IS420ESWBH2A
General Electric (GE) IS420ESWBH2A Excitation System Control Module
Product Description
The IS420ESWBH2A is a high-performance excitation system control module developed by GE, specifically designed for regulating the excitation of synchronous generators in power generation facilities. As a key component of GE’s Mark VIe control system, it manages the field current of the generator’s rotor, controlling the output voltage and reactive power to ensure stable operation of the generator and the connected power grid. This module is widely applied in thermal power plants, hydroelectric stations, and combined-cycle power plants, where precise excitation control is critical for maintaining grid stability, improving power quality, and protecting the generator from electrical faults.
In a thermal power plant, the IS420ESWBH2A module continuously monitors the generator’s terminal voltage, stator current, and grid frequency. It adjusts the excitation current supplied to the rotor winding—modulating the magnetic field strength—to maintain the terminal voltage at the setpoint, even as the generator’s load fluctuates. During grid disturbances (e.g., voltage sags or sudden load changes), it rapidly increases or decreases the excitation current to stabilize the generator’s output, preventing voltage collapse and ensuring uninterrupted power supply. The module also implements protective functions such as overexcitation limiting, underexcitation limiting, and field overvoltage protection, safeguarding the generator and excitation system from damage.