Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 750-P5-G5-D5-HI-A20-R-E-H |
| Manufacturer | GE Multilin / GE Vernova |
| Product Series | Multilin 750/760 Feeder Management Relay |
| Product Type | Digital Feeder Protection Relay |
| Phase Current Inputs (P5) | 5 A secondary |
| Ground Current Inputs (G5) | 5 A secondary |
| Sensitive Ground Input (D5) | 5 A, voltage/frequency/synchrocheck capable |
| Control Power (HI) | 88–300 VDC; 70–265 VAC @ 48–62 Hz |
| Analog Outputs (A20) | Eight (8) isolated 4–20 mA |
| Breaker Closed LED (R) | Red LED indicator |
| Display (E) | Enhanced backlit LCD with improved keypad |
| Environmental Protection (H) | Conformal coating for harsh/humid environments |
| Communication Protocols | Modbus RTU, DNP 3.0 Level 2 |
| Event Recorder Capacity | 512 time-tagged events |
| Oscillography | Up to 32 power cycles, 10 records |
| Operating Temperature | –40°C to +60°C |
| Dimensions (W × H × D) | ~178 mm × 165 mm × 216 mm |
| Weight | ~7.6 kg (16.8 lb) |
| Mounting Style | Panel-mount drawout case |
Main Features and Advantages
Comprehensive Protection Suite: The 750-P5-G5-D5-HI-A20-R-E-H integrates an extensive ANSI protection library covering phase, neutral, ground, and negative-sequence time and instantaneous overcurrent elements (51/50), directional control (67), breaker failure (50BF), undervoltage and overvoltage (27/59), underfrequency and overfrequency (81), and synchrocheck (25). This breadth allows the 750-P5-G5-D5-HI-A20-R-E-H to serve as the primary protection device for incoming feeders, bus ties, and distribution circuits, replacing multiple discrete relays with a single intelligent electronic device.
Advanced Metering and Fault Analysis: Beyond protection, the 750-P5-G5-D5-HI-A20-R-E-H provides precise built-in metering of current, voltage, power, energy, and power factor, eliminating the need for separate panel meters and transducers. The relay’s waveform capture records four currents, three voltages, logic input states, and output relay status during fault events, giving protection engineers the data required for post-event analysis without deploying portable recorders. The 512-event recorder retains a chronological log of trips, alarms, and system changes for compliance reporting and preventive maintenance planning.
Flexible Communication and Integration: The 750-P5-G5-D5-HI-A20-R-E-H supports Modbus RTU and DNP 3.0 Level 2 protocols over RS485/RS422 and RS232 serial interfaces, enabling seamless integration with substation SCADA, plant DCS, and remote terminal units. Eight isolated 4–20 mA analog outputs provide direct hardwired signals to legacy monitoring systems, while the enhanced display and EnerVista setup software simplify configuration and setpoint management. The conformal-coated H-variant circuitry ensures reliable operation in humid, corrosive, or dusty industrial environments where standard electronics would degrade.
