GE IS200EPCTG1AAA Exciter PT/CT Board

الوصف

The GE IS200EPCTG1AAA Exciter PT/CT Board (EPCT) is a crucial Input/Output Terminal Board in the GE EX2100 Excitation Control System, which is part of the Mark VI Speedtronic platform.

Its primary function is to provide isolation, conditioning, and termination for the critical generator voltage and current feedback signals before they are sent to the main controllers.

🔬 Core Function and Signal Processing

The EPCT board acts as the interface between the high-voltage/high-current signals from the main generator and the sensitive control electronics. It specifically handles the following measurements:

1. Potential Transformer (PT) Voltage Inputs:
   • It receives two 3-phase generator PT voltage inputs (typically nominal $\text{115 V}_\text{RMS}$ at $\text{50/60 Hz}$) from the customer’s potential transformers.
   • The board uses isolation transformers to step down and condition these high-voltage signals. This isolation is crucial for protecting the control circuitry from large electrical transients and noise.
2. Current Transformer (CT) Current Inputs:
   • It receives two generator CT current inputs (typically $\text{1 A}$ or $\text{5 A}$ nominal current) from the current transformers.
   • Isolation transformers are also used here to safely convert the current signals for measurement by the control system.
3. Analog Input:
   • The board also accepts one single non-isolated analog input, which can be configured for a $\text{0-10 V DC}$ voltage range or a $\text{4-20 mA}$ current range.

All conditioned signals from the EPCT are then routed via the backplane connectors (such as J305, J308, and J315) to the Exciter Main I/O (EMIO) board in the control rack for processing by the DSPX controllers.

📋 Key Specifications

The isolation and signal conditioning provided by the IS200EPCTG1AAA are essential for the precise and stable voltage regulation that the EX2100 system performs on the generator.