Description
Woodward 9905-214
Technical Specifications
- Synchronization Method: Phase-match with adjustable slip frequency and voltage match.
- Control Output: Analog bias to governor and AVR, plus breaker close relay.
- Measurement Inputs: True RMS voltage, frequency, and phase angle.
- Power Supply: Standard industrial DC or AC voltage.
Functional Features
- Automatic Synchronization: Calculates the exact closure point for zero transient impact.
- Load Control: Manages base load and load ramp rates post-synchronization.
- Permissive Logic: Prevents breaker closure if synchronization criteria are not met.
- Digital Display: Provides real-time status of sync parameters.
Application Scenarios
Essential for generator paralleling switchgear, automatic transfer switches (ATS), and power plant synchronization panels.
Performance Parameters
- Sync Accuracy: Phase angle matching within ±2 degrees.
- Voltage Match: Within ±1% of bus voltage.
Material Composition
High-reliability digital electronics housed in a ruggedized metal enclosure with conformal-coated PCBs.
Structural Characteristics
- Interface: Front-panel LCD display and navigation keypad.
- Connectors: Multi-pin connectors for PT/CT inputs, control outputs, and communications.
Working Principle
The module continuously measures the generator and bus voltages. It calculates the slip frequency and phase difference, adjusting the governor speed and AVR voltage setpoints. When the phase angle approaches zero at the optimal slip rate, it energizes the breaker close relay.
Installation Requirements
- Connect voltage transformers with correct polarity and phase rotation.
- Ensure the breaker close circuit is properly interlocked.
- Mount in a vibration-free environment.
Usage Precautions
- Always verify phase rotation before first synchronization.
- Test the permissive logic to ensure the breaker cannot close out-of-sync.
- Keep synchronization parameters tuned to the specific generator’s inertia.
