GE IS220PPROH1A Backup Turbine Protection Module
Description:
IS220PPROH1A is part of Ge Mark Vie series module. It is a backup turbine protection I/O pack which can be used in hazardous locations. The Emergency Turbine Protection (PPRO) pack, and associated terminal boardsprovide an independent backup overspeed protection system with a backup check forgenerator Syncronization to a utility bus. They also provide an independent watchdogfunction for the primary control. A typical protection system consists of three triplemodular redundant (TMR) PPRO I/O packs mounted to a separate simplex protectioiSPRO) terminal board. A cable, with DC-37 pin connectors on each end, connectseach SPRO to the designated emergency trip board:
TREG: Gas Turbine Emergency Trip Terminal Board
TREL: Large Steam Turbine Emergency Trip Terminal Board
TRES: Small/Medium Steam Turbine Emergency Trip Terminal Board
TREA: Turbine Emergency Trip Terminal Board
An alternate arrangement puts three PPRO I/O packs directly on TREA for a single board TMR protection system.
Mark* Vle is designed with a primary and backup trip system that interacts at thetrip terminal board level. Primary protection is provided with the Turbine PrimaryI/O pack, PTUR, operating a primary trip board (TRPG,TRPL,TRPS,TRPA)Backup protection is provided with the PPRO I/O pack operating a backup trip board(TREG.TRELTRES.TREA)
PPRO accepts three speed signals, including basic overspeed, acceleration.deceleration and a hardware implemented overspeed. The pack monitors theoperation of the primmary control and can monitor the primary speed as a sign ofnormal operation PPRO onitors the status and operation of the selected trip boardthrough a comprehensive set of feedback signals. If a problem is detected, PPRO willtrip the backup trip relays on the trip board and activate a trip on the primary control.The pack is fully independent of and unaffected by the primary control operation.
A maximum of three trip solenoids can be connected between the primary andemergency trip terminal boards. Connecting a solenoid between the boards isolatesthe power on both sides of the solenoid as well as visibility of solenoid voltage as asystem feedback. The primary/emergency trip boards TRPG/TREG,TRPL/TRELand TRPS/TRES are designed to operate as a pair and use cabling between theboards for system connections. TRPA and TREA are designed with no pairingrequired and can be used independently of each other. When TRPA and TREA arepaired, they function the same as other board pairs.