ABB UCD240A101 3BHE022287R0101 Excitation Control Board – Functional Overview
1. Primary Function
Generator Excitation Control: Serves as the core processing unit for regulating field current in synchronous generators/motors (typical range: 0-300V DC, ±0.25% accuracy)
Automatic Voltage Regulation (AVR): Maintains grid voltage stability through PID control algorithms with <20ms response time
2. System Architecture
DSP-Based Control: Features a 32-bit digital signal processor for real-time calculations (sampling rate: 10kHz)
Redundant Operation: Supports 1-out-of-2 redundancy with automatic bumpless transfer
Communication Interfaces:
IEC 61850 for substation automation
Modbus RTU/TCP for SCADA integration
ABB 800xA compatibility via AF100 protocol
3. Protection Functions
Field Overcurrent: 110% In; <50ms
Underexcitation: 85% V/Hz; <100ms
Overvoltage: 110% Vn; <20ms
Loss-of-Field: 40% If; <500ms
4. Key Specifications
Inputs: 3-phase VT (100-480V AC), CT (1A/5A)
Outputs: Thyristor firing pulses (6/12-pulse configurable)
Environmental: -25°C to +70°C operation (conformal coated)
5. Typical Applications
Power Plants: Hydro/thermal generator excitation (up to 600MW)
Industrial Drives: Large synchronous motor control
Marine Power Systems: Shipboard generation
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