ABB UNITROL1000-15 3BHE014557R0003 Automatic Voltage Regulator (AVR)

ABB UNITROL 1000-15 (3BHE014557R0003) Technical Parameters and Functions

The ABB UNITROL 1000-15 (Order Code: 3BHE014557R0003) is a microprocessor-based automatic voltage regulator (AVR) designed for precise control of synchronous generators, exciter systems, and industrial applications requiring advanced excitation control. Below is a detailed overview of its technical specifications and functionalities:

1. Key Technical Parameters

Input/Output Specifications

• Input Voltage Range:
  • Generator Terminal Voltage: Typically 100–690 V AC (phase-to-phase), configurable via settings.
  • Frequency Range: 45–65 Hz (adaptable to generator frequency).
  • Auxiliary Power Supply: 24–48 V DC or 110–230 V AC/DC (dependent on configuration).
• Output (Excitation Current):
  • Continuous Current Rating: Up to 15 A DC (for field winding excitation).
  • Short-Time Overload Capacity: 20 A DC for 30 seconds.

Control and Performance

• Voltage Regulation Accuracy: ±0.5% of setpoint under steady-state conditions.
• Response Time: <50 ms for voltage deviations.
• Control Algorithms: PID-based with adaptive tuning for dynamic stability.

Environmental Ratings

• Operating Temperature: -25°C to +55°C.
• Storage Temperature: -40°C to +85°C.
• Humidity: Up to 95% non-condensing.
• Protection Class: IP20 (for panel mounting; higher protection with optional enclosures).

Communication Interfaces

• Standard Protocols:
  • Modbus RTU (RS-232/RS-485).
  • CANopen (for integration with PLCs and SCADA systems).
• Optional Protocols: IEC 61850, Profibus DP.
• HMI Integration: Local control via LCD interface or remote via software tools (e.g., ABB’s Toolkit or Composer).

2. Core Functions and Features

Voltage and Reactive Power Control

• Automatic Voltage Regulation (AVR): Maintains generator terminal voltage within tight tolerances, even under varying load conditions.
• Reactive Power Compensation: Supports parallel generator operation with reactive power droop control for load sharing.
• Power Factor Control: Adjusts excitation to maintain a user-defined power factor.

Excitation System Management

• Field Current Limiting: Protects the exciter and rotor windings from overcurrent.
• Under-Excitation Limiter (UEL): Prevents generator instability during leading power factor operation.
• Over-Excitation Limiter (OEL): Safeguards against rotor overheating.

Protection and Diagnostics

• Built-in Protections:
  • Over/under voltage.
  • Over/under frequency.
  • Loss of excitation (LOE).
  • Field ground fault detection.
  • Rotor temperature monitoring (via PT100 inputs).
• Self-Diagnostics: Continuous monitoring of hardware and software integrity with alarm logging.

Advanced Control Modes

• Modes of Operation:
  • AVR Mode: Standard voltage regulation.
  • FCR (Field Current Regulation) Mode: Direct control of excitation current.
  • PF/var Mode: Reactive power or power factor-based control.
• Black Start Capability: Supports generator start-up in islanded grids.

User Interface and Programmability

• LCD Display: 4-line graphical interface for real-time monitoring (voltage, current, active/reactive power, alarms).
• Parameterization: Customizable setpoints, limits, and curves via front panel or software.
• Event Logging: Stores up to 1,000 time-stamped events for fault analysis.

Compatibility

• Exciters: Compatible with both static and brushless excitation systems.
• Generators: Suitable for hydro, gas, diesel, or steam turbine-driven generators up to 100 MVA.

3. Applications

• Power Generation: Hydroelectric plants, thermal power stations, diesel gensets.
• Industrial: Grid synchronization, process industries with captive power units.
• Renewables: Backup control for hybrid solar/wind-diesel systems.

4. Advantages

• High Reliability: Dual redundant power supplies and fail-safe design.
• Flexibility: Scalable for retrofitting older systems or new installations.
• Cybersecurity: Optional password protection and role-based access control.