAC Software: The engineering tool for configuration, commissioning, simulation, and monitoring of the UNITROL controller.
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Voltage and Current Transformers (VTs/CTs): Provide the measurement signals to the controller.
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ABB Ability™ Digital Solutions: For advanced analytics and optimization of the excitation system and generator.
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