The Woodward SPM-A Synchronizer 9906-121 Rev.B is a specialized analog control device engineered to automatically synchronize an incoming generator with a busbar. By precisely matching the frequency, phase angle, and voltage of the generator to the system, it ensures a seamless and safe closure of the circuit breaker, preventing electrical and mechanical stress on the equipment.
Product Overview
The 9906-121 model is part of the Woodward Speed and Phase Matching (SPM) family. This specific revision (Rev.B) is designed for high reliability in industrial power plants and marine environments. It provides a bias signal to the electronic speed governor to bring the generator into a synchronous state with the mains or another generator.
Technical Specifications (Datasheet)
| Feature | Specification |
| Model Number | 9906-121 |
| Revision | B |
| Input Voltage (Bus/Gen) | 115 or 230 VAC (Configurable) |
| Frequency Range | 50 or 60 Hz |
| Phase Offset Capability | Adjustable from -10° to +10° |
| Voltage Matching Range | ±1% to ±10% (Depending on Settings) |
| Power Consumption | Approximately 5 VA |
| Operating Temperature | -40°C to +70°C |
| Output Type | Analog Bias Signal (Contact Closure for Breaker) |
Key Technical Features
- Automatic Phase Matching: Continuously monitors the phase relationship between the generator and the bus.
- Speed Bias Output: Interfaces directly with Woodward and other compatible electronic governors to adjust engine RPM.
- Adjustable Dynamics: Features pots for adjusting the gain and stability to match the response time of different prime movers.
- Breaker Closure Logic: Only sends the “Close” command when frequency, phase, and voltage windows are all simultaneously satisfied.
Country of Origin
Country of Origin: USA (United States of America)
Primary Application Fields
The Woodward SPM-A is essential for power system stability in:
- Emergency Standby Power: Ensuring backup generators sync quickly to critical loads.
- Microgrids: Managing the connection between local generation and the main utility grid.
- Marine Power Management: Synchronizing shipboard diesel generators.
- Combined Heat and Power (CHP): Industrial plants utilizing onsite turbine generation.
Operating Instructions
- Mounting: Install the synchronizer in a vibration-free environment, typically within the generator control panel.
- Voltage Sensing: Connect the potential transformer (PT) secondaries from both the bus and the generator to the appropriate input terminals.
- Governor Interface: Connect the SPM-A output to the speed trim or auxiliary input of the engine governor.
- Testing: Perform a “Live Bus/Dead Gen” test first to verify wiring, then proceed to a live synchronization check while monitoring a synchroscope.
- LED Monitoring: Use the front-panel indicators to verify that the unit is sensing both voltages and is actively correcting the speed.
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