DS2020FEANRP100A | GE Mark VIe FEAN Module | In Stock

Description

Product Introduction

The GE DS2020FEANRP100A functions as the Field Excitation and Analog (FEAN) module within the Mark VIe control platform, providing integrated field excitation control and analog I/O for large generator excitation systems up to 100 A field current. This module interfaces with the Mark VIe controller via ISBus communication and offers 4 configurable analog inputs, 2 analog outputs, and dedicated field excitation outputs for controlling generator field current, voltage, and reactive power.

The model number breaks down as: FEAN (Field Excitation and Analog), RP100 (100 A field excitation output rating), A (Revision A). The primary differentiator is the high 100 A field excitation power stage—the FEAN includes a built-in 100 A excitation output (SCR-based) with integrated protection and diagnostics, eliminating the need for a separate excitation power module for generators with field current requirements up to 100 A. This is the highest-capacity FEAN variant, designed for large steam and combustion turbine generators.

Key Technical Specifications

Key Selling Points & Differentiators

• Highest Current Capacity (100 A): 100 A continuous field excitation output—suitable for large generators (typically up to 100 MW and above) with field current requirements up to 100 A.
• Integrated Excitation Power Stage: Built-in 100 A SCR bridge and protection—eliminates the need for a separate excitation power module, reducing cabinet space and cost compared to using an ERCA with external power stage.
• Combined Excitation and Analog I/O: Integrated 4 analog inputs and 2 analog outputs—provides sensor inputs (field current, voltage, temperature) and control outputs (setpoints, alarms) without additional I/O modules.
• Comprehensive Field Protection: Overcurrent, overvoltage, under/over frequency, and field loss detection—provides complete protection for the generator field and prevents damage to the excitation system.
• Flexible Control Modes: Voltage regulator, current regulator, and power factor control modes—adapts to different excitation system requirements.
• Field Diagnostics: Field current and voltage monitoring, bridge health assessment, and SCR health monitoring—enables predictive maintenance of the excitation system.
• Advanced Thermal Management: Forced air cooling with thermal monitoring—ensures reliable operation at high currents.
• Full Live Test Certification: Each unit undergoes a 72-hour burn-in with full field output simulation (100 A), analog I/O verification, ISBus communication testing, and protection feature validation. We log the MAC ID, calibration data, and diagnostic baselines for traceability.
• Direct Drop-In Replacement: Form-fit-function compatible with DS2020FEANRP100 and earlier FEAN revisions. Existing wiring and terminal assignments remain unchanged.
• 90-Day Warranty: Includes technical support and cross-ship replacement within 24 hours if the module fails to provide excitation output, reports incorrect analog values, protection circuits fail to operate, or diagnostics report false faults.

Frequently Asked Questions (FAQ)

Q1: What’s the difference between the DS2020FEANRP100A and the DS2020FEANRP075A?

The RP100A provides 100 A continuous field excitation output, while the RP075A provides 75 A. The RP100A uses larger SCRs, a more robust heat sink, and has higher power handling capability. The analog I/O and control features are identical. The RP100A is suitable for generators with field current requirements between 75 A and 100 A, while the RP075A is for generators up to 75 A. The RP100A also requires forced air cooling at full load, while the RP075A can operate with natural convection at lower currents.

Q2: What’s the maximum generator size (MW) for the FEANRP100A?

The maximum generator size depends on the field current requirement at rated load. The RP100 provides 100 A continuous. For a typical generator, field current at rated load is approximately 1-2 A per MW (for brushless excitation systems) or 2-4 A per MW (for static excitation systems). As a general guideline, the RP100 is suitable for generators up to 60-100 MW, depending on the excitation system type and field current requirement. Always check the generator’s nameplate field current at rated load before specifying. Some high-efficiency generators may require less field current per MW.

Q3: Does the FEANRP100A require forced air cooling at full load?

Yes. At 100 A continuous output, the module generates significant heat—approximately 250 W of losses. The RP100A includes a built-in fan with an airflow of 40 CFM. You must also ensure adequate airflow in the cabinet. At 100 A output and 50°C ambient, the internal temperature will approach the thermal limit. We recommend forced air circulation (at least 50 CFM across the module) and maintaining cabinet ambient below 50°C for full 100 A output. The thermal protection will derate the output if the temperature exceeds 75°C (approximately 80 A at maximum derating).

Q4: Can I use the FEANRP100A for a brushless excitation system?

Yes. The FEANRP100A is compatible with brushless excitation systems. In a brushless system, the excitation output (field current) goes to the rotating rectifier assembly, which rectifies the AC to DC for the generator field. The FEAN provides the field current to the rotating rectifier. The RP100A includes the control modes (voltage regulator, current regulator, power factor control) required for brushless excitation systems, and the field diagnostics are compatible. Ensure your brushless exciter’s field current requirement is within the RP100A’s 100 A capacity.

Q5: The FEAN reports a bridge health warning at 50% load—what does that mean?

A bridge health warning at partial load indicates that the SCR bridge is showing signs of degradation—typically one or more SCRs have increased leakage current, or the bridge temperature is higher than expected for the load. The warning at 50% load is concerning because the bridge should be healthy at partial load. Check: (1) the cooling fan is operating (listen for it), (2) the AC input voltage is balanced (phase-to-phase should be within 5%), (3) the firing pulses are clean (use an oscilloscope on the gate drive). If the warning persists, the bridge may need replacement. Schedule a maintenance inspection within the next 3-6 months.

Q6: The field overvoltage protection tripped during a load rejection event. Was that expected?

Yes. During a load rejection (loss of load), the generator terminal voltage can rise significantly, and the excitation system may have to reduce field current rapidly. The field overvoltage protection in the FEAN monitors the field voltage during this transient. If the field voltage exceeds the setpoint (typically 10-20% above nominal), the protection trips to prevent damage to the field winding. This is expected behavior during load rejections. Check the protection setpoint in ToolboxST—it should be coordinated with the generator’s overvoltage protection. If the trip occurs during normal operation (not a load rejection), check the setpoint or the voltage regulator gain.

Q7: What’s the typical lead time for the FEANRP100A, and do you recommend stocking spares?

The FEANRP100A is a specialized, lower-volume module—we maintain 2-4 units in inventory. Standard lead time for orders of 1-2 units is 3-5 weeks due to the specialized 100 A bridge testing and validation (72-hour burn-in). For critical large generators using the FEAN, we strongly recommend stocking one spare module per site. If you have a fleet of 5+ large turbines, a 20% spare ratio is standard practice due to the criticality of the module—a failed FEAN will cause the generator to lose excitation, leading to a turbine trip. If you need immediate delivery and the RP100 is out of stock, consider using a separate ERCA controller with an external 100 A excitation power module—though this requires cabinet space, wiring, and additional configuration. Call our support line for expedited options.

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