IS200VPROH1BCD - Turbine Emergency Trip Board

SPECIFICATIONS:

Part No.: IS200VPROH1BCD
Manufacturer: General Electric
Series: Mark VI
Product Type: Turbine Emergency Trip Board
Number of inputs: 3
Number of Relay Outputs: Up to 12 relay outputs
Relay Contact Rating: 125 V DC / AC
Number of Channels: 24
Input Signal Voltage: 24 V DC
Weight Approx: 1.5 – 2.0 kg
Power Supply: 125 V DC
Availability: In Stock
Size: 17.8 cm wide x 33.02 cm
Typical Power Consumption: < 10 W
Operating Temperature Range: -20°C to +70°C
Country of Manufacture: United States (USA)
Manual: GEH-6421H

FUNCTIONAL DESCRIPTION:

IS200VPROH1BCD is a Turbine Emergency Trip Board manufactured and designed by General Electric and is part of the Mark VI Series used in GE Speedtronic Gas Turbine Control Systems. The Turbine Protection Board (VPRO) and its associated terminal boards (TPRO and TREG) form an independent emergency overspeed protection system. This system uses triple redundant VPRO boards housed separately from the turbine control system, and it controls the trip solenoids via the TREG board.

The VPRO board within the Protection Module (P) performs the emergency trip function. Up to three trip solenoids can be connected between the TREG and TRPG terminal boards, where TREG supplies the positive 125 V DC to the solenoids, and TRPG supplies the negative side. Either terminal board can initiate a turbine trip. The VPRO board handles both emergency overspeed protection and emergency stop functions. It controls 12 relays on the TREG board, with nine relays arranged into three groups of three to vote on inputs that govern the three trip solenoids. Additionally, a second TREG board can be operated by the VPRO via the J4 connector.

OPERATION:

The main purpose of the protection module is emergency overspeed (EOS) protection for the turbine, using three VPRO boards. In addition, VPRO has backup synchronization check protection, three analog current inputs, and nine thermocouple inputs, primarily intended for exhaust over-temperature protection on gas turbines. The protection module is always triple redundant with three completely separate and independent VPRO boards named R8, S8, and T8 (originally named X, Y, and Z). Any one of these boards can be powered down and replaced while the turbine is running without jeopardizing the protection system. Each board contains its own I/O interface, processor, power supply, and Ethernet® communications (IONet) to the controller. The communications allow initiation of test commands from the controller to the protection module and the monitoring of the EOS system diagnostics in the controller and on the operator interface. Communications are resident on the VPRO board, which is the heart of the system. The VPRO board has a VME interface to allow programming and testing in a VME rack; however, the backplane is neutralized when plugged into the protection module to eliminate any continuity between the three independent sections.

SPEED CONTROL AND OVERSPEED PROTECTION:

Speed control and overspeed protection are implemented with six passive, magnetic speed pickups. The first three are monitored by the controllers, which use the median signal for speed control and primary overspeed protection. The second three are separately connected to the R8, S8, and T8 VPROs in the protection module. Provision is made for nine passive magnetic speed pickups or active pulse rate transducers (TTL type) on the TPRO terminal board, with three being monitored by each of the R8, S8, and T8 VPROs. Separate overspeed trip settings are programmed into the application software for the primary and emergency overspeed trip limits, and a second emergency overspeed trip limit must be programmed into the I/O configurator to confirm the EOS trip point.

BACKUP SYNCH CHECK PROTECTION:

Backup sync check protection is provided in the Protection Module. The generator and bus voltages are supplied from two single-phase, potential transformers (PTs) secondary outputs supplying a nominal 115 V rms. The maximum cable length between the PTs and the turbine control is 100 meters of 18 AWG twisted, shielded wire. Each PT is magnetically isolated with a 1,500 V rms rated barrier and a circuit load less than 3 VA. The sync algorithms are based on phase lock loop techniques. Phase error between the generator and bus voltages is less than +/-1 degree at nominal voltage and 50/60 Hz. A frequency range of 45 to 66 Hz is supported, with the measured frequency within 0.05% of the input frequency. The algorithm is illustrated under TTUR, generator synchronizing.

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FREQUENTLY ASKED QUESTIONS:

How does the Emergency Trip Board activate the turbine trip solenoids?

The board controls trip solenoids by supplying 125 V DC through terminal boards (such as TREG and TRPG). It energizes the solenoids via a positive supply on TREG and a negative return on TRPG, allowing either terminal board to trigger a trip.

What are the input and output voltages supported by the Emergency Trip Board?

The Emergency Trip Board typically operates with a 125 V DC supply for trip solenoids. Input signals may range from 24 V DC to 125 V DC, depending on system design, and relay outputs are usually rated for 125 V DC or AC.

What type of relay contacts are used for trip outputs, and what is their electrical rating?

Typically, silver alloy or gold-plated form-C relay contacts rated for 125 V DC / AC and current ratings from 5 A to 10 A, suitable for solenoid coil loads, are used.