GE IS215VPROH2B Turbine Protection Board

GE IS215VPROH2B Turbine Protection Board

Part Number IS215VPROH2B Manufacturer General Electric Country of Manufacture As Per GE Manufacturing Policy Series Mark VI Function Module Availability In StockThe IS215VPROH2B is an Emergency Turbine Protection Board developed by GE. An independent emergency Overspeed protection system is provided by the Emergency Turbine Protection (VPRO) board and accompanying terminal boards (TPRO and TREG). The protection system consists of three redundant VPRO boards in a separate module from the turbine control system, which uses TREG to regulate the trip solenoids. 

 For IONet communications with the control modules, VPRO also features an Ethernet connection. The emergency trip function is provided by the VPRO board in the Protection Module P. Between the TREG and TRPG terminal boards, up to three trip solenoids can be connected. TREG supplies the solenoids with the positive side of the 125 V dc, while TRPG supplies the negative side. The turbine can be tripped by either board. The emergency Overspeed protection and emergency stop functions are provided by VPRO. It manages TREG's 12 relays, nine of which are organized into three groups of three to operate the three trip solenoids by vote inputs. IS215VPROH2B Installation To install the V-type board, follow these instructions. 

 Turn the VME I/O processor rack off. To seat the board's edge connectors, slide it in and push the top and bottom levers in with your hands. Tighten the captive screws on the front panel's top and bottom. Turn on the VME rack and look at the diagnostic lights on the front panel. IS215VPROH2B Operation The major objective of the protection module, which employs three VPRO boards, is to provide emergency Overspeed (EOS) protection for the turbine. VPRO also includes backup synchronization check protection, three analog current inputs, and nine thermocouple inputs, which are primarily used for gas turbine exhaust over-temperature protection. Overspeed protection and speed control Six passive, magnetic speed pickups are used for speed control and Overspeed protection. The controllers keep an eye on the first three, using the median signal for speed control and primary Overspeed protection. The R8, S8, and T8 VPROs in the protection module are wired individually to the second three. 

 Detection of Speed Differences There should never be a reason for PPRO's calculated speed to diverge significantly from the primary control's predicted speed. The magnitude difference between pulse rate 1 from both PPRO and the main control is used to detect speed differences. Analog and Thermocouple Inputs The VPRO has thermocouple and analog inputs, which are usually used in gas turbine applications. There are nine thermocouple inputs monitored, three of which are connected to each VPRO. Power Supply Each VPRO board comes with its own power source. 

Using 125 V dc from the cabinet PDM, this creates 5 V dc and 28 V dc. As a result, the complete protection module has three power supplies for maximum reliability. Diagnostics The state of the VPRO front panel is indicated by three LEDs at the top. The RUN state is a flashing green, whereas the FAIL condition is a solid red. The third LED, STATUS, is ordinarily off but displays a constant orange if the board has a diagnostic alert condition.

SPECIFICATIONS:

Part No: IS215VPROH2B
Manufacturer: General Electric
Function: Turbine Protection Board
Series: Mark VI
Number of Inputs: 3
Number of Outputs: 6
Operating temperature: -30 to 65 ºC
Power Supply Voltage: 125 V dc
Technology: Surface Mount
Board Size: 33.0 cm high x 17.8 cm
Availability: In Stock
Country of Origin: USA
Manual: GEH-6421H

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.

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.