Abstract
When eliminating fault on overhead transmission line it is very important to locate it accurately. This will lead to a less time spent by mobile maintenance team on the line inspection and detection of a fault reason. The most difficult is a distant single phase short circuit location which are the most frequent fault in the effectively grounded network. For an accurate distant fault location basing on the emergency mode parameters it is necessary to execute a set of computations of single-phase short circuit mode. This needs the use of lines mathematical models taking into account electrostatic and electromagnetic coupling of conductors and tower configuration. the easiest way to model a line is to use referential per unit electrical parameters calculated with respect to the limitation of a wires use on different voltage levels. In industrial electric power supply system 300 mm2 wires are often used in 110 kV distribution network whereas their parameters are specified for 220 kV, that is with bigger tower dimensions. Also there are no zero sequence parameters in reference books. The other way is to use relay protection guidelines for line parameters computation, but this documents doesn’t contain equations for double-circuit overhead line with a single protection cable. Besides manual calculations take a lot of time which is inappropriate in accidental situation. The authors have elaborated the equations for symmetrical components of per unit resistance and capacitive susceptance calculation for double-circuit overhead line with a single protection cable. Also the authors have calculated the above mentioned parameters for different wires cross sections and geometric mean distance between phases.
Keywords
Fault location, overhead line, single-phase short circuit, mutual induction, phase capacitance, per unit resistance, mathematical model, electric power supply system, electrical images, symmetrical components.
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