The GE Multilin 350 is a compact, high-performance protection relay designed for the protection and management of industrial and utility feeders. As part of the 350 series, this specific configuration (350-P1-G1-H-E-M-C-P1-E-DN) provides integrated overcurrent protection, monitoring, and control functions. It is engineered to simplify protection schemes while offering advanced communication capabilities for modern smart grid and industrial automation environments.
Model Configuration Breakdown (Ordering Code)
The long part number specifies the exact hardware and software options installed on this unit:
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350: Base Feeder Protection System.
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P1: Phase Current Inputs (1 A / 5 A universal).
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G1: Ground Current Input (1 A / 5 A universal).
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H: High Control Power (88–300 VDC, 85–265 VAC).
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E: Enhanced Display (Graphical LCD with backlit keypad).
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M: Measurement and Power Quality monitoring options.
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C: Standard Control functions (including Breaker Control).
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P1: Standard Protection Suite (Overcurrent, Voltage, Frequency).
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E: Ethernet Communication (10/100 Base-TX).
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DN: DeviceNet Protocol support (or specific regional/firmware designation).
Product Specifications (Datasheet)
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Model: 350-P1-G1-H-E-M-C-P1-E-DN
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Protection Functions: 50P/51P (Phase), 50G/51G (Ground), 50N/51N (Neutral), 46 (Negative Sequence), 27/59 (Voltage), 81U/O (Frequency).
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Metering: Current (A), Voltage (V), Power (kW, kVA, kVAR), Energy (kWh), Demand.
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Dimensions: 177 mm x 107 mm x 155 mm (H x W x D).
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Weight: 2.1 kg.
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Communication Protocols: Modbus RTU/TCP, DNP 3.0, IEC 61850 (optional), DeviceNet.
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I/O: Multi-programmable digital inputs and relay outputs.
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Sampling Rate: 64 samples per cycle for high-accuracy fault detection.
Key Application Fields
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Utility Distribution: Protecting radial and loop feeders in electrical substations.
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Industrial Plants: Safeguarding electrical distribution boards in manufacturing facilities and mines.
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Renewable Energy: Monitoring and protecting the point of common coupling (PCC) for solar and wind farms.
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Commercial Buildings: Main and branch circuit protection for large-scale data centers and hospitals.
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Motor Protection: Providing basic protection for large motors when dedicated motor protection is not utilized.
Product Usage Instructions
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Mounting: Install the 350 relay into a standard cutout on a switchgear panel. Ensure the mounting clamps are tightened to maintain a seal against dust and moisture.
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Wiring Current Transformers (CTs): Connect the secondary leads of your Phase and Ground CTs to the designated terminals. Ensure the polarity is correct for accurate directional protection and power metering.
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Power Connection: Apply control power within the “H” range (e.g., 110V AC or 125V DC). Ensure the unit is properly grounded via the dedicated ground lug.
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Configuration: Use the EnerVista 350 Setup software via the front USB port or rear Ethernet port to configure protection curves (ANSI/IEC), pickup levels, and time delays.
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Testing: Perform a secondary injection test using a relay test set to verify that the relay trips the circuit breaker within the specified time for various fault magnitudes.
Q&A: Frequently Asked Questions
Q: Can this relay be used for both 1A and 5A CT secondaries?
A: Yes. The “P1” and “G1” designations indicate universal current inputs that can be field-configured for either 1A or 5A secondary ratings.
Q: What is the benefit of the “Enhanced” (E) display?
A: The enhanced display provides a graphical view of phasors, metering data, and event logs directly on the relay faceplate, reducing the need for a laptop during routine inspections.
Q: Does this unit support “Cold Fast Load Pickup”?
A: Yes, the 350 series includes logic to prevent nuisance tripping during the inrush current associated with re-energizing a feeder after an outage.
Q: How do I retrieve fault records?
A: You can view the last 256 events and 32 oscillography records (comtrade format) through the EnerVista software or via the Ethernet web server interface.
Find the 350-P1-G1-H-E-M-C-P1-E-DN and other GE Multilin protection solutions to enhance your grid reliability and equipment safety.
Similar Model Recommendations
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GE Multilin 345: A similar protection relay focused specifically on basic feeder protection with fewer I/O options.
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GE Multilin 850: A high-end feeder protection system with advanced logic and dual-redundant Ethernet.
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SEL-751: A common industry alternative for feeder protection with similar logic and communication capabilities.
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GE Multilin SR350: The “Slim” version for applications with very limited panel space.
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GE Multilin 369: A specialized version of this platform designed specifically for Motor Protection.
