IS200TRESH1B - Small Steam Turbine Emergency Trip Board

SPECIFICATIONS:

Part Number: IS200TRESH1B
Manufacturer: General Electric
Series: Mark VI
Number of Trip Solenoids: Three Solenoids per TRES
Trip Solenoid Rating: 125 V DC
Trip Solenoid Circuits: Circuits rated for NEMA
Solenoid Response Time: Solenoid L/R Time constant is 0.1 sec
Mounting: DIN-rail mounting
Technology: Surface mount
Operating temperature: 40 to 70°C
Size: 17.8 cm high x 33.02 cm
Repair: 3-7 days
Availability: In Stock
Country of Origin: United States
Manual: GEH-6421M

FUNCTIONAL DESCRIPTION:

IS200TRESH1B is a Small Steam Turbine Emergency Trip Board manufactured and designed by General Electric as part of the Mark VI Series used in GE Speedtronic Gas Turbine Control Systems. TRES is used for emergency overspeed protection for small/medium-sized steam turbines. TRES is controlled by the I/O controller and provides power to three emergency trip solenoids, which can be connected between the TRES and TRPS terminal boards. TRES provides the positive side of the 125 V DC to the solenoid, and TRPS provides the negative side. The I/O controller provides emergency overspeed protection, emergency stop functions, and controls the three relays on TRES, which control the three trip solenoids.

• TRES has both simplex and TMR forms.
• There are seven dry contact inputs for trip interlocks.
• TRES has no economizing relays.
• There are no emergency stop inputs.

In the TRES, the seven dry contact inputs, excitation, and signal are monitored and fed to the I/O controller. The board includes the synch check relay driver, K25A, and associated monitoring, the same as on TREG, and the servo clamp relay driver, K4CL, and its associated monitoring. A second TRES board cannot be driven from the I/O controller through J4.

INSTALLATION:

The three trip solenoids are wired to the first I/O terminal block. Up to seven trip interlocks are wired to the second terminal block. The wiring connections are shown in the following figure. Connector J2 carries three power buses from TRPS, and JH1 carries the excitation voltage for the seven-trip interlocks.

OPERATION:

The I/O controller controls TRES. In simplex systems, a third cable carries a trip signal from J1 to the TSVO terminal board, providing a servo valve clamp function upon turbine trip. Both TREL and TRES control the trip solenoids 1 and 2 so that either one can remove the power and actuate the hydraulics to close the steam or fuel valves. ETR3 is set up to supply power to trip solenoid #3. The nine trip relay coils on TRES are supplied with 28 V DC from the I/O controller. The trip solenoids are supplied with 125 V dc (or 24 V dc) through plug J2 and draw up to 1 A with a 0.1-second L/R time constant.

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FREQUENTLY ASKED QUESTIONS:

How do I know if a solenoid has tripped successfully during a test?

Each solenoid circuit includes a feedback contact wired back to the controller. This contact input provides a positive indication that the solenoid has tripped successfully, ensuring that the solenoid responded as expected during the test.

What is the purpose of offline overspeed trip tests?

Offline overspeed trip tests simulate overspeed conditions when the turbine is not running. These tests verify that the trip solenoids and control logic can correctly respond to an overspeed event, ensuring that the system is prepared for real-world emergencies.

How often should solenoid trip tests be performed?

The frequency of solenoid trip tests depends on the turbine's operational and maintenance schedule. Regular testing, including both online and offline tests, is recommended to ensure the continued reliability and safety of the emergency shutdown system.