IS200EGPAG1BEC - Exciter Gate Pulse Amplifier Board

SPECIFICATIONS:

Part Number: IS200EGPAG1BEC
Manufacturer: General Electric
Series: EX2100
Product Type: Exciter Gate Pulse Amplifier Board
Operating System: QNX
Power Requirements: +5 V dc, 6 A
Number of input channels: 24
Trip Solenoid Rating: 125 V dc
Power supply voltage: 28 V dc
Operating temperature: 40 to 70�C
Size: 168 x 150 x 55 mm
Repair: 3-7 Day
Availability: In Stock
Country of Origin: United States
Manual: GEI-100461A

FUNCTIONAL DESCRIPTION:

IS200EGPAG1BEC is an Exciter Gate Pulse Amplifier Board manufactured and designed by General Electric as part of the EX2100 Series used in GE Excitation Turbine Control Systems. The Gate Pulse Amplifier Board (EGPA) operates within the EX2100 Excitation Control system, where it processes gate commands from the ESEL and manages the gate firing for up to six Silicon Controlled Rectifiers (SCRs) in the Power Bridge. It also serves as the interface for monitoring current flow, as well as airflow and temperature within the bridge. The EGPA includes an on-board dc/dc converter, powered by a nominal 125 V dc input from the EPDM, enabling SCR gating across the full range of input voltage. LED indicators provide visual feedback on the EGPA�s power status, input gate signals from the ESEL, outputs to the SCRs, current levels in the bridge, filter status, cooling fan activity, bridge temperature, and any alarms or faults.

GATE COMMAND INPUTS:

The EGPA receives six gate commands from the ESEL through a shielded, twisted-pair, multiconductor cable. These differential gate commands are optically coupled, filtered, AC-coupled, and directed to the Gate Pulse Amplifier (GPA). Each of the six SCRs has a dedicated GPA, with the EGPA providing galvanic isolation between each SCR gate.

SENSOR INPUTS:

• Conduction currents are monitored on each of the three phases at the bridge input, with the EGPA functioning as an interface between the Hall Effect sensors on the EXCS boards and the system controller. The EGPA supplies power to the EXCS and receives status signals from it, indicating the current flow through each phase of the three-phase bridge input. These signals are received by the EGPA at connectors J9 and J10, where they are conditioned and then relayed to the controller to report bridge status.

• Bridge temperature is monitored via an RTD (thermistor) sensor input or a temperature switch input. In newer exciters, only the RTD input is active, with jumpers on the EGPA disabling the temperature switch inputs. However, in retrofitted bridges with EX2100 control, the two temperature switch inputs are utilized to connect with the pre-existing temperature switches on the bridge, leaving the RTD input open and inactive. Both the RTD and temperature switch inputs connect to the EGPA at J13.

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FREQUENTLY ASKED QUESTIONS:

How does the EGPA receive gate commands?

The EGPA receives six gate commands from the ESEL via a shielded, twisted-pair, multiconductor cable. These commands are optically coupled, filtered, and sent to the Gate Pulse Amplifiers (GPAs) for each SCR.

How is bridge temperature monitored by the EGPA?

Bridge temperature can be monitored using an RTD (thermistor) sensor input or a temperature switch input. Newer exciters rely on the RTD input exclusively, while retrofitted systems with EX2100 control use the temperature switch inputs to interface with existing temperature switches. Both inputs connect to the EGPA at J13.

How does the EGPA indicate operational status?

LED indicators on the EGPA provide visual feedback on power status, gate commands from the ESEL, outputs to SCRs, current in the bridge, cooling fan operation, bridge temperature, and any alarms or fault conditions.