GE Multilin 350-E-P5-G5-H-E-E-N-M-1E-D-N

Product Overview

The GE Multilin 350-E-P5-G5-H-E-E-N-M-1E-D-N Feeder Protection Relay is an advanced microprocessor-based protection and control device designed for medium and low-voltage power distribution systems. As part of the GE Multilin 350 Feeder Management System, this relay provides comprehensive feeder monitoring, protection, measurement, and communication functions for industrial power networks.

Engineered for reliable operation in demanding electrical environments, the 350 series relay integrates overcurrent protection, ground fault protection, control logic, event recording, and communication capabilities into a compact draw-out design. It helps utilities and industrial facilities improve power system reliability, minimize downtime, and protect critical electrical assets from abnormal operating conditions.

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Protection Functions and Operating Principle

The GE Multilin 350-E-P5-G5-H-E-E-N-M-1E-D-N continuously monitors electrical parameters from feeder circuits and evaluates them against configured protection settings. When an abnormal condition is detected, such as excessive current, short circuit, or ground fault, the relay quickly issues a trip command to isolate the affected section of the electrical network.

The relay receives current signals from three-phase current transformers and ground current inputs, processes the measured values through its internal protection algorithms, and activates programmable output contacts when predefined protection thresholds are exceeded.

Typical protection functions include:

• Phase overcurrent protection
• Ground fault protection
• Instantaneous and time-delayed trip protection
• Feeder fault monitoring
• Breaker control and status supervision
• Event and alarm recording

This combination makes the relay suitable for applications requiring fast fault response and continuous feeder condition monitoring.

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Key Features

Comprehensive Feeder Protection

The GE Multilin 350 relay provides integrated protection functions specifically designed for feeder applications. It helps prevent equipment damage caused by electrical faults while maintaining selective coordination with upstream and downstream protection devices.

High-Accuracy Current Measurement

The model configuration includes 5 A phase current inputs and 5 A ground current input, allowing direct connection with standard industrial current transformers for accurate feeder monitoring.

Advanced Communication Capability

The relay supports industrial communication networks for integration with SCADA systems and plant automation platforms. Depending on configuration, communication options include serial communication and Ethernet-based protocols such as Modbus and DNP3.

Draw-Out Construction

The draw-out case design allows easier maintenance and replacement, reducing service interruption during inspection or equipment upgrades.

Event Recording and Diagnostics

Built-in monitoring functions record operational events, alarms, and fault conditions, helping engineers analyze system performance and improve troubleshooting efficiency.

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Technical Specifications

Parameter	Specification
Manufacturer	GE / GE Multilin
Model	350-E-P5-G5-H-E-E-N-M-1E-D-N
Product Type	Feeder Protection Relay
Product Family	Multilin 350 Feeder Management System
Protection Application	Distribution feeder protection
Phase Current Input	5 A, 3-phase CT input
Ground Current Input	5 A ground CT input
Power Supply	125–250 V DC / 120–240 V AC
Frequency	50/60 Hz
Communication Interface	Serial/Ethernet communication options
Mounting Style	Panel-mounted draw-out case
Display	Front-panel LCD interface
Programming Software	EnerVista SR3 Setup
Protection Functions	Overcurrent, ground fault, feeder monitoring
Operating Environment	Industrial power distribution applications

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Hardware Structure and Main Components

The GE Multilin 350 feeder relay features a modular structure designed for convenient installation and long-term industrial operation.

1. Front Display and Control Interface

The front panel provides a user interface for:

• Viewing measurements
• Checking alarms
• Reviewing relay status
• Adjusting configuration settings
• Performing local diagnostics

The LCD display allows operators to access important feeder information without requiring external equipment.

2. Protection Processing Unit

The internal microprocessor performs real-time calculations of current values, protection logic evaluation, event recording, and communication management.

This processing architecture provides fast response times and accurate fault identification.

3. Input and Output Interface

The relay includes:

• Current transformer inputs
• Digital inputs for external control signals
• Configurable relay outputs for trip and alarm functions

These interfaces allow connection with breakers, protection circuits, and automation systems.

4. Communication Interface

The communication section enables integration with supervisory systems for remote monitoring, configuration, and data collection.

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Application Areas

The GE Multilin 350-E-P5-G5-H-E-E-N-M-1E-D-N is widely used in electrical distribution systems, including:

Industrial Power Systems

Used for protecting factory distribution feeders, motors, and critical electrical equipment.

Utility Distribution Networks

Provides feeder protection and monitoring functions for electrical substations and distribution systems.

Oil and Gas Facilities

Supports reliable protection of electrical infrastructure in harsh industrial environments.

Petrochemical Plants

Helps maintain safe and stable operation of power distribution equipment.

Mining and Heavy Industry

Provides protection for high-load electrical networks requiring dependable fault isolation.

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Installation Requirements

Before installing the GE Multilin 350 relay, ensure the following:

• Confirm the relay configuration matches the feeder protection requirements.
• Verify CT ratios and wiring connections.
• Check auxiliary power supply compatibility.
• Install the relay securely in the protection panel.
• Configure protection settings according to the electrical system design.

During commissioning, engineers should perform:

• Input signal verification
• Trip output testing
• Communication testing
• Protection function validation

Proper configuration ensures reliable protection performance.

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Maintenance and Troubleshooting

The GE Multilin 350 relay is designed for long service life with minimal maintenance requirements. Recommended maintenance procedures include:

• Inspect relay status indicators regularly.
• Review recorded events after protection trips.
• Check communication performance.
• Verify terminal connections.
• Test protection functions periodically.
• Maintain a clean and controlled panel environment.

Diagnostic records help engineers quickly identify whether faults originate from the feeder system, wiring, communication network, or relay configuration.

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Performance Advantages

The GE Multilin 350-E-P5-G5-H-E-E-N-M-1E-D-N provides several operational benefits:

• Reliable feeder fault protection
• Fast response to abnormal electrical conditions
• Accurate current monitoring
• Flexible communication integration
• Easy maintenance through draw-out design
• Reduced equipment downtime
• Improved electrical system safety

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Product Summary

The GE Multilin 350-E-P5-G5-H-E-E-N-M-1E-D-N Feeder Protection Relay is a powerful solution for protecting and managing electrical distribution feeders. Combining advanced protection algorithms, accurate current measurement, communication flexibility, and diagnostic capabilities, it provides reliable protection for industrial and utility power systems.