Description

GE / Alstom Multilin L30 Relay Line Current Differential System

GE Multilin L30 Relay 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.

GE Multilin L30 Relay 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

We offer GE’s century long tradition of power system innovation. From generators to transmission lines, to motors and beyond, we ensure dependable, safe power worldwide. GE offers a wide range of single function and auxiliary relays, along with a portfolio of accessories, to support high performing and reliable protection and control systems. Explore GE numerical Relays portfolio with us!