GE IS215VPROH2B Emergency Turbine Protection Board

GE IS215VPROH2B Emergency Turbine Protection Board

Functional Description

The IS215VPROH2B Turbine Protection Module (VPRO) and associated terminal boards (TPRO and TREG)

provide an independent emergency overspeed protection for turbines that do not have a mechanical

overspeed bolt. The protection module is separate from the turbine control and consists of triple redundant

VPRO boards, each with their own on-board power supply, VPRO controls the trip solenoids through relay

voting circuits on the TREG, TREL, and TRES boards.

The TPRO terminal board provides independent speed pickups to each VPRO, which processes them at high

speed. This high speed reduces the maximum time delay to calculate a trip and signal the ETR relay driver to

20 ms. In addition to calculating speed, VPRO calculates acceleration which is another input to the overspeed

logic. 

TPRO fans out generator and line voltage inputs to each VPRO where an independent generator

synchronization check is made. Until VPRO closes the K25A permissive relay on TTUR, generator

synchronization cannot occur. For gas turbine applications, inputs from temperature sensors are brought

into the module for exhaust over temperature protection. 

The VPRO boards do not communicate over the VME backplane. Failures on TREG are detected by VPRO and

fed back to the control system over the IONet. Each VPRO has an IONet communication port equivalent to

that of the VCMI.

Technical Specifications