GE SR750-P1-G1-S1-HI-A20-G – Feeder Protection Relay

Applications

The GE SR750-P1-G1-S1-HI-A20-G is a microprocessor-based feeder protection relay used extensively in medium- and high-voltage distribution networks. It provides comprehensive protection, control, and monitoring for electrical feeders in industrial, utility, and commercial power systems.
Its wide range of protective elements makes it ideal for:

• Feeder overcurrent and earth fault protection

• Motor control centers (MCCs)

• Power distribution panels and switchgear

• Industrial process automation

• Substation control and SCADA integration

By combining high-speed fault detection and advanced communication capabilities, the SR750 ensures continuous power system reliability and minimizes downtime.

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Overview

The GE Multilin SR750 series represents one of GE’s most versatile relay platforms, offering digital precision and network-ready operation. The SR750-P1-G1-S1-HI-A20-G variant integrates programmable logic, event recording, and fault analysis tools, providing engineers with deep insights into system performance.

This relay not only performs essential protection functions but also supports real-time monitoring, metering, and remote configuration, making it an essential element of modern intelligent power management systems.

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Technical Specifications

• Model Number: SR750-P1-G1-S1-HI-A20-G

• Manufacturer: GE (General Electric) – Multilin Division

• Type: Feeder Protection Relay

• Power Supply: 90–250 V AC/DC

• Input/Output: Configurable digital and analog I/O ports

• Protection Functions: Phase, ground, and neutral overcurrent; directional elements; breaker failure

• Trip Timing Accuracy: < 2 ms

• Communication Protocols: Modbus, DNP3, IEC 61850 (depending on firmware)

• Mounting: Panel or rack-mounted

• Temperature Range: –40°C to +70°C

• Display: LCD with keypad navigation

• Enclosure Rating: IP54 (front panel)

• Compliance: IEEE, IEC, and CE standards

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Main Features

• Comprehensive Feeder Protection: Includes phase, ground, and negative-sequence overcurrent detection.

• Flexible Communication: Multi-protocol support for SCADA and energy management systems.

• Advanced Event Recording: Stores time-stamped data for fault analysis and maintenance planning.

• Self-Test and Diagnostics: Continuous internal monitoring to detect malfunctions before failures occur.

• User-Friendly Interface: Equipped with a front-panel LCD display and intuitive menu navigation.

• Custom Logic Design: Supports programmable logic for user-specific protection schemes.

• High Immunity to EMI/RFI: Designed for stable performance in harsh electrical environments.

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Construction and Components

The SR750-P1-G1-S1-HI-A20-G relay features a rugged modular design, with a microprocessor control unit, I/O interface board, and front panel operator interface. The casing provides mechanical durability and protection against dust and vibration. Internally, high-quality relays and solid-state components ensure long-term operational stability.

The front interface allows local setup and monitoring, while rear ports enable integration with Ethernet or RS-485 communication networks.

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Installation and Setup

Mounting the relay is straightforward—secure it within the control panel cutout and connect it to CTs (current transformers), PTs (potential transformers), and trip circuits according to GE’s wiring diagrams.
After power-up, configuration can be performed through the front keypad or GE EnerVista SR configuration software.
Routine maintenance includes firmware updates, contact inspection, and verification of calibration values.

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Operation and Maintenance Tips

• Periodically test trip and communication functions to verify protection integrity.

• Keep the relay’s firmware up to date to maintain compatibility with new communication standards.

• Maintain a clean operating environment to prevent dust accumulation inside ventilation ports.

• Always use GE-certified accessories for replacements or upgrades.

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Conclusion

The GE SR750-P1-G1-S1-HI-A20-G combines advanced protection logic, robust hardware, and user-friendly configuration tools into one efficient platform. It ensures dependable feeder protection and supports smart grid connectivity, making it an indispensable component in modern power distribution automation.

IS200 series under GE Automation & Control. It is specifically designed for the DCS (Distributed Control System) of gas turbines, power plants, and other large-scale industrial processes. Adopting a VME-bus architecture, the module can be directly inserted into a VME-frame, providing high-speed and reliable discrete signal acquisition and control functions.

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