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Multilin L60

Line Phase Comparison System

The L60 provides fast and secure sub-cycle phase comparison protection, for both two-terminal and three-terminal lines, lines with series compensation and for single-pole and three-pole tripping applications. The L60 can operate using existing power line carrier or fiber optic communications, and compensates for channel asymmetry and charging currents. The L60 can provide complete support of dual-breaker line terminals by using multiple current inputs.

Key Benefits

  • Extremely fast and secure phase comparison protection with a typical tripping time of ¾ power cycle

  • End-to-end communication over power line carrier provides cost-effective solution

  • Advanced IEC 61850 Ed. 1 and Ed. 2 certified implementation, complete settings via SCL files and IEC 61850-9-2 process bus solution ensures interoperability, device managing optimization and reduced cost of ownership

  • Routable GOOSE (R-GOOSE) enables GOOSE messages going beyond the substation, which enables wide area protection and control applications

  • Robust network security enabling Critical Infrastructure Protection through user command logging, and dual permission access control

  • Three-zone high-speed backup phase and ground distance function

  • Advanced fault and disturbance recording, including internal relay operating signals, eliminating the need for external recording devices

  • Application flexibility - multiple I/O options, programmable logic (FlexLogic™), modularity, customizable to specific requirements

  • Embedded IEC61850 protocol

  • Application flexibility with multiple I/O options including high density I/O, programmable logic, modularity, and specific customization

  • An integrated large, full color display, provides real-time visualization and control of the protected bay, via a bay mimic as well as annunciate functionality and graphical visualization of phasors


  • Short and long overhead lines and cables of different voltage levels

  • Suitable for two- and three-terminal lines

  • Circuits with tapped transformer feeders

  • Implicit direct transfer trip for breaker failure applications

Protection & Control

Key Features

  • Line current differential with adaptive restraint

  • Stub bus protection

  • Breaker failure

  • Three-pole autoreclose

  • Underfrequency protection

  • Phase directional overcurrent, neutral directional with dual polarity criteria, broken conductor and thermal overload

  • Non-directional overcurrent: phase, neutral and negative sequence

  • Phase over/under voltage, negative sequence overvoltage

  • Two independent synchronism check elements

The L60 is an advanced sub-cycle phase comparison relay intended for application on overhead transmission lines, including series-compensated lines, and underground cables of different voltage levels. Two and three-terminal lines can be protected easily by interfacing to new or existing power line carrier equipment. The L60 also has built-in interfaces to support communication channels of various types between line terminals. Part of the Universal Relay family, the L60 comes with a variety of versatile features, truly integrating protection, monitoring, metering, communication and control in one easy-to-use device. The Universal Relay family offers a high degree of modularity in its design and functionality, providing superior performance in protection and control, while meeting the toughest requirements of the marketplace.

Monitoring & Metering

Key Features

  • Breaker condition monitoring including breaker arcing current (I2t) and trip counter

  • Metering - current, voltage, power, energy and frequency

  • Oscillography - 64 samples/cycle, up to 64 records

  • Event Recorder - 1024 time tagged events, with 0.5ms scan of digital inputs

  • Data Logger- Up to 16 channels with user-selectable sampling rate

  • Fault Locator

Advanced Automation

The L60 incorporates advanced automation features including powerful FlexLogic™ programmable logic, communication, and SCADA capabilities that far surpass what is found in the average line differential relay. The L60 integrates seamlessly with other UR relays for complete system protection.


Key Features

  • Three independent 100Mbps Ethernet ports enable purpose specific LAN support that eliminates latency effect of heavy traffic protocols on mission critical communication services

  • Embedded IEEE 1588 time synch protocol support eliminates dedicated IRIG-B wiring requirements for IEDs

  • Direct I/O secures high-speed exchange of binary data between URs

  • Increase network availability by reducing failover time to zero through IEC62439-3 “PRP” support

Advanced Communications

The L60 provides for secure remote data and engineering access, making it easy and flexible to use and integrate into new and existing infrastructures. Fiber optic Ethernet provides high-bandwidth communications allowing for low-latency controls and high-speed file transfers of relay fault and event record information. The available three independent and redundant Ethernet options provide the means to create fault tolerant communication architectures in an easy, cost-effective manner. 

The L60 supports the most popular industry standard protocols enabling easy, direct integration into monitoring and SCADA systems.

  • IEC 61850 Ed. 1/Ed. 2 with 61850-9-2 (Process Bus) and 61850-90-5 (synchrophasors) support

  • DNP 3.0 (serial & TCP/IP)

  • IEC 60870-5-103 and IEC 60870-5-104

  • Modbus RTU, Modbus TCP/IP

  • HTTP, TFTP, SFTP and MMS file transfer

  • Redundant SNTP and IEEE 1588 for time synchronization

  • PRP as per IEC 62439-3

  • Supports Routable GOOSE (R-GOOSE)

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Functional Block Diagram

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The L60 is the single point for protection, control, metering, and monitoring in one integrated device that can easily be connected directly into DCS or SCADA monitoring and control systems.

L60 Brochure

L60 Manual

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