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- CSC3BUERADAP
- SPM-A Synchronizer with 1% Voltage Matching
- USA
- 120 × 100 × 60 mm
- 1.2 kg
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Product Overview
The Woodward CSC3BUERADAP SPM-A Synchronizer with 1% Voltage Matching is identified as a generator synchronization device intended to coordinate the electrical conditions of an incoming generator with an energized bus. Its primary role is to match frequency and phase angle and, with its voltage-matching function, help bring generator voltage into the required relationship with the bus before the generator circuit breaker closes.
In a power-generation installation, a generator cannot be connected to an energized bus solely because its frequency appears correct. The phase relationship and voltage difference must also fall within the limits established for the installation. If these conditions are not satisfied, closing the breaker can produce substantial electrical and mechanical transients. The synchronizer coordinates the adjustments needed to prepare the incoming generator for connection.
The SPM-A synchronization principle uses speed-bias signals to influence a compatible governor and voltage-correction signals to interface with a suitable voltage regulator. The governor adjusts prime-mover speed, while the excitation-control system adjusts generator voltage. The synchronizer evaluates the resulting electrical conditions and provides a breaker-close command when the configured synchronization requirements are met.
The 1% voltage-matching designation distinguishes this configuration from SPM-A versions without automatic voltage matching or models with different voltage-matching specifications. The exact CSC3BUERADAP ordering reference should be retained when identifying the required replacement, particularly when the installed system uses a specific output arrangement or customized assembly designation.
The synchronizer is one component of the complete generator-paralleling system. Correct operation depends on compatible voltage-sensing circuits, the governor, excitation controls, the breaker-control circuit, and the required protective interlocks.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Woodward |
| Model / Part Number | CSC3BUERADAP |
| Product Family | SPM-A |
| Product Type | Synchronizer with 1% Voltage Matching |
| Primary Function | Generator frequency, phase, and voltage matching |
| Voltage-Matching Specification | 1% |
| Operating Frequency | 50/60 Hz for the corresponding standard SPM-A configuration |
| Generator and Bus Voltage Inputs | 115 or 230 V AC RMS for the corresponding standard SPM-A configuration |
| Phase-Matching Function | Automatic phase and frequency matching |
| Breaker-Close Output | Normally open relay contact on the standard SPM-A configuration |
| Operating Modes | RUN, CHECK, PERMISSIVE, OFF on the standard SPM-A configuration |
| Power Consumption | Maximum 5 W on the standard SPM-A configuration |
| Dimensions | 120 × 100 × 60 mm |
| Weight | 1.2 kg |
Product Features
- Automatic frequency matching: Sends speed-adjustment signals to a compatible governor to reduce the frequency difference between the incoming generator and the energized bus.
- Phase-angle synchronization: Coordinates speed correction so the incoming generator approaches the configured phase-matching window.
- 1% voltage matching: Supports voltage correction through a compatible excitation or voltage-regulation system.
- Automatic breaker-close command: Provides the synchronization-related closing signal when the configured conditions are satisfied.
- Selectable operating modes: The standard SPM-A platform supports RUN, CHECK, PERMISSIVE, and OFF for operating and testing requirements.
- Adjustable synchronization dynamics: Allows the control response to be matched to the behavior of the connected prime mover and governing system.
- Governor interface options: The SPM-A platform supports different output arrangements for compatible Woodward speed and load-sharing controls.
- Generator-paralleling integration: Coordinates electrical matching with the surrounding generator control and breaker circuits.
Working Principle
The synchronizer compares voltage signals from the incoming generator and the energized bus. These signals allow the device to evaluate the frequency difference, phase relationship, and voltage mismatch before connection.
A typical synchronization sequence follows this path:
Incoming Generator and Energized Bus → Voltage-Sensing Circuits → SPM-A Synchronizer → Governor and Voltage Regulator → Breaker-Close Circuit
When the incoming generator frequency differs from the bus frequency, the synchronizer sends a speed-bias signal to the compatible governor. The governor adjusts the prime mover’s speed, changing the generator frequency and influencing the rate at which the phase angle moves toward the required closing position.
Voltage matching operates through a separate control path. If the generator voltage differs from the bus voltage, the synchronizer provides a correction signal to the compatible voltage regulator or excitation-control circuit. The regulator adjusts generator excitation to bring the voltage toward the required matching condition.
The 1% voltage-matching specification describes the matching capability of the designated SPM-A configuration. Actual performance depends on the associated regulator, sensing accuracy, wiring, and system adjustment.
Once the configured synchronization conditions are satisfied, the synchronizer can issue a breaker-close command. The command must be coordinated with the circuit breaker’s mechanical operating time and the external closing circuit so that the generator is connected within the permitted synchronizing window.
The standard SPM-A platform provides several operating modes. RUN supports automatic synchronization and breaker closure; CHECK allows synchronization behavior to be evaluated without normal breaker closure; PERMISSIVE checks synchronization conditions without normal speed trimming or voltage matching; and OFF disables the synchronizing function.
The synchronizer does not independently control prime-mover speed or generator excitation. Those functions remain with the connected governor and voltage regulator. Generator protection and any required independent synchronism-check functions must also be provided as part of the complete installation.
Role in the Generator Synchronization Architecture
The CSC3BUERADAP SPM-A synchronizer occupies the coordination layer between generator electrical measurements and the external control equipment responsible for speed, excitation, and breaker operation.
Generator and Bus Voltage Measurements → Synchronizer → Governor and Voltage Regulator → Breaker-Close Circuit
| System Component | Function |
|---|---|
| Woodward CSC3BUERADAP | Coordinates generator frequency, phase, and voltage matching |
| Incoming Generator | Supplies the electrical source to be synchronized |
| Energized Bus | Provides the electrical reference for matching |
| Generator Voltage-Sensing Circuit | Supplies the incoming generator voltage signal |
| Bus Voltage-Sensing Circuit | Supplies the bus voltage reference |
| Governor or Load-Sharing Control | Adjusts prime-mover speed in response to synchronizer commands |
| Automatic Voltage Regulator | Controls generator excitation and voltage |
| Breaker-Close Relay | Provides the synchronization-related closing command |
| Generator Circuit Breaker | Connects the incoming generator to the bus |
| Synchronism-Check Relay | Provides additional closing supervision where required |
| Generator Protection System | Detects electrical faults and initiates protective action |
Industrial Applications
| Application | Typical Use |
|---|---|
| Diesel Generator Plants | Matching incoming generator frequency, phase, and voltage before paralleling |
| Gas Engine Power Stations | Coordinating governor and excitation adjustments during synchronization |
| Steam-Turbine Generator Sets | Preparing turbine-driven generators for connection to an energized bus |
| Standby Power Systems | Synchronizing additional generating capacity where parallel operation is required |
| Industrial Power Plants | Connecting generators to a common electrical bus |
| Combined Heat and Power Facilities | Coordinating generator entry into an existing plant power system |
| Remote Power Stations | Synchronizing generators in isolated or local power networks |
| Multiple Generator Installations | Bringing individual generating units online under coordinated control |
| Industrial Utility Systems | Integrating synchronization into generator switchgear |
| Generator Retrofit Projects | Replacing an existing synchronizer while preserving the required control interfaces |
Installation and Maintenance
- Verify the model reference: Confirm CSC3BUERADAP against the installed unit and equipment identification records before selecting a replacement.
- Check the voltage-matching requirement: Verify that the application requires 1% voltage matching and that the installed voltage regulator supports the corresponding control arrangement.
- Inspect generator and bus sensing: Check the voltage-sensing circuits, phase connections, and wiring polarity against the electrical drawings.
- Verify the input configuration: Ensure that the generator and bus voltage signals match the installed synchronizer’s specified input arrangement.
- Check governor compatibility: Confirm that the synchronizer output arrangement is suitable for the connected governor or load-sharing control.
- Inspect the excitation interface: Verify the voltage-correction connections and ensure that the voltage regulator responds in the correct direction.
- Check the breaker-close circuit: Inspect relay wiring, contact loading, external interlocks, and the breaker operating circuit.
- Review operating-mode wiring: Check the mode selector and verify that the selected operating mode matches the intended commissioning or operating procedure.
- Inspect panel connections: Check terminal security, cable condition, grounding, and separation between sensing and power wiring.
- Test synchronization without closure: Use the applicable test mode to evaluate frequency correction, phase matching, and voltage matching without permitting an unintended breaker-close operation.
- Validate the complete sequence: Under an approved commissioning procedure, verify governor response, voltage correction, synchronizing conditions, and breaker-close coordination.
- Record the configuration: Document the model reference, input arrangement, governor interface, voltage-matching settings, operating mode, and commissioning results.
Compatible System Components
| Component | Function |
|---|---|
| Woodward CSC3BUERADAP | Provides the specified SPM-A synchronization function |
| Compatible SPM-A Voltage-Matching Configuration | Supports generator voltage correction during synchronization |
| Woodward 2301 Load-Sharing Control | Supports compatible high-impedance synchronizer output arrangements |
| Woodward 2301A Load-Sharing and Speed Control | Supports compatible low-impedance output arrangements |
| Woodward Electrically Powered Governor (EPG) | Controls prime-mover speed in supported configurations |
| Automatic Voltage Regulator | Adjusts generator excitation and voltage |
| Generator Voltage-Sensing Circuit | Supplies generator voltage measurements |
| Bus Voltage-Sensing Circuit | Supplies the reference voltage measurements |
| Generator Circuit Breaker | Connects the incoming generator to the energized bus |
| Breaker-Control Circuit | Processes the synchronizer’s closing command |
| Synchronism-Check Relay | Provides additional closing supervision where required |
| Generator Protection Equipment | Provides electrical fault protection and required interlocks |
Recommended Related Models
| Model | Product Type | Selection Consideration |
|---|---|---|
| Woodward CSC3BUERADAP | SPM-A Synchronizer with 1% Voltage Matching | Reference model; preserve the complete ordering designation when replacing the installed unit |
| Woodward 9907-029 | SPM-A Synchronizer with 1% Voltage Matching | Standard SPM-A reference for 50/60 Hz operation with a ±10° phase window |
| Woodward 9905-005 | SPM-A Synchronizer with 1% Voltage Matching | Standard configuration with a ±5° phase window |
| Woodward 9905-001 | SPM-A Synchronizer without Voltage Matching | Alternative for systems where voltage matching is handled separately |
| Woodward 9905-003 | SPM-A Synchronizer with 5% Voltage Matching | Alternative voltage-matching specification |
| Woodward 9905-006 | SPM-A Synchronizer with 0.5% Voltage Matching | Alternative with a different voltage-matching specification |
| Woodward 9905-009 | SPM-A Synchronizer with 10% Voltage Matching | Alternative voltage-matching specification for suitable applications |
Key Advantages
- Coordinates generator frequency and phase before paralleling.
- Supports a specified 1% voltage-matching function.
- Provides a synchronization-related breaker-close command.
- Works with compatible governor and excitation-control arrangements.
- Supports testing and operating modes on the standard SPM-A platform.
- Helps coordinate generator connection with the surrounding control and protection circuits.
Technical FAQs
Why is 1% voltage matching important for the CSC3BUERADAP?
Voltage matching helps reduce the difference between incoming generator voltage and bus voltage before the circuit breaker closes. The specified 1% matching capability identifies the intended configuration, while actual performance depends on the regulator and measurement circuit.
How does the synchronizer correct a generator that is running at the wrong frequency?
It sends a speed-bias command to a compatible governor. The governor changes prime-mover speed, adjusting generator frequency and moving the phase relationship toward the configured synchronization window.
What is the difference between CHECK and PERMISSIVE operation on the SPM-A platform?
CHECK is used to evaluate synchronization behavior without normal breaker closure. PERMISSIVE checks whether synchronization conditions are acceptable without normal speed trimming or voltage matching. The external mode wiring and breaker-control logic must implement the intended behavior correctly.
Can the CSC3BUERADAP be replaced directly with a 9907-029?
Do not assume direct interchangeability from the shared SPM-A designation and 1% voltage-matching function alone. Compare the complete ordering reference, phase window, output arrangement, connections, and physical installation requirements before substitution.