Analysis On Power Frequency Magnetic Field Shielding Of Air-core Reactor Based On Ansoft

Air-core reactors have been widely used in the power systems due to its well linearity, initial voltage distribution, low-loss, low noise, easily to install and simply to maintain. As a result of no closed magnetic circuit, the magnetic field of air-core reactor divergence seriously with strong penetrating power. Not only caused their own power loss change, but also become a major source of the electromagnetic pollution in the substation. So we to be appropriate for the present operation of the magnetic shield reactor to reduce the flux leakage properly.In the last decade the air-core reactors are widely used in modern electric power systems, which play an important role. However, these devices are able to emit high magnetic fields, making them one of the main sources of magnetic fields in substations. They may not only produce potential unwanted health threats on both nearby residents and on working staff, but also have electromagnetic influences on electric devices in the vicinity. Therefore, the magnetic field pollution generated by air-core reactors has become a matter of public concern, and analysis of the distribution of magnetic field around air-core reactors is urgent and necessary.Current methods to analyze the magnetic field around air-core reactors include analytical calculation, numerical calculation and experimental measurement. The former two methods require large numbers of actual parameters of air-core reactors in advance, which are difficult to obtain; moreover, under complicated situations, it is difficult to obtain accurate results with these methods. Experimental measurement is the most fundamental and reliable method, while the cost of in-situ experiment is high and it is rarely studied. Simulation is to reduce the original system and perform the experiments in a small space. It is a practical and reliable method which has significant applicable value.This paper first discusses the reactor classification and structural characteristics, magnetic flux leakage analysis produced by the special structure of the harm, and thus produce solve reactors magnetic interference problems.Based on Ansoft Maxwell platforms we were established three-dimensional finite element model of single-phase and three-phase air-core reactor, access to the magnetic flux density distribution data distribution and various points along the route.Then, this paper discussed for two kinds of shielding material, low resistivity and high permeability. After given the principle of low resistivity and high permeability shielding material, elected representative in each of the two materials:aluminum, copper, and iron, steel. Respectively, based on the finite element simulation discussed above four shielding material impact on the shielding effect. The conclusions were as follows:First, the high permeability shielding material is better than a low resistivity, and high permeability shielding effect of iron in the material is much better than steel; secondly measure closer pitch shield, shielding effect of the gap between the more obvious.This paper analyzed the simulation based on comparing the influence factors that the shield acts on the reactor’s magnetic induction density distribution. And then it summarized the best method to shielding. Therefore, the article introduced the application of shielding material in transformer substation and the principle of shielding in detail. At the same time, it compared the conclusion with some known conclusions.