Fault localization
This solution facilitates the maintenance of the electrical network by narrowing down the location of the defect, meeting the beneficiary”s desire to have the shortest possible interruption times, thus, a superior quality of the delivered electricity.
Objectives that will be achieved in this way
> locating the affected network section by implementing the software in the measuring instruments installed in substations and substations
> automating the procedure for locating the defect, notifying the dispatcher in a few seconds
> reducing repair and downtime
> minimizing switching operations during fault location
Process description
For good fault location accuracy, a Meg39 will be installed in the transformer station on the MV side and several MEG45s will be mounted in the key points of the network, in the transformer stations related to the analyzed feeder on the LV side.
All devices will have GPS mode with antenna for time synchronization.
Communication (bidirectional) with the faulty central location server is carried out through FO or through GPRS/GSM modules installed in the devices.
The triggers for starting the fault location process are predetermined percentage changes in the main electrical quantities.
Dedicated software analyzes the data from the analyzers, using mathematical algorithms and data comparison.
The location of the fault will be determined with a possible error of a maximum of 500 meters.
Using protocols such as IEC-104, time-stamped short-circuit or ground fault messages will be sent to the SCADA.
Emails with the fault location containing the power line ID and GPS position on the map will be sent to predefined destinations.
In order to locate faults on several MV feeders from the same transformer station, Meg74 will be used, which will be able to simultaneously monitor a maximum of 12 medium voltage departures.