DS2020FEBNRX075A - 75 A NRX/NRP Field Exciter Module

SPECIFICATIONS:

Part Number: DS2020FEBNRX075A
Manufacturer: General Electric
Product Type: 75 A NRX/NRP Field Exciter Module
Function: Field Exciter Module
Series: EX2100
Control Interface: Compatible with EX2100e, LS2100e, Mark VIe
Rated DC Output Current: 75 Amperes
Frequency Range: 50 / 60 Hz
Rated Output Voltage: Up to 250–300 VDC
Operating Temperature: -20°C to +60°C
Size: 26.41 cm High x 21.33 cm
Availability: In Stock
Repair: 3 to 7 Working Days
Country of Origin: United States

FUNCTIONAL DESCRIPTION:

DS2020ACHAG1 is a 75 A NRX/NRP Field Exciter Module designed and manufactured by General Electric as a part of the AC2000 series used in the Drive Control Systems. The GE 75 A NRX/NRP Field Exciter Module is a critical component in modern static excitation systems, designed specifically for synchronous generators and motors. It plays a vital role in supplying controlled DC to the generator’s field winding, thereby regulating the output voltage and maintaining system stability. The module is part of GE’s excitation system portfolio, often integrated with digital control units such as the EX2100e or LS2100e. The “NRX” and “NRP” designations stand for Non-Reversing Exciter and Non-Reversing Power, referring to the internal power conversion topology that prevents power flow reversal and ensures precise and stable excitation.

INSTALLATION:

Installation of the GE 75 A NRX/NRP Field Exciter Module requires careful planning and adherence to standard electrical and mechanical practices. Before installation, it is essential to inspect the site conditions to ensure that the cabinet or panel housing the module has sufficient cooling, ventilation, and protection from dust and moisture. The module is typically rack-mounted or installed in a panel inside the excitation cubicle. It must be securely grounded, and all mechanical fittings should be checked for tightness. Electrically, the AC power input is usually drawn from a transformer or auxiliary power source, while the DC output terminals are connected to the generator’s field winding. Signal and control cables link the exciter module to the automatic voltage regulator (AVR) or digital control unit, facilitating real-time control and feedback.

OPERATIONS:

In normal operation, the GE 75 A NRX/NRP Field Exciter Module is responsible for generating and maintaining the appropriate DC excitation current needed by the generator’s field winding. Once the generator begins its startup sequence, the excitation system energizes, and the exciter module starts supplying field current. The module’s output is governed by the AVR, which monitors generator terminal voltage and dynamically adjusts excitation to maintain the desired voltage level. This ensures system stability and enables the generator to respond effectively to load variations and grid disturbances. The excitation system is equipped with comprehensive protection features that monitor parameters like overcurrent, overvoltage, field ground faults, and thermal overloads. These protections safeguard both the exciter module and the generator.

BENEFITS OF FIELD EXCITER MODULE:

Its ability to deliver precise and stable field current enhances generator voltage control, which is critical for maintaining grid reliability and supporting reactive power compensation. The fast response time of the module allows it to react effectively during system transients or faults, helping to prevent voltage collapse and supporting grid recovery. Its modular design makes installation, maintenance, and replacement straightforward, reducing downtime and increasing system availability. The module is fully compatible with GE’s digital control platforms like the EX2100e, enabling advanced monitoring, remote diagnostics, and seamless integration into plant automation systems. Additionally, the module’s built-in protection and self-monitoring capabilities ensure long-term reliability and operational safety.

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FREQUENTLY ASKED QUESTIONS:

What is the primary function of the 75 A NRX/NRP Field Exciter Module?

This module delivers controlled DC excitation current (up to 75 A) to the rotor field winding of a synchronous generator or motor. It supports dynamic voltage regulation and reactive power control through integration with digital AVR systems.

How does the module manage field voltage regulation?

Through feedback from generator PTs and CTs, the digital controller adjusts PWM pulses or SCR firing angles (based on configuration) to modulate the field voltage precisely and maintain generator terminal voltage within ±1% tolerance.

How does the Field Exciter Module function within an excitation system?

The module converts AC power from the grid into DC power, which is then supplied to the rotor field winding. This regulation of field current directly controls the output voltage of the synchronous generator and maintains system stability.