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The GE DS2020FFMCG1 is an Exciter Field Flashing Panel used in GE’s Mark V Speedtronic and EX2000 series control systems. Its designation, “350A,” highlights its high-current capacity, which is a key aspect of its function.
1. Function and Purpose
The primary purpose of the DS2020FFMCG1 is to perform “field flashing,” a critical procedure required when a generator loses its residual magnetism. This can happen if a generator has been out of service for a long period or due to a short circuit or other electrical fault.
A generator requires a small amount of residual magnetism in its rotor to “bootstrap” itself and begin producing voltage. Without it, even if the turbine is spinning at the correct speed, the generator will not build up voltage. The field flashing panel addresses this by injecting a brief, high-current DC pulse into the exciter field coils. This controlled surge, or “flash,” restores the necessary residual magnetism, allowing the generator to begin the voltage buildup process and resume normal operation.
The “350A” rating is significant as it indicates that this panel is capable of providing a substantial current, making it suitable for larger generators that require a powerful initial current to restore their magnetic field.
2. Design and Technical Features
The DS2020FFMCG1 is not a single circuit board but a complete panel assembly. It is a robust, self-contained unit designed to handle high-current loads safely. The panel contains the necessary components—such as relays, switches, fuses, and a control circuit—to manage the field flashing process. It is typically mounted within a larger control cabinet, where it can be manually or automatically activated.
The “DS2020” designation signifies that it is a specialized assembly, similar to other dedicated modules in the Mark V series. The G1 revision indicates it is the first generation of this particular assembly, although a successor model, the DS2020FFMCG2, also exists. The G2 model is also rated at 350A and has a similar function, but with potential design or component updates.
3. Applications and Importance
The field flashing panel is a crucial safety and maintenance component in power generation facilities. It provides a means to “black start” a generator (start it without relying on external power from the grid) or recover a unit that has failed to build voltage. In a power plant, the reliability of a generator is paramount, and the ability to quickly and safely restore its functionality is vital. This panel provides that capability, ensuring operational readiness and minimizing downtime.
