Research On The Short-circuit Verifying Of Wires

This paper discusses the short-circuit verifying of wires in dynamic stability and heat withstand while the wires are chosen in the design of power system.Firstly, the numerical analysis on the short-circuit currents and their time appearing maximum values is taken in the three-phase symmetry short-circuit of "infinity" system in power capacity. Some new conclusions are got after discussing some basic theoretical questions.Secondly, the following two subjects are discussed according to the calculation of short-circuit current: (l)To verify the dynamic stability condition of wires by using simulated annealing algorithm (SA), the paper calculates the maximum value of rectangle wires' short-circuit electrodynamic stress and gets the conditions of their having the maximum value. Furthermore, some concerned data about the verifying of copper wires are given by analysing vibration spectrum of the electrodynamic stress; (2)In order to get the heat withstand conditions of wires, the paper discusses some common calculation methods, and then tries to study the problem applying artificial neural network (ANN) based on heat principle of metals. The model is shown to be feasible.Finally, the headwaters of harmonic current and its harms to power system are discussed, the influences of harmonic currents to short-circuit verifying are analyzed, some parameters are gained according to the analyse on vibration spectrum of the electrodynamic stress.