Clearing faults fast reduces arc-flash hazards, potential for fire, and exposure to downed conductors. Fast fault clearing also reduces equipment damage and improves power quality.
Automatic service restoration improves reliability and continuity of service to critical loads.
Today, there’s no reason to wait to clear a fault.
Implement these tips to make your distribution systems safer, more reliable, and more economical:
Trip and restore distribution systems at transmission speeds using fiber or radio communications, Mirrored Bits communications, and your SEL relays.
Make your system safer by accelerating tripping, using fast bus tripping, getting fast faulted section notifications, and blocking reclosing for safety-related operating conditions—all made possible with the SEL-FT50 and SEL-FR12 Fault Transmitter and Receiver System and Mirrored Bits communications.
Get faster, safer, and better-coordinated protection when there’s distributed generation by putting directional, distance, and sync-check elements to work.
Report problems or “maybe problems” faster to address symptoms before they become faults. For example, use a pickup counter (such as the Arc Sense alternate method). Investigate low-energy traveling-wave events with the line-monitoring feature in the SEL-T400L Time-Domain Line Protection.
Find and fix faults fast with impedance-based and traveling-wave fault locating in SEL relays. Quickly identify and isolate faulted sections of the feeder with the SEL-FLT and SEL-FLR Fault and Load Transmitter and Receiver System. It offers 1% accuracy metering, loss-of-load detection, and faulted circuit indication.
Improve and automate fault locating, fault isolation, and service restoration with SEL DNA (Distribution Network Automation).
Increase protection sensitivity, selectiveness, and reliability by installing additional reclosers. For example, one utility uses one recloser for every 300 customers, every 2 to 3 circuit miles, or every 2 MW of load.
Improve service continuity by applying single-phase tripping and reclosing in distribution feeders.
Decrease the risk of fires or other hazards by disabling reclosing and using more sensitive protection during extreme weather conditions. Don’t reclose for faults in a high fire risk area; apply selective reclosing with respect to fault location.
Keep workers safe with instantaneous tripping during hot-line tag conditions.
Get event information immediately! The SEL-2240 Axion and SEL-3555 Real-Time Automation Controller (RTAC) allow automated event collection, automated fault location, and disturbance monitoring.