Determining the Accuracy Locating Faults in a Power-Transmission Line by an Artificial Short Circuit Method

Resumo

Locking devices (LDs) and most recorders of emergency events and microprocessor protection terminals are provided with the capacity for fault location determination (FLD) of power transmission lines that are in the operating zone of the North Caucasus Manager Department. The analysis presented in this work of the accuracy of FLDs for 2015 revealed the presence of unacceptable errors in 48 out of 1528 operations. These results resulted in carrying out out the experimental and theoretical works on evaluation of the accuracy of fault location determination of power transmission lines by devices and software packages of Russian and foreign producers. Taking into account that short circuits are one of the most widespread forms of damage to power transmission lines, artificial single-phase short circuits were created in the tested Vladikavkaz-2–Grozny 330-kV power transmission line without power supply to consumers being interrupted. The research results showed that the SMV (OAO R&D Center at the Federal Grid Company of Unified Energy System, Novosibirsk, Russia), TWSFL-8 (Qualitrol, United Kingdom), and Bresler-0107.090 (R&D Enterprise Bresler, Cheboksary, Russia) equipment have the smallest error of fault location determination (less than 400 m). All these devices use the double-sided travelling wave method. Devices and software packages based on measurement and analysis of currents and voltages of zero sequence have an error at least three times greater. It is proposed to set up a manufacturer-independent testing center in Russia.