IS215VPROH1BH - Turbine Protection Board

SPECIFICATIONS:

Part Number: IS215VPROH1BH
Manufacturer: General Electric
Series: Mark VI
Product Type: Turbine Protection Board
Number of Inputs: 4 - 20 mA
Number of Outputs: 6
Power Supply Voltage: 125 V dc
Thermocouple types: E, J, K, S, T
Span: -8 mV to +45 mV
Common Mode Voltage Range: ±5 V
Dimensions: 16.51 cm High x 17.8 cm
Operating temperature: 30 to 60 °C
No.of Analog Voltage Inputs: 6
Repair: 3-7 Day
Availability: In Stock
Country of Origin: United States
Manual: GEH-6721H

FUNCTIONAL DESCRIPTION:

IS215VPROH1BH is a Power Distribution System Feedback I/O Module manufactured and designed by General Electric as part of the VI Series used in GE Speedtronic Control Systems. The Turbine Protection Board (VPRO) and associated terminal boards (TPRO and TREG) provide an independent emergency overspeed protection system. The protection system consists of triple redundant VPRO boards in a module separate from the turbine control system, controlling the trip solenoids through TREG. The VPRO board in the Protection Module

provides the emergency trip function. Up to three trip solenoids can be connected between the TREG and TRPG terminal boards. TREG provides the positive side of the 125 V dc to the solenoids and TRPG provides the negative side. Either board can trip the turbine. VPRO provides emergency overspeed protection and emergency stop functions. It controls the 12 relays on TREG, nine of which form three groups of three to vote inputs controlling the three trip solenoids. A second TREG board may be driven from VPRO through J4.

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 controller. The communications allow the initiation of test commands from the controller to the protection module and the monitoring of 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.

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FREQUENTLY ASKED QUESTIONS:

How many protection boards are typically used in the system?

The protection system generally uses three redundant boards to ensure continuous protection. Each board operates independently to provide backup and reliability.

What types of inputs and outputs does this board support?

The board supports 4 - 20 mA inputs, has 6 analog voltage inputs, and provides 6 outputs. It also accommodates various thermocouple types including E, J, K, S, and T.

How is the board integrated into the turbine protection system?

The board is part of a module that includes terminal boards for controlling trip solenoids. The system is designed to be redundant, with multiple boards providing emergency trip functions and feedback.