151X1207CK02SA01 GE EX2100 Excitation De-Excitation SCR Assembly

Product Description
151X1207CK02SA01 is GE Vernova EX2100 excitation system SCR de-excitation thyristor assembly, matched with IS200EDEXG series de-excitation control board. This assembly is the high-power power unit for generator field crowbar protection. When the generator trips, it quickly turns on the SCR bank to consume the magnetic energy stored in the rotor field winding, suppress dangerous rotor overvoltage and protect excitation transformers, rectifier bridges and generator rotor insulation. It is a critical power assembly inside the EX2100 / EX2100e excitation cabinet for Mark VI turbine control system.

Key Features

• High-power SCR thyristor stack assembly, high voltage and high current rated design for generator field de-excitation crowbar circuit
• Works cooperatively with IS200EDEXG control board; receives firing pulse to trigger SCR conduction during trip events
• Integrated snubber circuit, voltage divider and temperature monitoring components for thyristor protection
• High vibration and thermal cycling resistance, designed for power plant excitation cabinet continuous operation
• Built-in temperature monitoring for overheat alarm and fault diagnosis
• Modular cabinet mounting assembly, complete assembly with heat sink and power terminals
• Legacy GE power generation spare; original production discontinued, available as NOS surplus or refurbished units

Application Scenarios

• GE Mark VI Speedtronic gas / steam turbine EX2100 excitation control cabinet
• Combined cycle power plant, thermal power plant generator excitation system
• Cogeneration unit, industrial captive power plant rotor de-excitation protection
• Power plant excitation system overhaul, spare replacement and retrofit projects

FAQ

Q: What control board matches 151X1207CK02SA01?
A: It pairs with IS200EDEXG1BBB de-excitation control board, which sends firing signals to trigger this SCR assembly.

Q: What is the core function of this assembly?
A: Generator rotor field crowbar de-excitation, releasing stored magnetic energy during emergency trip to prevent rotor overvoltage damage.

Q: Can it be replaced live online?
A: No. The excitation system must be fully de-energized, isolated and discharged before maintenance work.