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Magnetic fields near overhead distribution lines-measurements and estimating technique

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3 Author(s)
Vinh, T. ; American Electric Power Service Corp., Columbus, OH, USA ; Jones, T.L. ; Shih, C.H.

Measurements and analysis of magnetic fields in the vicinity of 51 separate overhead distribution lines are summarized. Data obtained covered a wide range of loads up to nearly 300 A. Results of measurements and correlation between the magnetic field and the phase currents at various distances from the line are discussed. A method of estimating the magnetic field exposure based on the load history of the distribution circuits is presented. A good correlation between the maximum primary current and the magnetic field at lateral distances within 15 m from the centerline was obtained. Near secondaries and service drops, magnetic fields generally decrease with increasing distances. A weak relationship between magnetic fields and conductor currents was found for secondaries and service drops

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Power Delivery, IEEE Transactions on  (Volume:6 ,  Issue: 2 )