The L30 is a cost-effective line current differential protection relay intended for sub-transmission and medium voltage lines and cables providing reliable and secure operation even under the worst case power system conditions. The L30 provides secure high-speed fault detection and clearance suitable for three-pole tripping applications. The L30 supports inter-relay communications via direct fiber as well as standard RS422, G.703 and C37.94 telecommunication interfaces. The L30 also provides synchrophasor measurements over Ethernet per IEEE C37.118.

Key Benefits

• Proven current differential protection ensures secure high-speed tripping
• 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
• Increased sensitivity through dynamic charging current compensation and communication channel asymmetry compensation
• Adaptive restraint characteristic provides excellent security against measurement errors including CT saturation
• Phasor Measurement Unit (synchrophasor) according to IEEE® C37.118 (2011) and IEC® 61850-90-5 support
• 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

Applications

• Overhead lines and underground cables of different voltage levels
• Circuits with tapped transformer feeders
• Suitable for three-terminal line configurations, with channel redundancy and direct transfer tripping (DTT)
• Wide area system monitoring and control and using integrated protection and synchrophasor measurement
• Applications requiring three-pole autoreclosing and independent synchrocheck supervision