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Home > Grid Automation > Protection Relays > Line Protection > L60

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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 flexible process bus support (IEC 61850-9-2LE or IEC 61850-9-2 Hardfiber) 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
  • An integrated large, full color display, provides real-time visualization and control of the protected bay, via a bay mimic as well as annunciator 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
What's New
Protection & Control
Monitoring & Diagnostics
Software & Security
UR 1 integrated Platform across all 18 applications
Communications icon

New and Enhanced Communication Capabilities

  • Support switchable IEC 61850 Ed. 1 and Ed. 2 and redundant SNTP (FW 7.7x)
  • New UR front panel with integrated 7” color, graphical display - providing operators with enhanced situational awareness (FW 7.6x)
  • High density I/O module supporting up to 120 inputs or up to 72 contact outputs – eliminating the need for additional discrete devices (FW 7.6x)
Cyber security icon

Cyber Security - CyberSentry UR (FW v7.xx)

CyberSentryTM enables UR devices to deliver full cyber security features that help customers to comply with cyber security requirements (NERC CIP, IEEE 1686, IEC 62443, etc):

  • Secured firmware upgrade: FW file includes hash code that enables authentication prior to being used for upgrading UR Relay (FW 7.9x)
Oscillography icon

Extended Oscillography Records (FW v7.xx)

  • Increased number of digital and analog channels (FW 7.90)
  • Supports IEEE C37.111-1999/2013, IEC 60255-24 Ed 2.0 COMTRADE 2013 standard (FW v7.40)
  • Configurable events allow for records of up to 45s at 64 samples per cycle
Protection & Control icon

New and Enhanced Protection and Control Functionality

  • Expanded Bay Controller Capabilities – providing a one box solution (FW 7.6x)

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

Protection & Control

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.

Functional Block Diagram

L60 Block Diagram

ANSI® Device Numbers & Functions

Device Number Function
21G Phase Distance
21P Ground Distance
25 Synchrocheck
27P Phase Undervoltage
27X Auxiliary Undervoltage
32N Wattmetric Zero-Sequence Directional
49 Thermal Overload
50BF Breaker Failure
50DD Current Disturbance Detector
50G Ground Instantaneous Overcurrent
Device Number Function
50N Negative Sequence Instantaneous Overcurrent
50P Phase Instantaneous Overcurrent
50_2 Negative Sequence Instantaneous Overcurrent
51G Ground Time Overcurrent
51N Negative Sequence Time Overcurrent
51P Phase Time Overcurrent
51_2 Negative Sequence Time Overcurrent
52 AC Circuit Breaker
59N Neutral Overvoltage
Device Number Function
59P Phase Overvoltage
59X Negative Sequence Directional Overcurrent
67N Neutral Directional Overcurrent
67P Phase Directional Overcurrent
67_2 Negative Sequence Directional Overcurrent
68 Power Swing Blocking
78 Out-of-Step Tripping
79 Autoreclose
87PC Phase Comparison

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

Monitoring & Diagnostics

Monitoring & Diagnostics

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.

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.

FlexLogic™ diagram

FlexLogic™ allows for the customization of the L60 for custom protection, control and automation, allowing users to build line protection schemes and applications for their requirements.

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.

  • 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)
HardFiber diagram

Cyber Security - CyberSentry™ UR (FW v7.4xx)

CyberSentry enables UR devices to deliver full cyber security features that help customers to comply with NERC CIP and NITIR 7628 cyber security requirements through supporting the following core features:

Secure FW upgrade

UR FW files v7.9 and up now include a hash code that allows for authentication prior to being used for upgrading UR devices.

Password Complexity

Supporting up to 20 alpha- numeric or special characters, UR passwords exceed NERC CIP requirements for password complexity. Individual passwords per role are available.

AAA Server Support (Radius)

Enables integration with centrally managed authentication and accounting of all user activities and uses modern industry best practices and standards that meet and exceed NERC CIP requirements for authentication and password management.

Role Based Access Control (RBAC)

Efficiently administrate users and roles within UR devices. The new and advanced access functions allow users to configure up to five roles for up to eight configurable users with independent passwords. The standard “Remote Authentication Dial In User Service” (Radius) is used for authentication.

Event Recorder (Syslog for SEM)

Capture all cyber security related events within a SOE element (login, logout, invalid password attempts, remote/local access, user in session, settings change, FW update, etc), and then serve and classify data by security level using standard Syslog data format. This enables UR devices integration with established SEM (Security Event Management) systems.

EnerVista™ Software

The EnerVista™ suite is an industry-leading set of software programs that simplifies every aspect of using the L60 relay. The EnerVista™ suite provides all the tools to monitor the status of the protected asset, maintain the relay, and integrate information measured by the L60 into DCS or SCADA monitoring systems. Convenient COMTRADE and Sequence of Events viewers are an integral part of the UR setup software included with every UR relay, to carry out postmortem event analysis and ensure proper protection system operation. Learn More

Enervista Software