Distribution Feeder Protection

Multilin F35

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The F35, a member of the UR Family of protection relays, provides cost-effective feeder protection, control and metering for up to five feeders with busbar voltage measurement, or six feeders without busbar voltage in one integrated package. Use the F35 as a stand-alone device or as a component of an automated substation control system.

Key Benefits
  • Cost-effective and flexible protection and control device for distribution feeder applications

  • 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

  • High-end fault and disturbance recording, including internal relay operating signals

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

  • Simplified system integration with communications supporting serial and Ethernet interfaces and multiple protocols

  • Reduced relay-to-relay wiring and associated installation costs through high-speed inter-relay communications

  • Supports latest edition of waveform capture (COMTRADE 2013) simplifying fault records management

  • 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

  • Primary protection and control for multiple distribution feeders

  • Distribution load shedding schemes based on voltage and frequency elements

  • Busblocking/interlocking schemes

  • Throwover schemes (bus transfer scheme applications)

  • Distributed generation (DG) interconnect protection, including active and passive anti-islanding

Protection & Control

The F35 feeder protection system provides feeder protection, control, monitoring and metering in an integrated, economical, and compact package. As part of the Universal Relay (UR) Family, the F35 provides cost-effective solutions and features high performance protection, expandable I/O options, integrated monitoring and metering, high-speed communications, and extensive programming and configuration capabilities. The F35 can be configured to protect up to six feeders or protect up to five feeders when bus voltage measurement is required. It also provides fast and deterministic execution of programmable logic necessary for substation automation applications. Graphical programming tools (Viewpoint Engineer), supported by a library of logic components, make the F35 simple to use and configure.

A sensitive wattmetric zero-sequence directional function can be used on isolated or resonant (Petersen coil) grounded, low-resistance grounded and solidly grounded systems to detect ground faults. This function determines the presence and direction of ground faults by measuring the value and direction of zero-sequence power. This flexible element responds to power derived from zero-sequence voltage and current in a direction specified by the element characteristic angle. Power can be selected as active, reactive, or apparent. Therefore, the element may be used to sense either forward or reverse ground.

The F35 has a wide range of protection elements that have many years of proven field experience.

Functional Block Diagram