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Fault Locator for Distribution Systems

Fault Locators are devices and software typically installed at a substation to identify fault events, identify fault types: three-phase-to-ground, double-line-to-ground, single-line-to-ground faults, and calculate the distance from a monitored point to the identified fault source in a distribution system. Due to the complexity and topology of distribution systems, fault locating methods used in transmission systems are not readily applicable to the distribution system. To further enhance the performance of fault locators, they are often integrated with distribution management systems (DMS).

In general, inputs to a fault locator unit are low-frequency transient waveform data for 3-phase voltages and currents; ground pickup current; phase pickup current; ratio of fault peak current to pre-fault peak current; and sequence impedance unit (positive and zero).

Output information may includes: fault event; fault type; and distance to fault location from the monitoring point.


Fault locator for distribution systems estimates distance to fault location from the monitoring point (usually at the substation) and support three-phase wye and delta configurations.

Key Technology Area: 
Advanced Control Methods

Sample Vendors:


(Disclaimer: This is a representative sample list of vendors which is updated frequently. The SGIC portal does not endorse any companies or products listed herein.)