The built-in fault-locating methods in SEL devices allow you to quickly identify faults, dispatch crews for repairs, and restore service faster.
Traveling-wave fault-locating technology calculates the locations of temporary and permanent faults by measuring the arrival times of the naturally occurring traveling waves caused by a transmission line fault. Accurately detecting these waves requires ultra-high-resolution monitoring, and locating is accurate to within one tower span (±300 m).
Impedance-based fault-locating technology calculates fault locations by detecting changes in line impedance as a result of a fault. Impedance-based locating is reliable and accurate to about 2 percent of a line’s total length.
Use ultra-high-resolution monitoring to detect traveling waves propagating from temporary or permanent faults, as well as fault precursors. These devices also include impedance-based fault-locating methods to detect faults producing traveling waves that are too weak or distorted for use.
Use impedance-based fault locating to locate temporary or permanent faults based on fluctuations in line impedance, current, and voltage measurements.