I/O modules

The GE SR750 750-P5-G5-S5-HI-A20-R-E functions as an advanced Feeder Management Relay within the trusted SR750 series from General Electric. This intelligent electronic device provides complete protection and control for power distribution feeders. We supply this configured relay to enhance the reliability of your electrical infrastructure. It monitors phase current, ground current, and sensitive current with exceptional precision.

Technical Specifications and Physical Characteristics

Understanding the exact specifications of the GE SR750 750-P5-G5-S5-HI-A20-R-E ensures proper integration into your power management system. This relay features a robust enclosure with clear visual indication including a red breaker closed LED.

Current Input Configuration and Sensing Capabilities

The GE SR750 750-P5-G5-S5-HI-A20-R-E provides comprehensive current sensing for complete feeder protection. Its multiple input channels monitor different aspects of the power system simultaneously.

• Phase Current Inputs: The relay accepts 5 Amp phase current inputs from standard CTs. This configuration suits most industrial and utility feeder applications.

• Ground Current Input: A dedicated 5 Amp ground current input monitors zero sequence current. Consequently, it detects ground faults with high sensitivity.

• Sensitive Current Input: The GE SR750 includes a 5 Amp sensitive current input for additional protection. This channel enables restricted earth fault or sensitive ground fault functions.

• Input Channels: Five total current inputs provide comprehensive monitoring capability. These include three phases, one ground, and one sensitive input.

• Current Accuracy: The relay maintains ±2% accuracy across the full current range. This ensures reliable protection coordination and fault detection.

Power Supply and Control Power Options

The GE SR750 750-P5-G5-S5-HI-A20-R-E accepts a wide range of control power voltages for global application flexibility. Its universal power supply simplifies inventory and installation requirements.

• DC Voltage Range: The relay operates on 80 to 300 V DC control power. This wide range suits both nominal 110 V and 220 V DC station batteries.

• AC Voltage Range: It accepts 70 to 265 V AC at 48 or 62 Hz. Consequently, it works with standard station service voltages worldwide.

• Power Consumption: The relay consumes 25 Watts maximum during normal operation. This low burden minimizes stress on control power transformers.

• Frequency Compatibility: It operates at both 48 Hz and 62 Hz systems. Therefore, it suits international applications with varying frequencies.

• Hold-up Time: Internal capacitors provide 50 ms hold-up during power interruptions. This ensures continued operation through momentary voltage sags.

Analog Outputs and Communication Features

The GE SR750 750-P5-G5-S5-HI-A20-R-E includes extensive analog output capability for integration with SCADA systems. These outputs transmit real-time measurements to remote monitoring equipment.

• Analog Outputs: The relay features eight 4-20 mA analog output channels. Each channel transmits a programmable parameter such as current or power.

• Output Assignment: You can assign any measured value to any analog output channel. This flexibility accommodates various monitoring requirements.

• Output Accuracy: Analog outputs maintain ±1% accuracy across the full 4-20 mA range. Consequently, remote systems receive reliable measurement data.

• Communication Ports: Front and rear RS232 and RS485 ports support multiple protocols. These include Modbus RTU for easy integration with existing systems.

• Firmware: The relay includes HI firmware version with enhanced protection features. This ensures access to the latest functionality and improvements.

Protection Functions and Operational Features

The GE SR750 provides comprehensive protection functions for feeder applications. Its advanced algorithms ensure rapid fault clearing and selective coordination.

• Phase Overcurrent: Multiple time-current curves enable coordination with downstream devices. Independent phase and ground elements provide complete protection.

• Ground Fault Protection: Sensitive ground fault elements detect low-level ground faults. Zero sequence input ensures detection of all ground fault types.

• Breaker Control: The red breaker closed LED provides immediate visual status indication. Front panel controls enable local breaker operation during testing.

• Event Recording: Internal memory stores up to 1024 events with time stamping. This aids in post-fault analysis and system troubleshooting.

• Oscillography: The relay captures fault waveforms for detailed engineering analysis. These records help verify protection system performance.

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