Transmission Protection

Multilin L60

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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

  • 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 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

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