GE 750-P5-G1-S1-HI-A20-R Feeder Management Relay

The GE Multilin 750-P5-G1-S1-HI-A20-R, also cataloged as the 750-P5-G1-S1-HI-A20-R Feeder Management Relay, serves as the primary 750 Feeder Management Relay utilized to execute comprehensive monitoring, circuit breaker control, and automated fault isolation across medium-to-large utility and industrial power distribution networks.

Suffix Breakdown & Model Matrix

The 750 series utilizes explicit alphanumeric codes within its ordering matrix to define the integrated hardware options and functionality block baseline:

• 750: Core basic unit designator for the Feeder Management Relay series.
• P5: 5 A phase current secondary inputs equipped for standard CT interfacing.
• G1: 1 A zero sequence current inputs paired with sensitive ground current detection hardware.
• S1: Standard enhanced feature set package enabled.
• HI: High-voltage universal control power supply block (88-300 VDC / 70-265 VAC).
• A20: Advanced analog I/O configuration containing eight 4 to 20 mA analog outputs.
• R: Enhanced red breaker closed status LED indicators installed on the front faceplate.

Hardware Specifications

Industrial Control & Power System Specifications

• Backplane Bus Communication Velocity and Density Scaling The relay captures detailed network waveforms through a dedicated multi-channel processing architecture. It updates internal telemetry registers with data from 4 currents, 3 voltages, 14 logic input states, and 8 output relays simultaneously, ensuring instantaneous transmission over the serial communication link to upstream PLCs or SCADA platforms without causing data bottlenecks.
• Deterministic Protection Simulation and Trace Memory Execution The hardware features an isolated internal self-assessment and process simulation engine. This system allows technicians to test protection algorithms and map virtual faults directly to Trace Memory without applying external primary AC injection sources, ensuring mathematically pure variable generation for verifying custom logic setpoints.

Frequently Asked Questions

Q: What specific assignments are pre-mapped to the three dedicated electromechanical output relays?

A: The three dedicated channels are hardwired for safety-critical operations: Trip Relay 1 executes rapid circuit breaker opening, Close Relay 2 manages breaker closure sequence timing, and the Self-Test Warning relay handles internal diagnostic fault signaling. The remaining five output contacts are fully user-programmable for auxiliary alerting or custom interlock logic.

Q: How do the rear-mounted logic contact inputs handle mixed field excitation voltages?

A: The 14 rear contact inputs are designed with high-dielectric optical isolation blocks that accept both dry (voltage-free contact closure) and wet (externally energized) signaling configurations. This dual-mode layout allows seamless integration with legacy control switches and modern digital breaker status contacts across the switchgear lineup.

Field Installation Guidelines

• Chassis Alignment, Drawout Seating, and Enclosure Mounting Mount the relay vertically within a standard switchgear panel cutout. Slide the drawout chassis straight into its designated outer enclosure casing until the heavy-duty rear terminal blocks align and lock into place, verifying that the front faceplate seal is firmly compressed against dust ingress.
• Signal Routing, Trace Grounding, and Analog Shield Shielding Route all low-voltage 4 to 20 mA analog output circuits and discrete logic signal lines through separate grounded steel conduits away from high-power current transformer (CT) and voltage transformer (VT) secondary leads. Bond all control cable shields to the local protective earth grounding bar at a single point to eliminate induced electrical noise or signal distortion.