Product Details
Up to three trip solenoids can be connected between the TREx and TRPx (TRPG, or TRPL, or TRPS) terminal boards. TREx provides the positive side of the 125 V dc to the solenoids and TRPx provides the negative side. Either board can trip the turbine. IS215VPRO provides emergency overspeed protection and the 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 IS215VPRO through J4.
Product Installation：
The generator and bus potential transformers, analog inputs, and thermocouples are wired to the first terminal block on TPRO. The magnetic speed pickups are wired to the second block. Jumpers JP1A and JP1B are set to give either a 4-20 mA or voltage input on the first of the three analog inputs.
The wiring connections are shown in the following figure. Two cables connect to each of the three IS215VPRO boards.
Product Operation：
The main purpose of the TPRO is to supply speed signals to IS215VPRO for the emergency overspeed (EOS) protection for the turbine. In addition, TPRO supplies generator signals for backup synchronization check protection, three analog current inputs, and nine thermocouple inputs, primarily for exhaust over-temperature protection on gas turbines. IS215VPRO provides 28 V dc to TPRO to power the three analog input transmitters.
Backup Synch Check Protection：
TPRO provides inputs to the protection module for backup synchronization check. The generator and bus voltages are supplied from two, single phase, PTs secondary output supplying a nominal 115 V rms. The maximum cable length between the PTs and the turbine control is 100 m (328 ft) of 18 AWG twisted, shielded wire. Each PT is magnetically isolated with a 1,500 V rms rated barrier and a circuit load less than 3 VA.
Each PT input is internally connected in parallel through TPRO to the three IS215VPROs in the protection module. The triple redundant phase slip windows result in a voted logical output on the TREG terminal board, which drives the K25A relay. This relay’s contacts are connected in series with the synch permissive relay (K25P) and the auto synch relay (K25) to insure that no false command is issued to close the generator breaker. Similarly, contacts from the K25A contact are connected in series with the contacts from remote, manual synchronizing equipment to insure no false commands.
Thermocouple and Analog Inputs
TPRO provides thermocouple and analog inputs to the protection module, primarily for gas turbine applications. Nine thermocouple inputs are monitored with three connected to each IS215VPRO. These are generally used for backup exhaust over-temperature protection. Also, one ±5, 10 V dc, 4-20 mA input, and two 4-20 mA inputs can be connected to the TPRO terminal board, which feeds the inputs in parallel to the three IS215VPROs.
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