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
Protection & Control
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. Part of the Universal Relay family, the L30 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
