ALSTOM 029.202.781 Protection Relay
The ALSTOM 029.202.781 is a versatile numerical protection relay belonging to the MicOM series, specifically designed for feeder overcurrent and earth fault protection in electrical distribution networks. This relay integrates comprehensive protection functions, advanced measurement capabilities, and flexible communication options to meet the requirements of modern utility and industrial substations.
Key Features
Directional and non-directional overcurrent protection (50/51/67)
Sensitive earth fault protection with directional capability (50N/51N/67N)
Four-shot autoreclosure with synchronism check
Under‑voltage and over‑voltage protection (27/59)
Comprehensive fault and disturbance recording
Multiple communication protocols: IEC 61850, Modbus RTU, DNP3, 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
Protection accuracy: ±2% or better
Binary inputs: 8 digital inputs (24‑220 V DC)
Output relays: 6 trip contacts, 4 signal contacts
Communication ports: 2 Ethernet (RJ45/fiber), 2 RS485
Power supply: 24‑250 V DC / 100‑240 V AC
Operating temperature: -25°C to +70°C
Applications
The 029.202.781 is ideally suited for protection of distribution feeders, radial and looped systems, as well as industrial plant entrances. It can be deployed in primary and secondary substations, renewable energy power plants, and large industrial facilities. The relay’s directional elements enable selective coordination in complex network topologies.
Integration and Usability
Designed for seamless integration into automation systems, the relay supports horizontal GOOSE messaging for fast interlocking schemes and vertical communication with station controllers. Its embedded web server allows easy configuration and monitoring via standard browsers. The relay also features a user‑programmable logic editor for custom protection schemes.
With its robust design and proven field performance, the ALSTOM 029.202.781 delivers dependable protection, reducing downtime and extending asset life.
