I/O modules

The SR750 750-P5-G5-S5-HI-A20-R-E functions as a sophisticated Feeder Management Relay within the acclaimed SR750 series. GE designed this intelligent electronic device to protect and monitor electrical feeders in industrial power systems. Engineers rely on this relay to detect faults and execute trip commands with precision. Consequently, the SR750-P5-G5-S5-HI-A20-R-E ensures continuous operation of critical distribution networks.

Core Protection Architecture

The SR750 series incorporates advanced microprocessor technology for reliable feeder protection and control applications. This specific configuration includes phase, ground, and sensitive current inputs all calibrated for 5 Amp secondaries. The relay continuously samples these currents to detect overcurrent, ground fault, and sensitive earth fault conditions. Additionally, it executes protection algorithms locally without depending on upstream controllers. Such distributed intelligence reduces trip times during critical fault events significantly.

Technical Specifications and Physical Attributes

Understanding the exact specifications of the 750-P5-G5-S5-HI-A20-R-E ensures proper integration into existing power systems. The relay’s rugged construction withstands the electrical and environmental challenges of industrial substations. Below you will find a detailed breakdown of its physical and electrical characteristics:

Current Sensing and Protection Capabilities

The 750-P5-G5-S5-HI-A20-R-E features three distinct current sensing paths for comprehensive feeder protection. Phase current inputs monitor all three phases for overcurrent and unbalance conditions continuously. The ground current input uses zero sequence sensing for sensitive ground fault detection. Additionally, the sensitive current input provides enhanced protection for high-resistance ground faults. This multi-input architecture ensures the relay detects a wide range of fault conditions effectively.

Power Supply and Auxiliary Systems

The SR750-P5-G5-S5-HI-A20-R-E accepts a universal control power range for global application flexibility. It operates on either 80-300 V DC or 70-265 V AC without requiring configuration changes. The internal power supply converts incoming power to regulated voltages for all internal circuits. This wide-range design simplifies inventory requirements for facilities with multiple voltage systems. Therefore, the relay suits installations ranging from medium-voltage switchgear to control house panels.

Analog Outputs and Monitoring Features

This SR750 configuration includes eight 4-20 mA analog outputs for remote monitoring and control applications. These outputs can represent various measured parameters like current, voltage, or power values. Users can assign specific parameters to each analog output independently through relay settings. The red breaker closed LED provides immediate visual confirmation of circuit breaker status. Such features enhance operator awareness and reduce the need for additional panel indicators.

Integration with Industrial Power Systems

Within the GE SR750 ecosystem, this relay communicates with SCADA systems for comprehensive power management. It supports multiple communication protocols for integration with various automation platforms. The relay records event data for post-fault analysis and system improvement studies. For facilities operating critical power distribution networks, this module provides reliable protection. Its enhanced firmware includes advanced logic for coordination with upstream and downstream devices.

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