GE Electric | IS420ESWBH3A | Excitation System Terminal Board

GE IS420ESWBH3A Excitation System Terminal Board

The IS420ESWBH3A is a specialized Terminal Board designed for GE’s Mark VIe family of turbine control systems. Its primary function is to provide the critical interface between the Mark VIe controller and the generator’s excitation system, handling analog/digital I/O signals for excitation control, protection, and monitoring. It features enhanced isolation and safety ratings for high-voltage environments.

Product Parameters & Specifications:

Key Features:

1. High-Voltage Isolation: Provides critical isolation between low-voltage control systems and high-voltage excitation circuits.
2. Excitation-Specific I/O: Terminals designed for connecting generator field voltage/current signals, gate pulses, status signals, and control commands.
3. SIL Compliance: Engineered to support Safety Instrumented Functions (SIL) for generator protection systems.
4. Robust Construction: Industrial-grade components and terminal blocks for reliable operation in power generation environments.
5. Seamless Integration: Direct plug-in compatibility with Mark VIe controller racks and associated I/O packs.
6. Diagnostic Support: Facilitates signal monitoring and diagnostics through the Mark VIe platform.
7. Standardized Wiring: Clearly labeled terminal blocks simplify field wiring and maintenance.
8. Designed for Critical Systems: Central component in ensuring reliable generator excitation and protection.

Primary Function (Role): The core function of the IS420ESWBH3A is to serve as the physical and electrical interface connecting the Mark VIe turbine controller’s logic and I/O modules to the generator’s excitation system components (e.g., voltage regulators, field breakers, thyristor bridges, field voltage/current transducers). It routes critical control, feedback, and protection signals while providing essential electrical isolation.

Primary Purpose (Use): The IS420ESWBH3A is used to enable precise control and protection of the generator’s excitation system by the Mark VIe controller. It ensures signals are correctly conditioned, isolated, and transmitted between the sensitive control electronics and the high-power excitation circuits.

Typical Applications & Use Cases:

• Connecting Mark VIe controllers to GE EX2100e excitation controllers.
• Interfacing generator field voltage (Vfd) and field current (Ifd) feedback signals.
• Connecting gate pulse outputs from the controller to excitation power bridges (thyristors/SCRs).
• Interfacing field breaker status and control signals (Open/Close commands, status feedback).
• Connecting signals for automatic voltage regulator (AVR) functions and limiters.
• Providing interfaces for excitation system protection functions (Over-excitation, Under-excitation, Loss-of-Field).
• Integrating manual excitation control station signals.

Primary Application Fields:

1. Power Generation: Core component in gas turbine (GT), steam turbine (ST), and combined cycle power plant (CCPP) control systems.
2. Generator Excitation Control: Dedicated interface for managing the DC field current of synchronous generators.
3. Generator Protection Systems: Facilitates critical signals used in generator protection relays and logic within the Mark VIe.
4. Industrial Power Plants: Used in captive power plants for large industries (e.g., oil & gas, chemicals, metals).
5. Marine Propulsion: Potential use in marine turbine-generator control systems.
6. Critical Infrastructure: Power generation facilities requiring high reliability and safety certification (SIL).