GE MULTILIN SR750 750-P1-G1-S1-HI-A20-R-E | Feeder Management Relay

The GE Multilin 750 (part of the SR750/760 series) is a highly reliable, compact feeder management relay designed for the protection, control, and monitoring of medium-voltage distribution feeders. It offers a comprehensive suite of protective functions, making it a staple in industrial and utility power systems where precise monitoring and rapid fault clearance are required.

⚙️ Product Parameters & Technical Datasheet

• Device Type: Feeder Management Relay

• Part Number Configuration: 750-P1-G1-S1-HI-A20-R-E

  • P1: 5A Phase/Neutral CTs

  • G1: 1A/5A Ground CT

  • S1: Standard (No rear display)

  • HI: High-range power supply (88-300 VDC / 85-265 VAC)

  • A20: Standard features with no additional options

  • R: RS485 communication port

  • E: Enhanced communication (Ethernet)

• Protection Functions: Overcurrent, Undervoltage, Overvoltage, Underfrequency, Overfrequency, and Thermal Overload

• Dimensions: Standard draw-out case for panel mounting

• Weight: Approximately 4.5 kg

• Origin: Canada / United States

🏗️ Application Areas

The SR750 is versatile and widely utilized across various sectors:

• Utility Distribution: Primary protection for medium-voltage distribution lines.

• Industrial Facilities: Motor control centers (MCCs) and plant substations.

• Data Centers: Providing high-accuracy monitoring and rapid protection for incoming feeder circuits.

• Infrastructure: Protecting critical infrastructure components where downtime must be minimized through advanced diagnostics.

🛠️ Product Usage Instructions

1. Mounting: The relay features a draw-out design. Ensure the case is securely mounted to the panel cutout. Before inserting the relay, verify that all terminal blocks at the rear are securely wired.

2. Safety Wiring: The relay must be grounded to the panel earth bus. Ensure that Current Transformer (CT) inputs are always shorted before removing the relay from its case to prevent high-voltage build-up on open CT secondary circuits.

3. Communication: Utilize the RS485 or Ethernet ports to connect to your SCADA or local HMI. Configure the communication settings (Baud rate, Parity, IP address) using the front panel or GE EnerVista software.

4. Configuration: Use the EnerVista 750/760 Setup software to program protection curves, relay logic, and monitoring thresholds. Always save a backup of the configuration file (.750) after commissioning.

5. Diagnostics: Monitor the front panel LEDs for “Pickup,” “Trip,” and “Self-Test” status. Any internal relay faults will be indicated by a dedicated “Relay Health” alarm.

6. 

❓ Frequently Asked Questions (Q&A)

What does the “HI” power supply signify? The “HI” designation indicates a wide-range power supply, allowing the relay to operate on both high-voltage DC (88-300V) and AC (85-265V) sources, ensuring compatibility with most substation battery systems.

Can I replace a 750 with a 760? While similar, the 760 includes additional features like more I/O or advanced monitoring. It is generally recommended to replace a 750 with an identical 750 part number to avoid logic and I/O mapping issues.

What should I do if the “Relay Health” LED is red? A red health LED indicates an internal hardware failure. First, power cycle the unit. If the status remains, the internal diagnostics have detected a component failure, and the relay should be sent for repair or replaced.

How do I extract fault data? You can extract fault logs, waveform captures, and event records via the EnerVista software. The relay stores these in non-volatile memory, ensuring data is retained even after a power loss.

📋 Similar Model Recommendations

1. GE Multilin 760 (Enhanced Feeder Management)

2. ABB Relion 615 Series

3. Siemens Siprotec 7SJ62/64

4. Schneider Electric Sepam 40 Series

5. SEL-751 Feeder Protection Relay

6. Eaton EDR-5000

7. Alstom MiCOM P127

8. VAMP 200 Series

9. Basler Electric BE1-11f

10. Woodward MFR Series