Research And Simulation Of Magnetic Field During A Building Struck By Lightning In A Substation

We apply VC++ to research and simulation of magnetic field during a building struck by lightning in a substation. In this dissertation there are four parts. They are the computation of the capacitance and inductance parameters in a reinforced concrete structure, the computation of current distributes in a multi-conductors system, magnetic field distributions in a room during the building struck by a lightning and kinds of schemes of protection on electronic systems against electromagnetic interference.During the computation of the parameters in a reinforced concrete structure, the capacitances are calculated by means of the average potential method, and the inductances are evaluated by the Neumann's formula.During the computation of the current distributions in the reinforced concrete structure, -type coupled circuit and constant parameter type are applied in the multi-conductors system. After numerical discretion of the capacitances and the inductances in time domain, we may get node voltage equators. The results of computation of current distributions are compared with the results in other dissertation, and a better agreement between calculated and reference documents result is reached.After the computation of the current distributions in the reinforced concrete structure, the expressions of magnetic induction intensity in a room are deduced, and then were solved from both the circuit and field.Finally, kinds of schemes of protection on electronic systems against electromagnetic interference in room are put forward. They are equal voltage, earthing, shield and discharge current. Then we analyze every kind of scheme of protection.