GE Multilin 750-P5-G5-D5-HI-A20-R-E-H – 5A Phase CT Feeder Protection Relay

GE Multilin 750-P5-G5-D5-HI-A20-R-E-H – 5A Phase CT Feeder Protection Relay - Image 2

GE Multilin 750-P5-G5-D5-HI-A20-R-E-H – 5A Phase CT Feeder Protection Relay

Product Overview

The GE 750-P5-G5-D5-HI-A20-R-E-H is a microprocessor-based digital feeder management relay from GE Multilin’s 750/760 series, engineered for comprehensive protection, control, and monitoring of medium-voltage distribution feeders. As a member of the SR family, this 750-P5-G5-D5-HI-A20-R-E-H integrates advanced overcurrent protection with voltage, frequency, and arc flash detection capabilities into a single compact drawout case. The relay’s suffix code reveals its full-specification status: P5 indicates 5A phase current inputs, G5 denotes 5A ground current inputs, D5 confirms advanced protection with voltage and frequency functions, HI represents the wide-range control power supply, A20 provides eight isolated 4-20 mA analog outputs, R adds a red breaker-closed LED indicator, E includes an enhanced backlit LCD display, and H specifies conformal coating for harsh environments .

In practical deployment, the 750-P5-G5-D5-HI-A20-R-E-H serves as the primary protection and management device for critical distribution feeders in industrial plants, utility substations, and commercial facilities. The relay continuously monitors phase and ground currents, voltage inputs, and frequency parameters, executing protection algorithms with high precision to detect and isolate faults before they escalate. By consolidating protection, accurate built-in metering, and flexible communication into one unit, the 750-P5-G5-D5-HI-A20-R-E-H eliminates the need for separate auxiliary metering and interposing relay panels, reducing lifecycle costs while enhancing system reliability .

The 750-P5-G5-D5-HI-A20-R-E-H belongs to GE’s SR family of feeder protection relays, a platform renowned for its drawout construction that enables rapid replacement without disturbing field wiring. This design philosophy directly addresses the operational reality that protection relay failures, while infrequent, demand immediate resolution to maintain system integrity. The conformal coating option further extends the 750-P5-G5-D5-HI-A20-R-E-H’s service life in humid, chemically corrosive, or contaminated environments where standard electronic assemblies would experience accelerated degradation .

Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	750-P5-G5-D5-HI-A20-R-E-H
Manufacturer	GE Multilin (GE Vernova Grid Solutions)
Product Series	Multilin 750/760 Feeder Protection System / SR Family
Product Type	Digital Feeder Management Relay (Drawout)
Phase Current Inputs (P5)	5 A secondary
Ground Current Inputs (G5)	5 A secondary
Control Power (HI)	88–300 VDC; 70–265 VAC @ 48–62 Hz
Analog Outputs (A20)	Eight (8) isolated 4–20 mA, programmable
Display (E)	Enhanced backlit LCD with improved keypad
Communication Protocols	Modbus RTU, DNP 3.0 Level 2
Event Recording	512 time-tagged events
Oscillography	Up to 32 power cycles (10 records)
Operating Temperature	–40°C to +60°C
Net Weight	Approximately 7.6 kg

Main Features and Advantages

Comprehensive Protection Suite: The 750-P5-G5-D5-HI-A20-R-E-H integrates an extensive library of ANSI protection elements within a single hardware platform. Phase, neutral, and ground instantaneous and time-overcurrent elements form the foundation of the protection scheme, while the D5 advanced protection package adds voltage protection, frequency protection, synchrocheck, and arc flash detection capabilities . This consolidation means a single 750-P5-G5-D5-HI-A20-R-E-H can replace what previously required multiple discrete relays, reducing wiring complexity and panel space requirements.

Drawout Construction for Minimal Downtime: The 750-P5-G5-D5-HI-A20-R-E-H features a drawout case design that allows the relay chassis to be removed from its housing without disconnecting field wiring. This architecture is particularly valuable in critical distribution applications where protection must be restored rapidly following a device failure or firmware upgrade. Maintenance personnel can simply slide out the affected 750-P5-G5-D5-HI-A20-R-E-H and insert a replacement unit, with all current transformer, voltage transformer, control power, and communication connections remaining undisturbed .

Precision Built-in Metering: The 750-P5-G5-D5-HI-A20-R-E-H provides high-accuracy metering of voltage, current, power, power factor, and harmonics, eliminating the need for separate panel meters or transducer installations. Eight programmable 4-20 mA analog outputs allow critical measured parameters to be transmitted directly to SCADA systems, PLCs, or distributed control systems without additional signal conditioning equipment. This metering capability also supports power quality analysis, enabling operators to identify harmonic distortion, voltage unbalance, or load imbalance issues before they cause equipment damage .

Harsh Environment Protection: The H suffix indicates that the has received conformal coating on its circuit boards, protecting sensitive electronics from humidity, chemical vapors, and conductive dust. This protection is particularly important in industrial environments such as chemical plants, wastewater treatment facilities, and coastal installations where atmospheric contamination can rapidly degrade unprotected circuit assemblies .

Wide-Range Control Power: The HI control power option accepts 88-300 VDC or 70-265 VAC at 48-62 Hz, enabling the to operate directly from common station battery voltages including 110 VDC, 220 VDC, and 250 VDC without requiring external power supplies or voltage converters. This flexibility simplifies installation and reduces the number of spare components required in inventory .