The Analysis and Calculation of Electromagnetic Field Around Overhead Power Line

Abstract

Distribution network is the connection of the generate system and transmission line, which is at the last stage of the process of the energy transportation. It is complex to judge the direction of the power flow, so that it is significant to study a more effective method to judge the direction of the power flow in the Overhead power line. This paper introduces the principle of the Biot-Savart Law firstly and then introduces the necessity of power system simulation,. To complete the analysis and calculation of electromagnetic field around Overhead power line when Signals Phase Earth Fault occur in the power system, the spatial rectangular coordinate system was established based on the arrangement of the Overhead power line. After the study of 10KV distribution network we create fault simulation platform ATPDraw and based on MATLAB simulation software, we use the electromagnetic transient program graphical input function and the strong calculation function of MATLAB to calculate electromagnetic field around Overhead power line, so as to provide the basis for further analysis. − × π and the direction is perpendicular to the surface determined by the current element and vector r,curve the finger and the direction of thumb is the direction of dB.That is Idl ,dB and r accord the right-hand screw rule. The law of Biot Savart is proved by the H.C. Oster experiment. The experiment illustrate that the force which is given by long straight current-carrying to the magnetic pole is horizontal force. J.B. Biot and F.Savart believe that the force that current element gives to magnetic pole is perpendicular to the surface determined by current element and the magnetic pole, in a same way, a horizontal force. They make a conclusion about the relationship between the force and the angle of the bucking current-carrying,as well as the relationship with distance via the experiment that measure the force given by straight and curve current-carrying to the magnetic sole. With the help of P.S.M. Laplace, they got the rule of the effect of the current element to the magnetic pole. According to the view of the close range function ,the conclusion is understand by public as a rule of the production of magnetic field .