750-P5-G5-S5-HI-A20-R-E-H GE Multilin 750 Series Feeder Protection

Product Overview

The GE Multilin 750-P5-G5-S5-HI-A20-R-E-H is a sophisticated, microprocessor-based feeder management relay engineered for the comprehensive protection, control, and monitoring of distribution feeders. This unit integrates multi-functional protection logic with advanced communications to ensure the stability and reliability of electrical power systems.

High-Performance Dual-Processor Logic

To achieve rapid signal processing and precise decision-making, the 750 series utilizes a dual-processor architecture. This system combines a 32-bit Motorola 68332 processor with a 16-bit Intel 80C186 co-processor. This hardware synergy allows the relay to perform complex protection algorithms and high-speed data sampling simultaneously without compromising system response times.

Versatile Protection and Power Management

This specific configuration provides both primary and backup protection for critical infrastructure including buses, transformers, and transmission lines. The HI power supply module supports a broad operational range, accepting 88–300 VDC or 70–265 VAC at 48–62 Hz. Current sensing is handled through dedicated 5 A inputs for phase, zero-sequence, and sensitive ground detection, enabling the relay to identify even minor fault conditions accurately.

Control Hub and Interface Features

Beyond simple protection, the A20 option integrates eight 4–20 mA analog outputs, which allows the relay to function as a centralized control hub for external industrial equipment. The front panel features an enhanced user interface with high-visibility LED indicators, including a dedicated “Breaker Closed” status light. These features ensure that operators can verify system states and execute real-time adjustments effectively.

Mechanical Integrity and Installation

The relay utilizes a robust drawout design that simplifies maintenance and testing procedures. The external case acts as a protective housing for the internal circuitry while providing permanent, secure connection points for field wiring. Because the SR series supports modular mounting, technicians can install this unit alongside other compatible relays in a standard 19-inch rack, provided they maintain the required door clearance.

Technical Specifications