Description

GE Multilin 750-P5-G5-S5-HI-A20-G-E Feeder Management Relay

Configured for feeder protection, control, and monitoring in distribution protection networks, the GE Multilin 750-P5-G5-S5-HI-A20-G-E (750 Feeder Management Relay) provides direct physical/electrical execution of phase, ground, and sensitive ground fault processing with integrated control I/O and communication interfaces.

Hardware Specifications

Parameter	Specification
Model	750-P5-G5-S5-HI-A20-G-E
Brand	GE Multilin
Dimensions	Standard 1/2-drawout case; 19-inch rack mounting option
Operating Temp	-40 deg C to +60 deg C
Power Consumption	15 W typical, 25 W maximum
Power Supply	HI option: 88-300 VDC / 70-265 VAC operating range
Phase Current Inputs	5 A nominal CT input; 0.05 to 20 x CT operating range
Ground Current Input	5 A nominal CT input; 0.05 to 20 x CT operating range
Sensitive Ground Input	5 A nominal CT input
Voltage Inputs	50 V to 240 V phase-to-neutral VT input
Digital Inputs	14 configurable digital inputs with dry/wet contact support
Output Relays	8 output relays with Form-C and Form-A contacts
Analog Outputs	8 channels, 4-20 mA assignable outputs
Communication Ports	RS232 front port, RS485 rear port, optional Ethernet or Modbus TCP/IP
Display Interface	Graphical LCD display with keypad
Protection Functions	ANSI 50/51, 50N/51N, 50G/51G, 67/67N, 27/59, 81O/81U, 46, 79, BF

Deterministic Network and I/O Processing

The GE Multilin 750 platform uses microprocessor-based protection logic for feeder current analysis, trip output control, and status monitoring. The relay processes phase CT, ground CT, sensitive ground CT, and VT measurement channels with configurable protection elements including instantaneous overcurrent, time overcurrent, directional protection, voltage protection, frequency protection, automatic reclosing, and breaker failure functions.

The 750-P5-G5-S5-HI-A20-G-E configuration includes an A20 analog output package providing eight assignable 4-20 mA channels. Communication processing supports RS485 Modbus RTU connectivity with configurable data exchange for supervisory control systems.

Frequently Asked Questions

Q: Does the 750-P5-G5-S5-HI-A20-G-E support hot-swap replacement during operation?
A: The provided data does not specify hot-swap capability. Replacement procedures should follow the applicable GE Multilin installation and maintenance instructions with power isolation applied.

Q: What communication protocol is available through the rear communication port?
A: The relay provides an RS485 rear communication port supporting Modbus RTU protocol. Optional Ethernet and Modbus TCP/IP communication are available according to configuration.

Q: What current input withstand capability is specified for the CT channels?
A: The phase, ground, and sensitive ground CT inputs support 20 A continuous thermal withstand and 500 A for 1 second.

Field Installation Guidelines

• Install the relay in the specified 1/2-drawout case or compatible rack mounting arrangement.
• Verify CT polarity, phase sequence, and grounding before connecting protection current inputs.
• Route CT wiring separately from high-voltage power conductors to reduce induced electrical interference.
• Use shielded communication wiring for RS485 networks and connect cable shields according to site grounding practices.
• Confirm auxiliary power supply voltage matches the HI option operating range before energization.
• Configure digital inputs, output contacts, and protection settings according to the approved protection coordination scheme.
• Inspect terminal connections and enclosure grounding before placing the relay into service.

Specifications

• Brand: General Electric

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems