Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 750-P5-G5-S5-HI-A20-R-E |
| Manufacturer | GE Multilin (GE Vernova / GE Grid Solutions) |
| Product Type | Feeder Management Relay / Digital Protection IED |
| Series | GE Multilin 750/760 Feeder Management Relays |
| Phase CT Rating | 5 A (P5) |
| Zero-Sequence CT Rating | 5 A (G5) |
| Sensitive Ground CT Rating | 5 A (S5) |
| Control Power | 88–300 VDC / 70–265 VAC, 48–62 Hz (HI) |
| Analog Outputs | 8 × 4–20 mA (A20) |
| Breaker Closed Indicator | Red LED (R) |
| Display | Enhanced LCD with expanded keypad (E) |
| Communication Protocols | Modbus RTU, DNP 3.0, IEC 60870-5-103 |
| Serial Ports | RS232 (front), RS485/RS422 (rear) |
| Operating Temperature | -40°C to +70°C |
| Mounting | Draw-out relay, panel or rack mount |
| Weight | Approximately 3.86 kg |
Main Features and Advantages
Comprehensive feeder protection in a single platform: The 750-P5-G5-S5-HI-A20-R-E integrates time-overcurrent (TOC) and instantaneous overcurrent (IOC) protection with 15 selectable curve shapes including FlexCurves, directional overcurrent elements, negative-sequence overcurrent, undervoltage, overvoltage, and frequency protection . This consolidation reduces panel space, wiring complexity, and the coordination burden associated with multiple discrete relays, while the draw-out construction allows rapid replacement without disturbing rear field wiring.
Sensitive ground fault detection for high-impedance systems: The “S5” sensitive ground input on the 750-P5-G5-S5-HI-A20-R-E enables detection of low-level leakage currents that conventional ground CTs cannot reliably capture. This is particularly valuable for feeders on high-impedance grounded or resonant-grounded systems, where fault currents may be limited to a few amperes and conventional protection would remain blind to developing insulation degradation .
Analog output flexibility: The 750-P5-G5-S5-HI-A20-R-E provides eight isolated 4–20 mA analog outputs, enabling direct interfacing with SCADA, DCS, or plant monitoring systems without additional transducers. Measured or calculated parameters—including phase currents, power, frequency, and thermal loading—can be mapped to these outputs for real-time remote indication .
Enhanced local interface: The “E” suffix denotes the enhanced display configuration, featuring a larger LCD and expanded keypad for on-site navigation of metering, status, maintenance, trip counter, and arcing current data. The 750-P5-G5-S5-HI-A20-R-E supports both hardware and passcode security to prevent unauthorized setpoint changes .
Application Field
The 750-P5-G5-S5-HI-A20-R-E is deployed primarily in distribution substations and industrial facilities where reliable feeder protection is critical to operational continuity. In utility networks, it serves as the primary protection relay for medium-voltage feeders originating from substation busbars, providing overcurrent and directional protection that can discriminate between forward and reverse faults—essential in ring-bus or distributed generation configurations where fault current may flow in either direction .
Industrial plants—including petrochemical complexes, steel mills, and manufacturing facilities—use the 750-P5-G5-S5-HI-A20-R-E to protect incoming feeders, bus ties, and transformer bays. The sensitive ground input is particularly relevant in facilities with resistance-grounded or ungrounded distribution systems, where early detection of insulation faults prevents escalation to phase-to-phase faults and unplanned outages.
Renewable energy installations, including wind and solar farms, employ the 750-P5-G5-S5-HI-A20-R-E for collector feeder protection. Its directional overcurrent capability supports coordination in systems with multiple generation sources, while the 4–20 mA outputs provide analog telemetry to plant control systems without requiring protocol gateways. The relay’s wide temperature range and optional conformal coating make it suitable for outdoor enclosures and remote substations.
