Multi-function Transmission Line Protection Relay Type By Easun Reyrolle Ltd.

L-PRO 4000 is a digital, microprocessor-based line distance protection system that provides comprehensive distance based line protection for medium to extra-high-voltage transmission lines. Apply the L-PRO 4000 system for high-speed distance and directional protection and complete control in multi-breaker applications typically found in ring or breaker-and-a-half substation arrangements.

Product Applications:
Primary and backup protection on transmission and sub-transmission lines (using pilot protection schemes)
Overhead lines and underground cables
Fully integrated breaker protection and control for 2 breakers
Single and multi breaker applications (i.e. ring-bus and breaker-and-a-half capability, including breaker failure and individual breaker monitoring requiring single pole/three-pole auto-reclosing)
Backup protection for generators, transformers and reactors