GE Multilin 750-P5-G5-S1-HI-A20-R-E Feeder Protection Relay

Product Description

The GE Multilin SR750 series feeder management relay, model 750-P5-G5-S1-HI-A20-R-E, is an advanced numerical protection device engineered for medium-voltage feeder protection in utility substations and industrial power distribution systems. It integrates protection, control, metering, monitoring, and communication functions into a single compact relay platform.

Designed for continuous duty in harsh electrical environments, this relay supports high-accuracy current and voltage sensing, flexible programmable logic, and extensive I/O capability, enabling reliable feeder protection and seamless SCADA integration.

Key Functional Overview

The 750-P5-G5-S1-HI-A20-R-E provides fast and selective fault detection for feeders exposed to overloads, short circuits, ground faults, and abnormal voltage conditions. Its embedded logic allows customized control schemes such as breaker supervision, trip logic, alarms, and interlocking without the need for external PLCs.

An enhanced front-panel display with keypad supports local configuration, diagnostics, and real-time system visibility.

Technical Specifications

• Relay Series: GE Multilin SR750 Feeder Management Relay

• Phase Current Inputs: 5 A nominal

• Zero-Sequence Current Input: 1 A

• Voltage Inputs: 100–120 VAC nominal via VTs

• Protection Functions:

• Phase overcurrent (instantaneous, time, inverse)

• Ground fault protection

• Phase imbalance / negative sequence

• Undervoltage and overvoltage

• Breaker failure and trip circuit supervision

• Control Functions:

• Feeder trip and alarm control

• Breaker status monitoring

• Programmable logic (FlexLogic™)

• Analog Outputs: Eight 4–20 mA outputs for metering and SCADA feedback

• Digital Outputs: Multiple form-A / form-C relay contacts for trip and signaling

• Communications: RS485 with Modbus RTU; Ethernet available depending on configuration

• Auxiliary Power Supply (HI):

• 88–300 VDC

• 70–265 VAC, 48–62 Hz

• User Interface: Enhanced LCD display, front keypad, red breaker-closed LED

• Mounting: Panel-mounted relay chassis

• Operating Temperature: −40 °C to +60 °C

• Weight: 10 lb

Typical Applications

• Medium-voltage feeder protection in utility substations

• Industrial power distribution systems

• Mining, oil & gas, and heavy manufacturing facilities

• Critical infrastructure requiring high reliability and detailed fault records

FAQ

Q: Can this relay be integrated into existing SCADA systems?
A: Yes. The 750-P5-G5-S1-HI-A20-R-E supports Modbus RTU communication and optional Ethernet, enabling straightforward SCADA or DCS integration.

Q: Does the relay support custom logic schemes?
A: Yes. GE Multilin FlexLogic™ allows user-defined protection and control logic without additional hardware.

Q: Is the relay suitable for harsh environments?
A: Yes. It is rated for extended temperature ranges and designed for continuous operation in utility-grade electrical environments.