Product Description

Overview

The GE Multilin 750-P1-G1-S1-HI-A20-R is a high-performance digital relay engineered for comprehensive protection, monitoring, and control of medium-to-high voltage distribution feeders. Designed for utility and industrial environments, it combines advanced protection algorithms with precise metering, programmable logic, and robust communication capabilities to optimize feeder system reliability and efficiency.

Key Features

Advanced Protection Capabilities

• Phase, neutral, and ground overcurrent with instantaneous, time-delayed, and directional elements

• Voltage protection including under/over-voltage and phase sequence detection

• Frequency monitoring with under/over-frequency and rate-of-change-of-frequency (df/dt) functions

• Integrated bus protection for improved feeder coordination

Precision Monitoring and Metering

• Current, voltage, power (kW, kVA, kVAR), energy (kWh), and power factor measurement

• Total Harmonic Distortion (THD) analysis up to the 25th harmonic

• High-resolution waveform capture for fault analysis and diagnostics

Programmable Logic and Control

• FlexLogic™ programmable control for custom automation, interlocking, and auto-reclosing schemes

• Multiple digital inputs and relay outputs for breaker control and feedback integration

Communication and Connectivity

• Industry-standard protocols: Modbus RTU, Modbus TCP/IP, DNP 3.0

• RS232, RS485, RS422 ports with optional Ethernet for SCADA and DCS integration

Robust Hardware Design

• High-voltage control supply: 88–300 VDC or 70–265 VAC

• Drawout construction with self-diagnostic monitoring for fault detection

• Operates reliably in harsh environments with EMI protection and wide temperature tolerance

Technical Specifications

• Analog Input Conversion Range: 0–21 mA

• Display: 40-character alphanumeric LCD

• Dimensions: 7” W × 6.5” L × 8.5” H

• Weight: 7.9 kg

• Pollution Degree: II

• Simulation Function: Supported for system testing and validation

• Manual: 1601-0120-AE

Applications

• Primary protection for distribution feeders

• Backup protection for transformers and generators

• Automatic load shedding based on frequency or voltage

• Integrated feeder monitoring and system diagnostics

FAQ

Q: Can this relay be used in both utility and industrial networks?
A: Yes, it is designed for medium-to-high voltage feeders in utility substations and industrial plants.

Q: Does it support remote monitoring?
A: Yes, with Modbus RTU, Modbus TCP/IP, DNP 3.0 protocols, it integrates seamlessly with SCADA or DCS systems.

Q: Are waveform captures available for post-event analysis?
A: Yes, high-resolution oscillography captures fault events for detailed diagnostics.

Q: How does it differ from similar models in the 750 series?
A: Compared to standard 750 models, the 750-P1-G1-S1-HI-A20-R offers sensitive ground current detection, high-voltage supply support, enhanced analog outputs, and ruggedized hardware for demanding environments.