Description
The GE Multilin 750-P5-G5-S5-HI-A20-R is a member of the UR (Universal Relay) family, specifically designed for the protection, control, and monitoring of electrical feeders. This Intelligent Electronic Device (IED) is widely used in utility and industrial distribution substations. It provides comprehensive protection against overcurrent, undervoltage, and ground faults, while offering advanced metering, data logging, and programmable control logic to ensure grid stability and equipment safety.

⚙️ Technical Specifications
- Device Type: Feeder Management Protection Relay
- Protection Functions: * 50/51: Instantaneous/Time Overcurrent
- 27/59: Undervoltage/Overvoltage
- 81: Frequency protection
- 50N/51N: Neutral Ground Overcurrent
- Part Number Configuration:
- 750: Series designation
- P5: High-density I/O configuration
- G5: Standard communication options
- S5: Advanced security and firmware features
- HI: High-range power supply (125/250V DC or 120/240V AC)
- A20: Standard current/voltage input rating
- R: Rear-mount enclosure type
- Communication: Modbus RTU, DNP 3.0, and IEC 60870-5-103 protocols
- Monitoring: Real-time waveforms, event recording, and oscillography
- Operating Temperature: -40°C to +60°C (ruggedized for substation environments)
📋 Recommended Components & Integration
- Current/Voltage Transformers (CTs/VTs): External sensing required for protection inputs.
- EnerVista Setup Software: The essential PC suite for programming setpoints and analyzing events.
- RS485/Fiber Optic Media Converters: For robust communication over long substation distances.
- Test Blocks (e.g., FT-14): Essential for safe in-service testing of the relay without disrupting the feeder.
- Substation Gateway: To aggregate data from multiple relays for SCADA integration.
- Trip/Close Control Wiring: High-reliability, shielded control cables for circuit breaker operation.
- Battery Backed Power Supply: For continuous operation during substation control voltage loss.
- Digital/Analog I/O Expansion Modules: For increased interlocking requirements.
- Relay Logic Configuration Cable: Serial-to-USB cable for local commissioning.
- Replacement Control Power Module: Essential spare for critical infrastructure uptime.

