GE IS200ERSCG2AAA (ERSC) EX2100 Excitation Regulator Static Converter Card

GE IS200ERSCG2AAA = IS200ERSCG2A, where AAA denotes the version suffix. It is a core power interface board for the GE Vernova EX2100 / EX2100e digital excitation control system, paired with Mark VI / Mark VIe turbine control systems.

Basic Information

EX2100 is GE third-generation digital static excitation system, designed for gas turbines, steam turbines and hydroelectric generators. It supports both new unit installations and legacy excitation retrofits, and can operate in simplex mode or triple modular redundant M1/M2/C architecture.IS200ERSCG2AAA (ERSC, Exciter Regulator Static Converter) is the regulator power execution board. Mounted inside the ERBP/ERRB rack, it works in conjunction with ERIO, ERDD and ERRR boards. It receives excitation control commands from the controller and directly performs excitation PWM power conversion as well as generator rotor field de-excitation discharge control.

Core Functions

PWM DC Excitation Current Generation

Equipped with 6-channel IGBT power devices, the board converts digital control commands from the main control board into high-frequency PWM DC output to precisely regulate the excitation winding current of the generator. As the power execution component for AVR automatic voltage regulation, it directly determines the regulation accuracy of terminal voltage and reactive power.

Rotor Field Discharge / De-excitation

During unit tripping or fault conditions, ERSC drives IGBTs to implement generator rotor de-excitation. It releases the stored energy from the excitation winding to external discharge resistors to suppress rotor overvoltage and protect the excitation bridge and generator rotor insulation. In redundant systems, it also controls the K3 charging bypass relay to realize soft charging of DC bus capacitors.

High-Speed Backplane Bus Communication

Via the EX2100 backplane ISBus, it exchanges status and fault diagnostic signals in real time with the ERIO analog IO board, ERDD IGBT drive & dynamic discharge board and ERRR redundant relay board. It supports both simplex and hot standby redundant configurations.

On-Board Self-Diagnostics

It continuously monitors IGBT status, on-board power supply and pulse timing. Fault signals are uploaded to the EX2100 controller. Alarms can be viewed via ToolboxST software for online fault localization.

Supplementary Note: The Snubber board (IS200ERSNG1A) is the RC absorption board used to absorb switching spikes and suppress overvoltage of power devices. ERSC (IS200ERSCG2AAA) is the main power conversion card. Many suppliers confuse these two components.

Hardware Specifications

Model: IS200ERSCG2AAA (base model IS200ERSCG2A) Manufacturer: GE (now GE Vernova), made in USA Series: EX2100 / EX2100e Excitation Control System Core Components: 6 IGBT power transistors Operating Mode: Simplex / M1/M2/C Triple Modular Redundancy Associated Boards: ERIO, ERDD, ERRR, ERBP rack backplane Power Supply: 24V DC backplane power supply Operating Temperature: Industrial wide temperature range -40℃ ~ +70℃, with conformal coating to adapt to high-dust and vibration-prone environments in power plants Communication: Backplane ISBus; upper-layer system supports Modbus TCP/IP for connection with DCS and HMI Applicable Units: Gas turbines, thermal steam turbine generators, hydroelectric generators, including excitation applications for nuclear power units

Application Scenarios

• EX2100 static excitation cabinets for generators in large power plants
• Combined cycle power plants with gas turbines (LM2500, LM6000 and other units)
• Legacy excitation system retrofit projects (replacement of old analog excitation systems)
• Grid-connected generator sets requiring redundancy and high reliability

Distinction of Easily Confused Models