Description
1. Product Overview
IS200EAUXH1A is a TMR auxiliary‑function I/O interface board developed by General Electric (GE, USA) for the EX2100 / EX2100E generator excitation‑control system. As one of the core supporting modules of the GE Mark VI gas‑turbine and steam‑turbine control series, it acts as a critical unit for signal acquisition, conversion, transmission and auxiliary‑function expansion within the excitation system.
This board is mainly responsible for AC‑signal sampling, conversion into standard analog signals and expansion of auxiliary‑logic interfaces for the excitation system. It accurately collects AC operating signals from the excitation loop and converts them into industrial‑standard voltage and current signals for calculation and analysis by the main‑control system. Manufactured with conformal‑coated PCB technology, a wide‑band signal‑processing architecture and high‑voltage isolation protection, it delivers wide frequency response, high linearity, stable signal accuracy, strong anti‑interference performance and excellent fault tolerance. Optimized for harsh power‑plant conditions including high ambient temperature, intensive electromagnetic interference and 24‑hour non‑stop operation, it is natively compatible with closed‑loop excitation‑control systems for thermal‑power and gas‑turbine generator units, serving as a vital interface board to ensure stable excitation regulation, accurate process data and reliable auxiliary‑system operation.
2. Core Functions
High‑precision acquisition and conversion of excitation AC signalsIt supports accurate sampling of wide‑range AC signals from 0 to 20 kA AC. Built‑in high‑precision signal‑conditioning and operational circuits process complex excitation waveforms and linearly convert them into industry‑standard analog outputs: 0‑5 VDC, 0‑20 mA and 4‑20 mA. Signal‑conversion linearity reaches 0.2 % with overall control accuracy ≤ 1.0 %, guaranteeing complete and precise acquisition of excitation operating data.
Ultra‑wide‑band signal‑response processingOptimized wide‑band signal‑processing circuitry provides a signal‑response bandwidth above 20 kHz. It adapts to complex waveforms and dynamic fluctuations in excitation systems, capturing instantaneous parameter changes in the excitation loop without signal distortion or waveform lag. It is well‑suited for demanding applications such as dynamic excitation regulation, load variation tracking and transient‑fault signal capture.
5 kV high‑voltage electrical‑isolation protectionWithstanding‑isolation capability of 5000 VDC for 1 minute creates full galvanic separation between the high‑voltage excitation acquisition loop and the low‑voltage main‑control loop. It effectively blocks high‑voltage surges, electrical noise and potential‑difference interference originating from the excitation circuit, preventing high‑voltage feedback from damaging main‑control modules and greatly improving electrical safety and operational stability of the excitation‑control system.
Auxiliary‑function expansion for TMR‑redundant architectureDesigned for the TMR (Triple Modular Redundancy) control architecture of the EX2100E system, it expands auxiliary monitoring, interlock‑logic and operating‑condition feedback functions, completing the closed‑loop excitation‑control chain and enhancing fault‑tolerance performance of the whole system. Abnormalities on one single signal link will not disturb overall excitation regulation, substantially reducing the risk of unit shutdown caused by single‑point failures.
Drift‑free stable operation under full operating conditionsIndustrial low‑drift components and precision‑calibrated circuits deliver an ultra‑wide linear measuring range of 0‑120 %. Parameters remain stable across the full temperature and load spectrum without noticeable drift, maintaining consistent signal performance during long‑term continuous operation and eliminating false alarms triggered by temperature rise or load fluctuation.
- Industrial‑reinforced design for long‑term serviceThe PCB is protected by conformal coating, providing dust‑proof, moisture‑proof, anti‑corrosion and anti‑ageing properties. It withstands high‑frequency electromagnetic interference, mechanical vibration and temperature‑humidity variations inside power plants, supporting 7×24‑hour heavy‑duty continuous operation with a low failure rate for year‑round generator‑unit production.
3. Technical Specifications
| Parameter Item | Technical Specification |
|---|---|
| Model No. | IS200EAUXH1A |
| Brand | GE (General Electric, USA) |
| Product Series | GE Mark VI, EX2100 / EX2100E Excitation‑Control System |
| Product Type | TMR Excitation Auxiliary‑Function I/O Interface Board |
| AC Input Range | 0‑20 kA AC wide‑range AC‑signal acquisition |
| Standard Output Signals | 0‑5 VDC, 0‑20 mA, 4‑20 mA multi‑format analog outputs |
| Acquisition Accuracy | Overall accuracy ≤ 1.0 % |
| Linearity Index | Excellent linearity: 0.2 % |
| Effective Linear Measuring Range | 0‑120 % ultra‑wide adaptive range |
| Electrical‑Isolation Rating | 5000 VDC / 1 min high‑voltage dielectric isolation |
| Signal‑Frequency‑Response Range | ≥ 20 kHz ultra‑wide‑band response |
| Protection Process | PCB conformal coating, dust‑proof, moisture‑proof, anti‑corrosion & anti‑ageing |
| Supported Architecture | TMR (Triple Modular Redundancy) control architecture for EX2100E |
| Environmental Adaptability | EMI resistance, vibration resistance, suitable for all‑weather power‑plant operation |
| Key Features | Wide‑band acquisition, high‑precision linear conversion, high‑voltage isolation, redundancy expansion, low temperature drift, high stability & maintenance‑free performance |
4. Working Principle
IS200EAUXH1A implements a complete closed‑loop workflow: excitation AC‑signal acquisition → high‑voltage isolation protection → wide‑band signal conditioning → high‑precision linear conversion → standard‑signal output → redundant closed‑loop feedback.
During generator‑unit operation, the board continuously samples raw high‑voltage AC signals from the excitation loop. High‑voltage isolation circuits first establish galvanic separation between high‑power field circuits and low‑voltage control circuits to block voltage surges and electromagnetic interference and protect downstream control hardware.
Wide‑band conditioning circuits then filter, shape and calibrate complex excitation waveforms to correct signal distortion caused by operating‑condition fluctuations and environmental noise. High‑precision linear‑conversion units transform wide‑range AC waveforms into standard analog signals readable by the PLC and excitation main controller. Processed data is transmitted in real‑time to the EX2100 main‑control unit. Working together with the TMR‑redundant architecture, the system compares excitation parameters, evaluates operating conditions and dynamically adjusts voltage and current, while enabling auxiliary interlock and fault‑monitoring functions. This realizes high‑precision closed‑loop regulation and safety protection for the generator excitation system, ensuring stable grid‑connection, controllable operating states and early fault warning.
5. System‑Architecture Compatibility
This is an original GE dedicated board for the EX2100 / EX2100E excitation system. Its communication protocols, signal logic, mechanical dimensions and electrical parameters are fully natively compatible with the GE Mark VI control system and the TMR triple‑modular‑redundant excitation architecture. No additional configuration, hardware modification or signal adapter is required. Plug‑and‑play replacement is supported, making it ideal for faulty‑board replacement, routine maintenance and system‑upgrade projects.
It seamlessly interfaces with high‑voltage excitation acquisition loops, the excitation main‑control unit, upper‑level SCADA monitoring systems and fault‑diagnosis platforms. Full compatibility is maintained with the complete control chain of signal acquisition, conversion, feedback and interlocking, without modifying existing protection logic, wiring specifications or main‑control programs. Its standardized form factor fits standard power‑plant cabinet layouts and can be rapidly integrated into new excitation‑system builds or retrofits of legacy generator‑unit automation, delivering outstanding universality, interchangeability and expandability.
6. Application Scenarios
Featuring ultra‑wide‑band response, high‑precision linear conversion, high‑voltage isolation protection and redundant fault‑tolerant stability, this board is engineered for the harsh operating conditions of generator excitation systems, including high temperature, heavy electromagnetic interference, frequent load swings and round‑the‑clock continuous operation. It is primarily deployed in GE EX2100 / EX2100E excitation‑control systems for large‑scale thermal‑power and gas‑turbine power plants.
Typical applications include high‑precision AC‑signal acquisition and conversion within excitation loops, dynamic excitation‑parameter monitoring, auxiliary interlock‑logic expansion and transient‑fault signal capture. It is a critical component supporting accurate voltage regulation, stable load control, safe grid‑connection and precise fault alarming for generator units. It is widely used in daily maintenance of power‑plant excitation systems, legacy control‑system retrofits, excitation‑equipment fault repair and automation‑accuracy upgrades. The board solves common deficiencies of traditional excitation‑signal circuits such as waveform distortion, slow response, poor noise immunity and weak fault tolerance, greatly improving excitation‑regulation precision and overall system reliability to support long‑term, safe, stable and efficient grid‑connected power generation.
