| Along with fast development of our country economic, the electric power need mount up rapidly, construction of power net mend its pace, the extra high voltage transmission and power transfer increase largely. The problem about power frequency electric and magnetic field from transmission and power transfer have received more and more attention. Intensity, distribution and attenuation rules of power frequency electric and magnetic field from all kinds transmission and power transfer is main content in this paper.There are 9 overhead lines and 7 transformer substationses which are representative with different electric voltage grade are chosed in our study. In order to find the rules of attenuation, we have analysed power frequency electric and magnetic field distribution on aisle of overhead lines, in and out substationses.Power frequency electric and magnetic field of overhead lines are interrelated with span of lines, mode of transfers and paralmeter of circulation etc. From distribution and attenuation rules of power frequency electric and magnetic field, we bring out protective distance. Besides, measure are compared with theory calculate in this paper, there are good results as a whole.In substationses, there are many power frequency equipments and disposal modes. From a large number of measure datum ,we can conclude transmission of 500kV and reactor of low-voltage are main area of distance protection from electric and magnetic field.Regard transformer substation as a whole source of power frequency electric and magnetic field, exterior distribution and attenuation rules of electric and magnetic field are researched. Intensity of power frequency electric and magnetic field out of substation is related by voltage magnitude and capability.Compare these datum with limits of our country about public and occupational exposure, we can restrict protection distance. It can provide the reference knowledge for protection health of public and occupational people.
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