Impedance-frequency based method of transverse fault location in medium voltage cable

Impedance-Based Short Circuit—Short Circuit Fault Location Method in Coaxial Cables

“…The parameters per unit length of such a line are resistance R0, inductance L0, conductance G0, and capacitance C0. The wave parameters are characteristic impedance Zc propagation coefficient  [11][12][13][14]28]. In this paper, the line of l length is divided into two parts: from the point R to the fault point (x) and from that point to the S point (l-x).…”

“…The characteristic impedance and coefficient propagation were determined by the measurement of input impedances of the undamaged cables in an open and short circuit states (Tables 2 and 3). These parameters can be determined likewise from the geometrical dimensions of the cable [1,2,12,13]. The uncertainty of module and argument measurement of input impedance was estimated by the B type method which is based on the uncertainty limit specified by the manufacturer of the Hameg 8118 LCR bridge.…”

“…The uniform distribution of the density function of error probability distribution was assumed. The expanded uncertainty was calculated for a confidence level of p=0.95 [38]. gives an example of the results of determining the distance to the fault location and the value of the transverse impedance of the fault for CABLE 1 and the assumed distance to the fault location x = 5.0 m, while in tables 8 -12 for the assumed distance to the fault location x = 10.0 m. For the distance to fault location the real part of the solution was considered and the percent error in the calculation of the distance to fault location was obtained from the formula [11,12]…”

“…Despite the existence of new generations 2 VOLUME XX, 2022 of equipment, cable fault location is still both art and technology. In order to locate faults effectively, apart from appropriate equipment, vast experience is also needed, as well as extensive knowledge, constantly enriched with new theoretical research, computer simulations and experimental verifications [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. When it comes to the initial fault localization, we encounter methods that measure voltage and current at one or both ends of the cable [15,16].…”

“…When it comes to the initial fault localization, we encounter methods that measure voltage and current at one or both ends of the cable [15,16]. Moreover, there are impedance methods that measure input impedance in the open state or a short circuit, at on one or both sides of the cable [11][12][13][14].…”