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Multilin L90
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Grid Solutions Multilin L90 Line Protection System with Segregated Line Current Differential and Distance Protection The MultilinTM L90 is a high-end line current differential protection relay intended for transmission lines and cables of different voltages levels, providing reliable and secure operation even under the worst case power system conditions. The L90 provides high-speed phase-segregated fault clearance, suitable for single and three-pole tripping applications. Part of the Universal Relay (UR) family, the Multilin L90 comes with a variety of versatile features, truly integrating protection, monitoring, metering, communication and control in one easy-to-use device. Key Benefits • Standardized and comprehensive line protection device with high-speed phase segregated differential protection and charging current compensation, 5 zones for phase & ground distance protection(6zones and sub-cycle performance available) with customizable pilot schemes ensuring high-speed single-pole tripping • In-zone power transformer enables savings on CTs and protection device requirements • Embedded Synchrophasor measurement capabilities (per IEEE C37.118), eliminating the need for dedicated PMUs and support for synchrophasor multi-cast (per IEC® 61850-90-5) reducing bandwidth and communications infrastructure costs ® • 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 • Advanced IEC 61850 Ed. 1 and Ed. 2 certified implementation, complete settings via SCL files and comprehensive process bus support (IEC 61850-9-2LE or IEC 61869 or IEC 61850-9-2 Hardfiber) ensures interoperability, device managing optimization and reduced cost of ownership • Routable GOOSE (R-GOOSE) enables customer to send GOOSE messages beyond the substation, which enables WAPC and more cost effective communication architectures for wide area applications • Supports IEEE C37.111-1999/2013, IEC 60255-24 Ed 2.0 COMTRADE standard Applications • Overhead lines including series compensated lines and underground cables of different voltage levels • Circuits with tapped transformer feeders Protection and Control • Phase segregated line current differential with adaptive restraint, ground differential, in-zone transformer and stub bus protection • Phase & ground distance (5-zones) with independent compensation settings. 6-zones and sub-cycle performance available • Protection and control functionality in one box, reducing the number of devices • High density inputs/outputs to support the control of many switchyard assets – all from one powerful device • Integrated large, full color display, for real-time visualization and control of the protected bay Advanced Communications • 3 independent Ethernet ports for simultaneous & dedicated network connections with IEEE 1588 support • IEC 61850-9-2LE/IEC 61869 networked or IEC61850-9-2 Hardfiber process bus support • Wide range of supported protocols: IEC 61850 Ed. 2, SFTP, MMS File Transfer Service, DNP 3.0, Modbus Serial/TCP, IEEE 1588, IEC 60870‑5‑104 and 103, PRP, SNTP, HTTP, TFTP • Increased network availability by reducing failover time to zero through IEC 62439-3 PRP Support Cyber Security • CyberSentry™ provides high-end cyber security aligned to industry standards and services (NERC® CIP, AAA, Radius, RBAC, Syslog) • Suitable for three-terminal lines with channel redundancy and Direct Transfer Tripping (DTT) • Single and dual-breaker circuits requiring single/three-pole autoreclosing and independent synchrocheck supervision • Secure application with Capacitively-Coupled Voltage Transformers (CCVTs) • Ground isolated and peterson-coil systems Monitoring & Metering • Multi-ended fault location consistently providing 2% accuracy • Advanced recording with hi

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L90 Line Differential System L90 - Protection, Metering, Monitoring and Control The Multilin L90 Line Protection System offers a high degree of modularity in its design and functionality, providing superior performance while meeting the toughest requirements of the marketplace. Advanced protection and control features of this relay includes: Segregated Current Differential Protection The L90 is a phase-segregated current differential protection relay, which uses superior and patented algorithms to address the challenges of bandwidth, security, dependability and sensitivity in current...

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L90 Line Differential System The L90 innovative dual-slope-adaptiverestraint characteristic, based on estimates of measurement errors, allows the relay to be secure on severe external faults while maintaining sensitivity for internal faults. The estimate of errors in the input currents permits more sensitive settings than those used in the traditional percent differential schemes. The line differential element also has 2nd harmonic inrush-current inhibit for in-zone power transformer protection. This functionality enables the L90 to protect 2 or 3-terminal lines that have a power...

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L90 Line Differential System transformers or tapped transformer feeders, and overhead lines with series compensation. Each zone element for the phase and ground distance can be independently set as quad or mho characteristics with the flexibility of designing different characteristic shapes to suit different power system conditions. The advanced comparator-based distance elements provide the utmost security, sensitivity and selectivity for different types of faults. Superior digital filtering techniques provide secure and optimum reach accuracy even under worst-case CCVT transients. Secure...

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L90 Line Differential System Synchronism Check Topologies: PRP Start Hot-Stanby The L90 provides ten synchrocheck elements that monitor voltage difference, phase angle difference and slip frequency taking the CB closing time into account to ensure proper breaker closure as per user requirements. Any of the ten synchrocheck elements can be dynamically blocked or unblocked by other elements or user logic. The L90 also provides additional enhancements in synchronizing by allowing synchrocheck verification between local and remote line terminal voltages. Integrated Station and Process bus...

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Multilin L90
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