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Multilin D30

Line Distance Protection System

The D30 is a cost-effective distance protection system suitable for primary protection of sub-transmission lines and as a backup protection for HV, EHV lines, reactors and generators. The D30 provides five zones of phase and ground distance protection along with complete overcurrent and voltage protection functions intended for three-pole tripping applications. The D30 comes with versatile automation features using custom pilot schemes, which can be built.

Key Benefits

  • Cost effective, five zone quad or mho, phase and ground distance protection

  • 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

  • Programmable logic for building customized pilot schemes

  • Reduced relay-to-relay wiring and associated installation costs

  • Simplified teleprotection interfaces with direct I/O communications hardware

  • Robust network security enabling Critical Infrastructure Protection

  • Application flexibility

  • Ambient temperature monitoring

  • 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


  • Overhead sub-transmission lines and underground cables including series-compensated lines

  • Circuits requiring three-pole autoreclosing and independent synchrocheck supervision

  • Circuits with in-zone power transformers

  • Secure application with Capacitively-Coupled Voltage Transformers (CCVTs)

  • Backup protection for generators, transformers and reactors


D30 Brochure

D30 Manual

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