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- Woodward
- 8200-205
- Overspeed Protection
- USA
- 482.6 × 310.4 × 142.7 mm
- 2.35 kg
- Xiamen, China
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Product Overview
The Woodward 8200-205 Overspeed Protection is a protection component used in turbine and prime-mover control systems to respond to excessive rotational speed.
Overspeed is a critical condition in rotating machinery. If a turbine or other high-speed prime mover accelerates beyond its permitted operating range, the resulting mechanical stress can become a serious equipment hazard. An overspeed protection device therefore operates separately from normal operating control functions, with its main purpose being to detect an unacceptable speed condition and initiate the appropriate protective action.
The 8200-205 is relevant to turbine installations where independent speed protection forms part of the overall machine safety arrangement. It works alongside normal turbine control hardware rather than replacing the governor or primary control system.
During troubleshooting, the protection circuit should be considered together with speed sensing, trip logic, actuator mechanisms, shutdown devices, wiring, and the turbine itself. An unexpected trip does not necessarily indicate a defective protection module.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Woodward |
| Model | 8200-205 |
| Product Type | Overspeed Protection |
| Main Function | Turbine / Prime-Mover Overspeed Protection |
| System Role | Protective Control Component |
| Control Type | Electronic Protection |
| Application | Turbine and Rotating Machinery Protection |
| Typical Use | Detection and Response to Overspeed Conditions |
| Dimensions | 482.6 × 310.4 × 142.7 mm |
| Weight | 2.35 kg |
Product Features
The 8200-205 is intended for applications where excessive rotational speed must be detected and addressed through a dedicated protection function.
Key characteristics include:
- Overspeed protection functionality
- Intended for turbine and prime-mover systems
- Electronic protective-control application
- Works with speed-sensing circuits
- Can form part of a turbine shutdown arrangement
- Separate from normal speed-regulation functions
- Suitable for industrial rotating equipment
- Applicable to turbine protection systems
- Dimensions of 482.6 × 310.4 × 142.7 mm
- Stated weight of 2.35 kg
The protection function should be evaluated as part of the complete turbine safety and shutdown architecture.
Working Principle
A practical overspeed protection path can be viewed as:
Speed Sensor → Overspeed Protection → Trip Logic → Shutdown / Actuator → Prime Mover
During normal operation, the turbine governor or control system manages the machine’s operating speed. The overspeed protection circuit serves a different purpose: it monitors for a speed condition that requires protective action.
If the monitored speed reaches an unacceptable condition, the protection system can initiate the configured trip response. The resulting action may involve the turbine shutdown mechanism or another final protective element, depending on the equipment architecture.
This separation is important. Normal speed control attempts to keep the turbine at its commanded operating point, while overspeed protection is concerned with preventing continued operation under an unsafe speed condition.
For this reason, the protection system should not be treated simply as another speed-control module.
Industrial Applications
The 8200-205 is relevant to rotating machinery where excessive speed requires a dedicated protective function.
| Application | Typical Use |
|---|---|
| Steam Turbines | Overspeed shutdown protection |
| Industrial Turbines | Rotational-speed protection |
| Power Generation | Prime-mover protection |
| Turbine-Driven Compressors | High-speed equipment protection |
| Mechanical Drive Systems | Overspeed detection |
| Process Turbine Equipment | Protective shutdown |
| Industrial Prime Movers | Speed-limit protection |
| Turbine Auxiliary Systems | Protective control functions |
The exact protection arrangement depends on the turbine, speed-sensing system, shutdown mechanism, and overall safety architecture.
Compatible System Components
The 8200-205 normally operates within a larger turbine protection system.
| Component | Function |
|---|---|
| 8200-205 | Provides overspeed protection functionality |
| Speed Sensor | Measures turbine or shaft speed |
| Turbine Governor | Handles normal speed regulation |
| Trip Logic | Determines the required protective response |
| Shutdown Actuator | Initiates the physical shutdown action |
| Control Valve | Reduces or stops the energy supplied to the turbine where applicable |
| Turbine | Rotating prime mover being protected |
| Control Wiring | Transfers sensing and trip signals |
| Power Supply | Supplies the protection hardware |
| Alarm / Monitoring System | Reports abnormal operating conditions |
Normal control and emergency protection should be coordinated but should not be confused with one another during system analysis.
Installation and Maintenance
Overspeed protection equipment requires careful handling because incorrect configuration or wiring can affect the protective function of the turbine.
Before replacing the 8200-205, document the existing protection arrangement and identify the associated speed sensors, trip circuits, shutdown devices, and wiring.
Recommended checks include:
- Confirm the complete 8200-205 part number.
- Verify the turbine or prime-mover application.
- Check protection-system power connections.
- Inspect speed-sensor wiring.
- Verify the speed-sensing arrangement.
- Inspect trip and shutdown wiring.
- Check connectors for loose or damaged contacts.
- Inspect grounding and shielding where applicable.
- Review the existing protection configuration.
- Check the associated shutdown actuator.
- Inspect the mechanical shutdown mechanism.
- Investigate the cause of unexpected trips before resetting the system.
- Perform controlled protection-system testing according to the applicable maintenance procedure.
If an overspeed trip occurs during normal operation, the trip should not simply be reset repeatedly. The recorded speed condition, sensor signal, protection circuit, actuator response, and turbine operating condition should be investigated first.
Recommended Related Models
For the 8200-205, related components should be selected according to the turbine’s protection and control architecture.
| Model / Component | Type | Primary Function | Application |
|---|---|---|---|
| Woodward 8200-205 | Overspeed Protection | Detects and responds to excessive speed | Turbine protection |
| Woodward 8200 Series Control Modules | Control Hardware | Electronic turbine control functions | Industrial turbine systems |
| Woodward Speed Sensors | Sensing Device | Turbine speed measurement | Overspeed and governor feedback |
| Woodward Turbine Governors | Governor | Normal speed regulation | Turbine operation |
| Woodward Turbine Actuators | Actuator | Mechanical control or shutdown action | Turbine systems |
| Turbine Protection Systems | Protection System | Protective shutdown and monitoring | Power generation and industry |
When selecting a replacement, verify the complete protection architecture, speed-sensor arrangement, trip circuit, shutdown mechanism, wiring, and system configuration. A physically similar module should not be assumed to provide the same protection function.
Key Advantages
- Overspeed protection functionality
- Intended for turbine protection systems
- Works with speed-sensing circuits
- Supports protective shutdown arrangements
- Separate role from normal turbine speed regulation
- Suitable for industrial rotating machinery
- Applicable to power-generation equipment
- Dimensions of 482.6 × 310.4 × 142.7 mm
- Stated weight of 2.35 kg
Technical FAQs
Why is overspeed protection separate from the normal turbine governor?
The governor regulates the turbine during normal operation, while overspeed protection provides a dedicated response to an excessive-speed condition. Keeping these functions distinct helps maintain a separate protective layer when normal regulation is no longer sufficient.
What should be investigated after an unexpected overspeed trip?
The turbine speed record, speed sensor, sensor wiring, protection circuit, trip logic, shutdown actuator, and mechanical turbine condition should be examined. Repeatedly resetting the system without identifying the cause can conceal a developing fault.
Can a faulty speed sensor cause an overspeed protection trip?
Yes. An incorrect or unstable speed signal can affect the protection system’s interpretation of turbine speed. Sensor condition, wiring, connections, shielding, and signal quality should therefore be checked when investigating an unexplained trip.
How does the 8200-205 differ from a turbine speed-control module?
An overspeed protection component focuses on detecting and responding to excessive speed, whereas a governor or normal control module manages the turbine’s operating speed during routine operation. They serve different functions within the overall control architecture.