![]() ![]() Buried and aerial metallic pipelines that run parallel to or are placed in the vicinity of overhead AC high voltage transmission lines are affected by this field resulting in an induced voltage on the pipelines. The currents owing through a transmission line produce a rotating magnetic field of vertical and horizontal components which are orthogonal in space and vary with time. The obtained results showed to be satisfactory and consistent with the experimental ones. The results obtained using the developed program illustrated to be consistent with previous literature results. The program calculates the current density induced in objects underneath or in the neighbourhood of the transmission line. A computer program was developed to model and simu late the magnetic fields produced by power lines. The induced voltage on the neighbouring pipelines was calculated. The equations of magnetic fields of the transmission lines and the density of currents induced in the human bodies and metallic ships surface were introduced. Metallic pipelines buried in the same corridor are affected with many factors, namely : the power line configuration, separation distance between transmission line and pipeline, separation distance between conductors, the transmission line tower height, existence of the earth wire, the sequence of the power supply, the length of corridor and the fault conditions. There are two types of transformer i.e., step-up and step-down transformer.This paper investigates the interference between electromagnetic field produced by high voltage power lines and liv ing organisms and metallic objects underneath the transmission lines such as ships, at rivers crossing, and vessels passing under or near to power lines. Transformer is used to increase or decrease the amplitude of an alternating emf current. It is based on the phenomenon of electromagnetic induction. Magnetic fieldlines on a hor generator#(iii) Current can induce in a circuit by two methods i.e., by moving a coil in a magnetic field or by changing the magnetic field.ĪC generator generates alternating current. (ii) The direction of induced current in a straight conductor is given by Fleming's right-hand rule. (i) The phenomenon of generation of an electric current in a closed circuit by changing the magnetic field is called electromagnetic induction. ![]() It is a rotating device used for converting electric energy into mechanical energy. If the first finger points in the direction of magnetic field and the second finger in the direction of current, then the thumb will point in the direction of motion or the force acting on the conductor. It states that stretch the thumb, forefinger and middle finger of your left hand such that they are mutually perpendicular. The direction of the force on a current-carrying conductor in a magnetic field is given by Fleming’s left-hand rule. (iv) If the current around the face in the loop is in an anti-clockwise direction, then it will behave like the North Pole and vice-versa.Īn electromagnet is a coil that attains magnetism due to flow of current. (a) increasing the number of turns of wire in the coil (iii) The magnetic field produced by a current-carrying circular coil can be increased by (ii) The direction of the magnetic field is found by right-hand thumb rule. (i) The strength of the magnetic field B produced by a straight current-carrying wire at a given point is directly proportional to the current I and inversely proportional to the distance from the wire r. Magnetic filed around a current carrying conductor: (vi) The magnetic field lines never intersect each other.Ģ. (v) The magnetic field lines are crowded near the poles (region of a strong magnetic field). (iv) The magnetic field lines originate from the North Pole of a magnet and end at its South Pole outside the magnet. (iii) The imaginary lines representing the magnetic field around a magnet are known as magnetic field lines. (ii) The magnetic field is a vector quantity. (i) The region surrounding a magnet or a current-carrying conductor in which its effect can be experienced i.e., its force can be detected, is called a magnetic field. ![]()
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