ALSTOM NRD108028 8RDB43655 SA43655.E Protection Relay
The ALSTOM NRD108028 is a fully numerical, multifunction protection relay designed for feeder overcurrent and earth fault applications in utility and industrial power systems. This relay integrates advanced measurement, protection, and control functions within a compact housing, ensuring reliable operation and enhanced power system stability.
Key Features
Directional and non-directional overcurrent protection (50/51/67)
Sensitive earth fault protection (50N/51N/67N)
Four-shot autoreclosure with check synchronism
Comprehensive event recording and fault oscillography
Multiple communication protocols: IEC 61850, Modbus, DNP3, and IEC 60870-5-103
Local HMI with graphical display and keypad
Conforms to IEC 60255 and IEEE C37.90 standards
Technical Specifications
Rated current: 1 A or 5 A (configurable)
Rated frequency: 50 / 60 Hz
Current input dynamic range: 100 x In
Accuracy: ±2% or better for protection elements
Binary inputs: 8 digital inputs, 24 V DC / 48 V DC / 110 V DC / 220 V DC
Output relays: 6 trip contacts, 4 signal contacts
Communication ports: 2 x Ethernet (RJ45 or fiber), 2 x RS485
Power supply: 24–250 V DC / 100–240 V AC
Operating temperature: -25°C to +70°C
Applications
The NRD108028 is ideally suited for protection of distribution feeders, radial and looped systems, as well as industrial plant networks. It can be deployed in substations, power generation facilities, and large industrial sites where reliable overcurrent and earth fault protection is required. The relay’s advanced communication capabilities make it a perfect fit for smart grid and digital substation initiatives.
Model Variations
The relay is available under multiple ordering codes including NRD108028, 8RDB43655, and SA43655.E, which denote different hardware configurations and preloaded firmware options. These variants maintain the same core protection functionality but may offer additional I/O or protocol support tailored to specific project requirements.
Integration and Compatibility
Designed for seamless integration into existing automation architectures, the NRD108028 supports vertical communication with station controllers and SCADA systems. Its compliance with IEC 61850 Edition 2 ensures interoperability with other IEDs, while the embedded web server allows for easy configuration and monitoring via standard browsers.
With a robust design and proven field performance, the ALSTOM NRD108028 protection relay delivers dependable protection and control, helping to minimize downtime and extend equipment life.
