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The GE part number IS200ERDDH1A is a Dynamics Discharge Card for the EX2100 Excitation Control System. Its primary function is to safely dissipate the energy stored in the generator’s field windings and the excitation system’s power electronics during a shutdown. It’s designed to perform this function quickly and safely in both normal and emergency situations. ⚡
Function and Key Features
When a generator is running, the magnetic field in its rotor is maintained by a powerful DC current from the exciter. When the generator is shut down, this current needs to be removed quickly to prevent a dangerous overvoltage as the magnetic field collapses. The ERDD board handles this critical process.
- Energy Dissipation: The board contains the circuitry to redirect the stored magnetic energy from the field windings into a discharge resistor, safely and quickly dissipating it as heat. This prevents a large, potentially damaging voltage spike (back EMF) and protects the equipment.
- Redundancy and Reliability: The ERDD board is designed with redundant features and is a crucial part of the system’s emergency trip circuit, ensuring that the generator can be safely de-energized in the event of a fault.
- System Integration: The ERDD card works in conjunction with the main control card (like a DSPX) and other I/O boards. It receives commands to initiate the de-excitation sequence and sends back status information.
- Robust Design: Like all GE industrial control components, it is built to withstand the harsh conditions of a power plant.
Applications
The IS200ERDDH1A is an essential safety and control component in power generation facilities that operate the EX2100 system. It is used for:
- Generator Protection: It prevents damage to the generator’s field windings and the excitation system by safely managing the high-energy discharge during shutdowns.
- Emergency Shutdowns: It is a critical part of the system’s emergency trip circuit, ensuring that the generator can be safely de-energized in the event of a fault.
