Product Overview

The IS200EPCTG1A serves as a vital Exciter PT/CT (EPCT) terminal board within the General Electric EX2100 Excitation Control System. This high-performance component functions as the primary interface for receiving and conditioning critical generator feedback. By integrating isolation transformers, the board ensures that the control system receives accurate data from potential transformers (PT) and current transformers (CT) without risking electrical interference.

Whether you operate a simplex or redundant control configuration, the IS200EPCTG1A provides the reliability necessary for industrial power generation. It acts as a signal conditioner, scaling and isolating raw inputs before transmitting them to the EMIO board in the control rack.

Technical Specifications

Key Functional Features

Precise Generator Measurement

The IS200EPCTG1A manages two three-phase generator PT voltage inputs. It uses two isolation transformers to create a three-wire open delta voltage measurement. This process produces a scaled 1.533 V rms output from a standard 115 V rms input. For current monitoring, the board accepts two generator CT inputs with levels of either 1 A or 5 A. These measurements allow the EX2100 system to maintain perfect synchronization and regulation of the generator output.

Advanced Signal Conditioning

Six onboard isolation transformers (designated T1 through T6) provide the core functionality of this board. These components isolate the high-energy generator environment from the sensitive electronic control rack. The board scales the signals to a level compatible with the EMIO board, ensuring the control logic operates on clean, accurate data.

Versatile Analog Integration

Beyond PT and CT inputs, the EPCT board accepts one non-isolated analog input. Users can configure this input via jumper JP1 to accept either a 0-10 V dc voltage signal or a 4-20 mA current loop. This flexibility allows operators to integrate auxiliary sensors or external control signals directly into the excitation lineup.

Installation and Safety Design

GE designed the IS200EPCTG1A with industrial durability in mind. The hardware layout includes:

• Terminal Blocks: The board features three terminal blocks. While TB1 is removable for easy wiring, TB2 and TB3 remain fixed. This permanent attachment prevents accidental CT open-circuit conditions, which could otherwise cause dangerous high-voltage spikes.
• Wiring Capacity: The board supports heavy-duty wiring. CT connections accommodate up to #10 AWG wire, while PT inputs utilize #12 AWG wire. This ensures low resistance even over cable runs reaching 1000 feet.
• Diagnostics: Eight voltage test points (TP1–TP8) allow technicians to verify the secondary side of each isolation transformer quickly. This feature significantly reduces troubleshooting time during routine maintenance.

Why Choose the IS200EPCTG1A?

In the demanding environment of a power plant, signal integrity is non-negotiable. The IS200EPCTG1A offers a robust solution for the EX2100 series, combining isolation, scaling, and feedback in a compact form factor. Its ability to operate in extreme temperatures (-30 to 65 ºC) ensures consistent performance regardless of the climate. By choosing genuine GE parts, you maintain the safety certifications and operational efficiency of your excitation control system.