The influence of the measuring instrumentes accuracy on the criteria for detecting the location of failure in 10 kV lines with a three-wrinded feeding transformer in a metal short circuit
The article is devoted to revealing the influence of the accuracy of measuring instruments on the detection of the fault location in 10 kV lines with a three-winding supply transformer in case of a metal short circuit. The calculations were carried out in phase coordinates, the obtained values were converted into the coordinates of three symmetric components. Earlier in researching, the error of measuring devices was considered to be 0.5%; in this work, calculations were carried out with measurement tolerance of 0.2%. The article shows that an increase in the measurement accuracy leads to an increase in the accuracy of determining the location of failure. The accuracy of detecting the location of the failure was increased from 0.2-6.6 to 0.08-2.6%, which will make it possible to quickly find and eliminate the fault, thereby increasing the reliability of the electrical line.