Overview
The IS200VTURH1BAB is a Vibration Transducer Interface Module manufactured by General Electric for the Mark VI turbine control platform. It processes turbine speed and related monitoring signals, supporting overspeed protection and automatic generator synchronization. The module interfaces with passive magnetic speed pickups and communicates trip signals through the turbine protection circuitry. It also supports shaft voltage and current monitoring.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | IS200VTURH1BAB |
| Brand | General Electric (GE) |
| Series | Mark VI |
| Product Type | Vibration Transducer Interface Module |
| Board Rating | 125 VDC |
| Common Mode Voltage Range | +/-5 V |
| Analog Voltage Inputs | 6 |
| Passive Magnetic Speed Inputs | 4 |
| Speed Input Frequency Range | 2 to 20 Hz |
| Operating Temperature | 0 to 60 deg C |
| Dimensions | 11.00 x 9.00 x 3.00 |
| Country of Origin | United States |
| Reference Manual | GEH-64211 |
Turbine Speed Monitoring and Overspeed Protection
The IS200VTURH1BAB receives turbine speed signals from up to four passive magnetic pickups in a simplex configuration. These inputs provide speed information to the turbine controller, which uses the signals for speed monitoring and primary overspeed protection.
Furthermore, the interface supports a frequency range of 2 to 20 Hz. When used with passive pickups and a 60-tooth wheel, its input sensitivity allows the system to detect turning-gear speeds as low as 2 RPM. This capability also helps identify zero-speed conditions and supports automatic turning-gear engagement when configured in the turbine control system.
Generator Synchronization and Breaker Control
The VTUR interface receives generator and bus voltage signals for automatic synchronization. It works with the turbine controller and excitation system to coordinate synchronizing permissives and control the main generator breaker relay coil (52G).
Meanwhile, the synchronization function helps ensure that the generator meets the required conditions before breaker closure. The controller manages the associated relay logic to coordinate the breaker-closing sequence.
Trip Signal and Protection Interface
The VTUR participates in the turbine overspeed trip signal path. When the controller generates a trip command, the signal passes through the VTUR interface to the TRPG terminal board, which operates the emergency solenoids.
Overspeed trip signals can originate from either the VTUR or VPRO. The TRPG provides the relay interface for the protection circuit, with the described system using three primary overspeed trip relays.
Shaft Voltage and Current Monitoring
In addition to speed and synchronization signals, the system monitors induced shaft voltage and current to the machine casing. Brushes provide the shaft voltage measurement connection, allowing the control system to monitor electrical conditions associated with the rotating shaft.
These measurements provide additional operating information for turbine monitoring and protection.
Frequently Asked Questions
Q: How many passive magnetic speed pickups can the IS200VTURH1BAB support?
A: The described simplex configuration supports up to four passive magnetic speed inputs. These signals provide turbine speed information for monitoring and overspeed protection.
Q: Can the module detect very low turbine speeds?
A: Yes. With passive magnetic pickups operating on a 60-tooth wheel, the interface can detect speeds as low as 2 RPM. This supports turning-gear speed monitoring and zero-speed identification.
Q: Which manual covers the IS200VTURH1BAB?
A: The specified reference manual is GEH-64211. It is the relevant document to consult for detailed system operation and interface requirements.
