IS200TRPAH2A is an Aeroderivative Turbine Primary Trip terminal board developed by GE. Do not inadvertently connect the 240 V ac and dc voltages in 240 V ac applications. The peak voltage will exceed the MOV rating, causing the device to fail. Most ac supplies have a grounded neutral, and if an inadvertent connection between the 125 V dc and the ac voltage is made, the sum of the ac peak voltage and the 125 V dc is applied to MOVs connected between dc and ground. In 120 V ac applications, however, the MOV rating can withstand the peak voltage without failing.
IS200TRPAH2A Features
As part of the Mark VIe control system, the board interface with PTUR / YTUR I/O packs and TTUR terminal boards. The following are the inputs and outputs:/p>
Twelve passive pulse rate devices (four per R/S/T section) measuring turbine speed by sensing a toothed wheel. Alternatively, six active pulse rate inputs (two per TMR section)
Two 125 V dc TMR voted output contacts for the trip coil to the main breaker coil.
Four 24-125 V dc voltage detection circuits for trip string monitoring
One 24-125 V dc 'Fail-safe' ESTOP input for disabling trip relays. Signals from TMR systems fan out to the PR3, PS3, PT3, JR4, JS4, and JT4 connectors.
Installation
TTL pulse rate pick-ups, voltage detection, E-Stop, and the breaker relay are all connected to I/O terminal block TB1.
TB2 is wired with passive pulse rate pick-ups. Each block is held together with two screws and has 24 terminals that accept wires up to #12 AWG.
To the left of each terminal block is a shield termination strip connected to chassis ground. JP1 and JP2 enable or disable fanning of the R section pulse rate pickups to the S and T PTURs or YTURs.
System Design
The TRPA board is intended for use in two different ways. When a TRPA terminal board is used to connect three PTUR or YTUR I/O packs to a TTUR terminal board, three cables with DC-37 pin connectors on each end can be used.
The TRPA provides two contact-voted trip relay outputs, ESTOP, and four voltage sensors in this mode of operation.
TTUR has the standard set of features described for that board. The TRPA speed inputs are inactive and should not be used with this board configuration.
The TRPA board can also be used with three I/O packs attached to it directly. The speed inputs to TRPA become active paths into the I/O pack in this mode of operation, allowing for a single terminal board primary trip solution.
Trip Relays
Trip relays are constructed from groups of six individual form A devices arranged in a voting pattern. A conduction path through the set will be established if two controllers vote to close. Because detecting a shorted relay is critical for maintaining tripping reliability, each set of relays has a sensing circuit installed.
When the relays are commanded to open and voltage is applied across the relays, the circuit detects whether one or more relays are shorted. This signal is sent to the I/O pack, which generates an alarm.
To avoid a false indication if one I/O pack votes to close the relay while the other two I/O packs vote to open, the TRPA sensing circuit uses relay commands from all three packs.
Configuration
Jumpers JP1 and JP2 control the fanning of the four passive speed pickups in the R section to the PTURs or YTURs in the S and T sections.
To fan the 4 R speed input to the other two TMR sections, place the jumper over the pin pairs.
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