The IS200TTURH1B is a Turbine Protection Input Terminal Board designed by General Electric (GE) for use in its Mark VI and Mark VIe series control systems. This board is primarily used in conjunction with the VTUR processor board to perform critical protection functions such as turbine speed monitoring, automatic synchronization, breaker control, and shaft voltage/current monitoring. The IS200TTURH1B is part of the original TTUR series and is suitable for both Simplex and Triple Modular Redundant (TMR) control systems. It is widely used in power plants, industrial turbines, and other rotating machinery for automatic control and protection systems.
The IS200TTURH1B terminal board integrates various input and output interfaces, including passive magnetic pick-up speed sensors, generator potential transformers, bus potential transformers, shaft voltage/current sensors, breaker status inputs, and relay outputs. Its design meets industrial-grade standards, featuring high reliability, strong anti-interference capability, and flexible configuration options.
II. Main Functions
The primary functions of the IS200TTURH1B include, but are not limited to, the following:
Turbine Speed Monitoring
Supports up to 12 passive magnetic pick-up pulse rate sensors for measuring turbine rotational speed, with a frequency range from 2 Hz to 20 kHz and accuracy up to 0.05%.
Automatic Synchronization Control
Receives generator voltage and bus voltage signals. In conjunction with the VTUR processor and the excitation system, it enables automatic synchronization and grid connection of the generator.
Breaker Control
Provides 125 V DC output to the main breaker coil (52G). Control is ensured via three relays (K25, K25P, K25A) connected in series for safe breaker closing.
Shaft Voltage/Current Monitoring
Monitors induced voltage and current on the turbine shaft, aiding in diagnosing issues like poor shaft grounding or insulation faults.
Diagnostic and Self-Test Functions
The board supports various diagnostic functions, including relay feedback, power loss detection, slow sync relay detection, ensuring reliable system operation.
TMR Application Support
In Triple Modular Redundant systems, the IS200TTURH1B connects to three VTUR boards. Input signals are processed through triple-channel redundancy, and output signals are controlled via a two-out-of-three voting logic.
III. System Applications
1. Application in Mark VI Systems
In Mark VI systems, the IS200TTURH1B works with the VTUR processor board, supporting both Simplex and TMR applications. In TMR mode, the TTURH1B connects to three VTUR boards via six connectors (JR1, JS1, JT1, JR5, JS5, JT5), enabling redundant signal acquisition and control.
2. Application in Mark VIe Systems
The Mark VIe system typically uses the newer TTURH1C board. The TTURH1B does not directly support I/O Packs. Therefore, compatibility must be verified if using TTURH1B in a Mark VIe system. For details on the TTURH1C, refer to GEI-100575.
3. Typical Application Scenarios
Gas turbines, steam turbines, combined cycle power plants
Industrial turbomachinery
Automatic synchronization and grid connection systems
Shaft voltage/current monitoring systems
Main breaker closing control
IV. Installation and Wiring Instructions
1. Mounting Location
The TTURH1B is typically mounted inside a control cabinet using a surface mount method. Sufficient space should be for wiring and maintenance access.
2. Wiring Instructions
TB1/TB2: Used for connecting magnetic pick-ups, shaft voltage/current sensors, PT signals, and relay outputs.
TB3: Optional connector for TTL active speed sensor inputs, requiring an external power supply.
Shield Terminals: A shield termination strip attached to chassis ground is located left of each terminal block for connecting signal shield grounds.
3. Jumper Configuration
JP1, JP2: Used to select the drive mode for relays K25 and K25P. In Simplex mode, set jumpers to Simplex. In TMR mode, set jumpers to TMR.
4. Cable Connections
Simplex Systems: Use connectors JR1 and JR5.
TMR Systems: Use all six connectors (JR1, JS1, JT1, JR5, JS5, JT5).
V. Diagnostics and Maintenance
The IS200TTURH1B, in conjunction with the VTUR processor, implements several diagnostic functions to ensure high system reliability:
| Diagnostic Item | Description |
| Relay Driver Feedback | Checks if the relay drive signal matches the control signal. |
| Relay Contact Feedback | Checks if the contact state matches the control signal. |
| Power Loss Detection | Checks if the 125 V DC power supply is normal. |
| Slow Sync Relay Detection | Detects if the synchronizing relay response is too slow. |
| K25 Relay Stuck Detection | Detects if the K25 relay is stuck. |
| Composite Diagnostic Alarm | Any fault triggers the L3DIAG_VTUR alarm. |
| ID Chip Verification | Verifies if the connector ID matches, preventing hardware incompatibility. |
All diagnostic signals can be reset using the RESET_DIA signal, and fault latching is supported.
VI. Configuration and Compatibility
Configuration Method: Configured only via jumpers; no DIP switches are present.
Compatibility: Supports operation with VTUR, VPRO, TREG, and other boards.
Important Note: The TTURH1B is not compatible with I/O Packs. Mark VIe systems require the TTURH1C board.
