GE Multilin L90 Line Current Differential System

Overview

The General Electric Multilin L90 is an advanced, cost-effective relay for line current differential protection. It suits transmission lines and cables across various voltage levels.

Key Features

• High-Speed Protection: Provides rapid protection optimized for transmission lines and feeders.

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

• Synchronized Sampling: Reduces communication issues through synchronized sampling at each relay.

• Adaptive Restraint: Balances sensitivity for internal faults and security for external faults.

• Inter-Relay Communication: Enables effective communication via fiber and various interfaces.

Protection Capabilities

• Phase-Segregated Differential Protection: Ensures high-speed single-pole tripping.

• Phase and Ground Distance Protection: Offers high-speed protection across five zones with independent compensation.

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

• Synchrophasor Support: Integrates with Phasor Measurement Units, meeting IEEE C37.118 and IEC 61850 standards.

Communication and Connectivity

• Ethernet Ports: Three independent Ethernet ports for simultaneous connections.

• Time Synchronization: Achieves 1 microsecond synchronization via LAN with IEEE 1588 support.

• Cybersecurity: Features "CyberSentry™" for advanced security.

• IEC 61850 Compliance: Adheres to IEC 61850 standards, supporting flexible configurations.

Applications

• Versatile Use: Ideal for overhead and underground cables, including series-compensated lines.

• Three-Terminal Configurations: Supports three-terminal lines for improved system monitoring.

• Secure Application: Compatible with Capacitively-Coupled Voltage Transformers (CCVTs) for reliable performance.