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GE Multilin 750-P1-G1-S1-HI-A20-R Feeder Management Relay

The GE Multilin 750-P1-G1-S1-HI-A20-R, also cataloged as the 750-P1-G1-S1-HI-A20-R Feeder Management Relay, operates as a dedicated hardware component for feeder protection, current monitoring, and control execution within GE Multilin 750/760 feeder management platforms.

Hardware Specifications

Parameter	Specification
Model	750-P1-G1-S1-HI-A20-R
Brand	GE Multilin
Origin	General Electric Multilin
Weight	4.8 kg
Dimensions	17.8 cm x 22.9 cm x 17.8 cm
Operating Temp	-40 deg C to +60 deg C
Power Consumption	15 W / 35 VA nominal, 25 W / 45 VA maximum
Protection Inputs	1 A phase CT inputs, 1 A ground CT inputs, 1 A sensitive ground input
Control Power	88-300 VDC or 88-265 VAC, 45-66 Hz
Analog Outputs	Eight configurable 4-20 mA DC analog outputs
Communications	RS232 front port, RS485 rear ports, Modbus RTU support
Construction	Full drawout relay case for rack mounting or panel installation
Frequency Tracking	Automatic tracking from 20.0 Hz to 65.0 Hz

Deterministic Network and Firmware Compatibility

The GE Multilin 750-P1-G1-S1-HI-A20-R uses a microprocessor-based relay architecture with digital signal processing and programmable FlexLogic execution. The firmware environment supports configurable protection logic, event processing, waveform capture, and communication parameter management.

The relay integrates industrial control functions through RS232 and RS485 communication interfaces. Modbus RTU communication enables integration with supervisory systems for parameter access, metering retrieval, and relay status monitoring. The drawout construction supports controlled module replacement without disturbing fixed field wiring.

The hardware platform provides configurable I/O density scaling through eight 4-20 mA analog outputs assigned to measured electrical quantities including current, voltage, power, and frequency parameters.

Frequently Asked Questions

Q: Does the 750-P1-G1-S1-HI-A20-R support hot-swap module replacement?
A: The relay uses a drawout case design intended for maintenance access and module removal. Field replacement procedures must follow the applicable GE Multilin installation manual and system isolation requirements.

Q: What CT input ratings are supported by this relay configuration?
A: This model configuration uses 1 A secondary phase current inputs, 1 A ground current inputs, and a 1 A sensitive ground input.

Q: Which communication ports are available for system integration?
A: The relay provides a front RS232 setup port and rear RS485 communication ports supporting Modbus RTU protocol.

Field Installation Guidelines

• Install the relay in a suitable protective enclosure with sufficient clearance for the drawout mechanism and rear terminal access.
• Connect CT secondary wiring using dedicated twisted pairs and maintain correct polarity between current transformers and relay terminals.
• Apply shielded communication cables for RS232 and RS485 connections where required by site electromagnetic compatibility practices.
• Connect cable shields according to the equipment grounding design to minimize induced noise on measurement and communication circuits.
• Separate low-level analog signal wiring from high-voltage power conductors to reduce electromagnetic interference.
• Verify control power voltage range before energizing the relay.
• Confirm protection settings, CT ratios, output assignments, and communication parameters before placing the feeder protection system into service.

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