GE Vernova Multilin 750 Feeder Management Relay is a digital system intended for the comprehensive management, primary protection, and control of distribution feeders. Designed without automatic recloser functionality to distinguish it from the 760 series, this relay provides robust backup protection for buses, transformers, and transmission lines within a convenient draw-out construction. Equipped with full metering capabilities and analog input/output options, it ensures high asset visibility and integrates into monitoring and control infrastructures.

Description

The GE Multilin 750-P5-G5-HI-A20-R is an industrialized protection system tailored for distribution feeders on solidly grounded, high-impedance grounded, or resonant grounded networks. The unit features dedicated 5 A phase current inputs and 5 A zero-sequence ground current inputs to accommodate specific fault detection profiles. Operating under a wide high-voltage control power range, the relay incorporates an independent eight-channel 4 to 20 mA analog output array alongside a front-panel red breaker closed LED indicator. By utilizing standard industrial protocols and options for serial and Ethernet physical layers, the Multilin 750 executes fast fault processing, interlocking, and status reporting to optimize substation automation and protect upstream transformers and distribution buses.

Features

• Complete protection suite containing phase, neutral, ground, and negative sequence instantaneous and time overcurrent elements.
• Comprehensive ground protection capabilities via 5 A zero-sequence ground current inputs paired with neutral and ground overcurrent diagnostics.
• High-voltage universal power supply options supporting both AC and DC industrial stations.
• Integrated analog output hardware supplying eight independent 4 to 20 mA channels for remote PLC or SCADA tracking.
• Standard front panel red LED indicator for distinct local breaker closed status confirmation.
• Draw-out construction type enabling quick chassis maintenance and minimized replacement downtime.
• Built-in diagnostic testing system featuring simulation modes to preview fault, pre-fault, and post-fault characteristics.

Applications

• Primary protection and control for distribution feeders on solidly grounded, high-impedance grounded, or resonant (Peterson Coil) systems.
• Bus blocking and interlocking protection coordination schemes.
• High-speed fault detection for arc flash mitigation.
• Voltage and frequency element-based automatic load shedding schemes.
• Backup protection for transmission lines, feeders, distribution buses, and power transformers.

Ordering Information

Technical Specifications

Installation Guidelines

• Mounting: Ensure proper panel mounting alignment matching standard draw-out dimensions. Keep clearance optimized for ventilation.
• Grounding: Establish a dedicated low-impedance ground connection at the chassis ground terminal before making any current transformer or control power connections.
• CT Wiring: Verify secure insertion into the automatic shorting terminals. Phase and ground inputs must match the specified 5 A primary or secondary CT ratios to prevent overcurrent saturation or measurement inaccuracies.
• Control Power Protection: Route lines through an external fuse or circuit breaker matching the HI voltage limits (88 to 300 VDC or 70 to 265 VAC) to avoid power circuit component failure.
• Shielding: Ground the communication line shields at the PLC or computer side only to prevent ground loop interference.