F-PRO
M-PRO
TESLA
ERMLG
L-PRO
T-PRO
B-PRO
S-PRO
L-PRO
Transmission Line Protection Relays
The L-PRO 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 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.
The L-PRO comes in two models with different builds to suit specific market requirements. Model 4000 is a 3U or 4U 19 inch rack model whereas model 4500 is in an E12 case size and has dual rated 1A and 5A CT inputs. Model 4500 also has optional PRP redundancy communications. The user software is common to the two models.
L-PRO 4500 Transmission Line Protection Relay
L-PRO 4000 Transmission Line Protection Relay
Key Features & Capabilities
Comprehensive distance and directional protection for medium to extra-high-voltage lines
Communication-based protection schemes (POTT, PUTT, DCB) for high-speed line clearing
4-shot autorecloser with dead line/dead bus control and sync check
Dynamic swing recording to capture and analyze power system instability
8 setting groups for adapting to different operating conditions
Dual Ethernet ports with unique MAC addresses for enhanced network security
Mutual coupling monitoring for multi-circuit line applications
Support for ring bus and breaker-and-a-half substation configurations
Applications
Primary and backup protection on transmission and sub-transmission lines (using pilot protection schemes)
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)
Ideal for multi-circuit line applications (to monitor mutual coupling via additional VT and CT inputs)
Backup protection for generators, transformers and reactors
IDEAL FOR Transmission system operators, regional grid companies, and utilities managing long-distance high-voltage transmission corridors that need fast fault clearance, stability monitoring, and advanced communication-based protection.