General Electric L90 Line Current Differential System

The General Electric Multilin L90 is a high-end, cost-effective line current differential protection relay designed for protecting transmission lines and cables across various voltage levels. It provides advanced protection, communication, and monitoring capabilities tailored for modern power systems.

Functionality

• High-Speed Protection: Delivers fast current differential protection suitable for transmission lines and feeders.

• Distance Protection: Supports full distance protection and dual-breaker applications for both single and three-pole tripping.

• Synchronized Sampling: Employs synchronized sampling at each relay to reduce the impact of communication channel problems.

• Adaptive Restraint: Balances fault sensitivity and security by adapting restraint settings during internal and external faults.

• Inter-Relay Communication: Enables protection communications via direct fiber optics and multiple interface options.

Protection Features

• Phase-Segregated Differential Protection: Provides secure, high-speed single-pole tripping.

• Phase and Ground Distance Protection: Offers high-speed protection with 5 zones and independent compensation settings for phase and ground.

• Sensitivity Enhancements: Improves sensitivity through dynamic charging current compensation and communication channel asymmetry compensation.

• Synchrophasor Support: Supports Phasor Measurement Unit (PMU) functions compliant with IEEE C37.118 (2011) and IEC 61850-90-5 standards.

Communication and Connectivity

• Ethernet Ports: Three independent fiber or copper Ethernet ports allow simultaneous or dedicated network connections.

• Time Synchronization: Provides 1-microsecond accuracy time sync over LAN with IEEE 1588 support.

• Cybersecurity: Features advanced cybersecurity protection with GE’s “CyberSentry™” suite for industry standards compliance.

• IEC 61850 Compliance: Certified implementation of IEC 61850 Editions 1 and 2, with flexible support for process bus applications.