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GE MULTILIN 750/760 Feeder protection system
Source: | Author:kongjiang | Published time: 2026-09-17 | 32 Views | 🔊 Click to read aloud ❚❚ ▶ | Share:
The 750/760 Feeder Protection System is a digital relay intended for the management and primary protection and control of distribution feeders. This easy-to-use relay provides comprehensive protection functions for feeders and backup protection for buses, transformers, and transmission lines in a draw-out construction and at a reduced product life cycle cost.

GE MULTILIN 750/760 Feeder protection system
Feeder protection system
The 750/760 Feeder Protection System is a digital relay intended for the management and primary protection and control of distribution feeders. This easy-to-use relay provides comprehensive protection functions for feeders and backup protection for buses, transformers, and transmission lines in a draw-out construction and at a reduced product life cycle cost.
Key Benefits
• Easy-to-use Feeder Protection System supported by an industry-leading suite of software tools
• Accurate built-in metering functions - Eliminates auxiliary metering devices and reduces cost
• Improve uptime of auxiliary equipment - I/O monitoring
• Reduce troubleshooting time and maintenance costs - IRIG-B time synchronization, event reports, waveform capture, data logger
• Minimize replacement time - Draw-out construction
• Simplify testing - Built-in simulation features
• Cost-effective access to information. Supports industry protocols such as DNP & Modbus. Includes an optional 10MB Ethernet port for system integration
• Complete asset monitoring - Analog I/O, Full metering including demand & energy
• Leading-edge technology - Flash memory for product field upgrade
• Extended life - Optional conformal coating for chemically corrosive and humid environments
• Globally accepted, ensuring adherence to international codes and standards
Applications
• Primary protection and control for distribution feeders on solidly grounded, high impedance grounded or resonant (Peterson Coil) grounded systems
• Bus blocking/Interlocking schemes
• High-speed fault detection for arc flash mitigation
• Throw-over schemes (bus transfer scheme applications)
• Load shedding schemes based on voltage and frequency elements
• Back-up protection for transmission lines, feeders and transformers
• Distributed Generation (DG) interconnect protection
Protection and Control
• Directional time, instantaneous phase & ground overcurrent protection
• Directional sensitive ground and Restricted Earth Fault protection
• Reverse power protection
• Synchro Check - V, f, Hz, & dead-source
• Automatic bus transfer or manual control
• 4-shot recloser (760 only)
Communications
• Networking interfaces - 10Mbps Ethernet, RS232, RS485, and RS422 ports
• Ethernet port, 10Mbps
• Multiple protocols - Modbus™ RTU, TCP/ IP, DNP 3.0 Level 2
Monitoring & Metering
• Metering-current, voltage, sequence components, power, energy, voltage
• Breaker operation & trip failure
• Total breaker arcing current
• Ambient temperature/analog transducer input
• Oscillography & Data Logger - 10 records up to 32 power cycles
• Simulation mode and playback capability
EnerVista Software
• State-of-the-art software for configuration and commissioning Multilin products
• Document and software archiving toolset to ensure reference material and device utilities are up-to-date • EnerVistaTM Integrator providing easy integration of data in the 750/760 into new or existing monitoring and control systems.
Protection and Control
The 750/760 Feeder Protection System is a digital relay for managing and providing primary protection and control of distribution feeders. This easy-to-use relay provides comprehensive protection functions for feeders and backup protection for buses, transformers, and transmission lines at a reduced product life cycle cost.
Time & Instantaneous Overcurrent
The 750/760 has two phase TOC elements with level detectors for each phase. The 750/760 also has two overcurrent elements, most commonly used for primary and backup protection. Each TOC element has the following programmable characteristics:
• Pickup current level for trip, alarm, or control
• Choice of 15 curve shapes (including FlexCurves) and curve multipliers
• Instantaneous or linear reset time characteristic
• Voltage restraint
The 750/760 has two-phase IOC elements with level detectors for each phase. Each IOC element has a programmable pickup current, a time delay during which current must exceed the pickup for operation, and the minimum number of phases required for operation.
Ground overcurrent protection
Solidly grounded and low impedance grounded distribution systems requiring fast clearing of ground faults to limit equipment damage. The following functions are incorporated in the 750/760 to provide ground fault protection.
• Neutral IOC and TOC
• Ground IOC and TOC
750/760 allows directional elements to be used to supervise the ground overcurrent protection elements. This means the 750/760 can be used to provide sensitive tripping for faults in one direction. Typical applications for directional overcurrent include:
• Isolation of the faulted feeder in ring bus or parallel feeder arrangements.
• Prevention of back-feeding utility source faults from industrial plant generators
• Sensitive high-speed ground protection of transformers
Sensitive ground and Restricted Earth Fault (REF) protection
Sensitive ground and RGF protection features provide sensitive detection of ground faults. Sensitive ground fault protection includes:
• Instantaneous (50N) & Time (51N) - 2 levels
• Directional supervision allows discrimination between forward and reverse faults.
• Dual polarization (current & voltage) provides max security and reliability
750/760 is employed to provide transformer backup protection (grounded wye windings and autotransformers) using the RGF feature.
Voltage Protection
Overvoltage/Undervoltage protection features can cause a trip or generate an alarm when the voltage exceeds a specified voltage setting for a specified time. Voltage protection includes a negative sequence voltage element to detect abnormal system unbalance conditions, and a neutral displacement voltage element using the calculated zero sequence voltage (3V0) to detect ground faults.
Frequency Protection
750/760 provides functionality to improve network (grid) stability using voltage- or frequency-based techniques. Also allows providing backup protection and tripping breakers directly when protecting generators and other frequency-sensitive power equipment.
• 2 Under-frequency elements (81U)
• 2 Over-frequency elements (81O)
• Frequency decay: 4 df/dt elements (59/81)
• 2 Undervoltage elements
Reverse power detection

750/760 relay allows tripping or alarm when power flows against the intended direction. In systems having in-plant generation parallel to the utility supply, detection of power flow toward the utility is necessary. For such applications, 750/760 eliminates the requirement for a separate device to detect power flow direction and reduces overall cost. This feature can also be used to detect motoring power into the generator.

750-P5-G5-D5-HI-A20-R-E-H
750
5A phase/zero sequence current, D5 third current channel, wide voltage power supply, 8 channels of 4-20mA output, enhanced LCD, three-proof coating.
750-P5-G5-S5-HI-A20-R-E
750
5A phase/zero sequence/sensitive grounding current, wide voltage power supply, 8 channels of 4-20mA output, enhanced LCD.
750-P5-G5-S5-HI-A20-R-T
750
5A phase/zero sequence/sensitive grounding current, wide voltage power supply, 8 channels of 4-20mA output, including Ethernet port (T).
750-P5-G5-S5-HI-A20-R
750
5A phase/zero sequence/sensitive grounding current, wide voltage power supply, 8 channels of 4-20mA output, red circuit breaker LED.
750-P1-G1-S1-HI-A20-R-E
750
1A phase/zero sequence/sensitive grounding current, wide voltage power supply, 8 channels of 4-20mA output, enhanced LCD.
760-P5-G5-S5-HI-A20-R-E
760
Including reclosing function (exclusive to 760), 5A current input, wide voltage power supply and enhanced LCD.
760-P5-G5-S5-HI-A20-G-E
760
Including reclosing, 5A current input, green circuit breaker LED(G), enhanced LCD.