IS200TGNAH1A - Turbine-Generator Terminal Board

SPECIFICATIONS:

Part Number: IS200TGNAH1A
Manufacturer: General Electric
Series: Mark VIe
Inputs to TGNA: 3
Product Type: Turbine-Generator Terminal Board
Generator current inputs: 0 to 5 A
Analog inputs Current inputs: 4-20 mA
Analog output current: 0-20 mA
Size: 15.9 cm high x 17.8 cm wide
Frequency: 50 or 60 Hz
Repair: 3-7 Day
Availability: In Stock
Weight: 2 lbs
Country of Origin: United States
Manual: GEH-6721G

FUNCTIONAL DESCRIPTION:

IS200TGNAH1A is a Turbine-Generator Terminal Board Manufactured and designed by General Electric as part of the Mark VIe Series used in GE Distributed Turbine Control Systems. The Turbine-Generator terminal board (TGNA) acts as a signal interface board for the Mark VIe I/O pack PGEN. In the Mark VI system, the VGEN board works with TGEN. The TGNA provides a direct interface to three analog inputs for sensing turbine steam pressure and three current transformer (CT) feedbacks for sensing generator current. The three analog inputs are configurable to be 4-20 mA, +/- 5 V, or +/-10 V inputs. There are two jumpers for each analog input. One jumper is used to select either current (4-20 mA) or voltage feedback. The other jumper can optionally ground the return path for the inputs. The three CT inputs can be fed from 1 A or 5 A-rated CT outputs. A separate terminal board point is provided for the two different amp-rated inputs. Configuration parameter CT_Secondary designates which terminal board points are used. The signals are passed on to the Mark VIe I/O packs through a 37-pin connector. The TGNA can be used for either simplex or TMR applications. TMR applications fan the signal to three I/O packs.

INSTALLATION:

Voltage-output sensors should use VDCx and Retx as signal connection points. Jumper JP1(3,5) should be in the voltage I/P position. JP2(4,6) should be in the differential input position for differential feedback and in the Return to GND position for sensors supplied with the 24 V output. Configuration parameter InputUse for the analog inputs should be set according to the type of sensor being used, +/-10 V, +/-5 V, or 4-20 mA. Current-based sensors should use IDCx and Retx as signal connection points. Jumper JP1(3,5) should be in the 4-20 mA I/P position. JP2(4,6) should be in differential input position.

OPERATION:

PGEN monitors the generator's 3-phase current and turbine mechanical power to provide the PLU over-speed control for large steam turbines. Three single-phase CT inputs are provided with a normal current range of 0 to 5 A continuous or 0 to 1 A continuous. The CTs are magnetically isolated on TGNA. CTs connect to non-pluggable terminal blocks with captive lugs accepting up to #10 AWG wires. The total generator current is calculated from these inputs. The three analog inputs accept 4-20 mA inputs or ±5, ±10 V dc inputs. A +24 V dc source is available for all three circuits with individual current limits for each circuit. The 4-20 mA transducers can use the +24 V DC source from the turbine control or a self-powered source. A jumper on TGNA selects between current and voltage inputs for each circuit. In a TMR system, analog inputs fan out to the three I/O packs (PGEN). The 24 V dc power to the transducers comes from all three PGEN packs and is diode-shared on the TGNA.

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FREQUENTLY ASKED QUESTIONS:

What types of connections are typically found on a Terminal Board?

Terminal Boards often include connections for stator leads, neutral points, grounding, and sometimes instrument transformers. The specific configuration depends on the design of the generator and the power system requirements.

How is the Terminal Board protected from environmental factors?

Terminal Boards are typically housed in protective enclosures or cabinets to shield them from environmental elements like moisture, dust, and temperature variations. This helps ensure the reliability and longevity of the electrical connections.

What are some common issues with Terminal Boards?

Issues may include loose connections, insulation breakdown, or corrosion. Regular inspections and preventive maintenance are crucial to identify and address these issues promptly.