Description
The ABB/Woodward ASD1B (P/No.: LR20131) is a precision Automatic Synchronizer and Load Sharing Control Unit. It is designed to manage the critical process of connecting an AC generator to an existing electrical grid or paralleling multiple generators in an islanded microgrid. By monitoring the voltage, frequency, and phase angle of both the generator and the busbar, the ASD1B calculates the necessary speed and voltage corrections required to achieve “perfect” synchronization, ensuring a seamless connection without damaging mechanical or electrical transients.
⚙️ Technical Specifications
- Module Type: Automatic Synchronizer / Synchronization Control Unit
- Part Number: LR20131 (Rev: NEW)
- Function: Frequency and phase angle matching; voltage matching (if equipped)
- Control Outputs: Speed bias/trim output to the engine governor; voltage bias/trim to the AVR (Automatic Voltage Regulator)
- Input Sensing: Generator and Busbar voltage/frequency (AC inputs)
- Status Monitoring: Internal relay outputs for “Synchronized” indication and circuit breaker control
- Mounting: Panel or DIN-rail mount design for generator control panels
- Protection: Integrated supervision of the sync window (phase/time limits)
- Reliability: Built to withstand the high-vibration environment of engine rooms
- Operating Temperature: Standard industrial range suitable for generator enclosures
📋 Recommended Woodward/ABB Power Management Components
- Engine Governor (e.g., Woodward 2301A/D): Receives the speed bias signal from the ASD1B.
- Automatic Voltage Regulator (AVR): Receives the voltage bias signal for precise voltage matching.
- Circuit Breaker Interface: Control relay to initiate the closing of the generator breaker upon sync.
- PTs (Potential Transformers): Essential for stepping down grid/generator voltages to safe levels for the ASD1B.
- Shielded Signal Wiring: Required to prevent EMI from impacting the delicate bias signals.
- Load Sharing Module: For managing real/reactive power distribution after the generator is synchronized.
- System Power Supply: Regulated DC power for the control unit.
- Sync Check Relay: A secondary, redundant safety device to prevent accidental out-of-phase closing.
- Diagnostic/Commissioning Tool: For setting sync window thresholds (e.g., phase angle/time parameters).
- Emergency Stop Circuitry: Must be integrated to disable the synchronization output during a shutdown event.
