Continue Reading Matt Jennings Former Youth Basketball Coach Updated Aug 31 Promoted This will decrease the eddy current and hence the losses made by it too. K e = Eddy current constant. Methods to reduce the energy loss in transformer: Use of low resistance wire for the winding of the coil. . Eddy is a circular movement of water in a pond. . It is a nuisance in a transformer. They are useful in induction heating, levitating, electromagnetic damping, and electromagnetic braking. Eddy current loss in the transformer is given by: Pe = Ke Bm2. Types of Transformer Loss. Copper loss. Eddy currents are circulating currents present in the magnetic core of the transformer. The eddy current loss is proportional to; Eddy Current loss (We) = K x I2 R (Where K is the eddy current constant) From above it is clear that the higher the current, the higher is the loss. Queries Solved:1. These currents occur due to the difference in magnetic flux in the core of the transformer. Suggest Corrections 2 Similar questions In designing an "energy efficient" motor, there are obviously several options. How to reduce hysterisis loss. Eddy current is not used in a transformer. Eddy currents are reduced by using multiple plates instead of using a large plate. Heat loss due to eddy current can be reduced by the lamination of the iron core. Interview Question on transformer Loss.3. 2. However, a common definition of Core Loss is the amount of power that is lost when an electric current flows through a transformer. Eddy current losses in transformer In this video we explain what is eddy current losses in transformer How to reduce eddy currentHow eddy current makes in tr. However, the eddy current can be usefully used in the following applications. Eddy currents can be reduced by channelizing the current paths in a conductor. How can we minimize the core losses in a transformer? They will occur when the conductor experiences a changing magnetic field. Because the resistance of the bulk conductor is usually low, eddy currents often have large magnitudes and heat the conductor. In order to reduce the eddy current losses in the transformer the core is formed by stacking thin plates called laminations together and each plate is insulated or varnished so that the flow of eddy current is confined to a very small cross section area of each plate and insulated from other plates. silicon steel). Hence . Damping: The coil of the measuring instrument is mounted in the light metal frame. The Hysteresis Loss and Eddy Current Loss in fact can be shown to depend upon the square of lamination thickness. EXPLANATION: The eddy current loss can be reduced by increasing the resistance of the core. Eddy current losses due to joule heating in the core that are proportional to the square of the transformer's applied voltage. Eddy currents are current loops formed over conductor surfaces due to changing magnetic flux. Eddy current loss in the transformer is . While energy saving is always desirable, there are cases where other considerations require a compromise. Rlamination= Resistance offered by each lamination = 4k/A. Hence, high grade or silica steel can be used for designing the core within a transformer because it has extremely less area of the hysteresis loop. 2. Hence the eddy current loss can be reduced in transformers, electric motors and alternators by using thin electrically insulated plates stacked together to form a core instead of solid ones. Solution The correct option is B By using laminated plates as the core of the transformer. To do that, the core is formed by combining several insulated or laminated metal plates. By making use of a laminated core, the eddy currents produced in the core of a transformer are reduced. Eddy current losses can be reduced by making the core of a stack of plates electrically insulated from each other, rather than a solid block; all transformers operating at low frequencies use laminated or similar cores. The lamination thickness usually varies from 0.3 to 5 mm for electromagnetic devices used in power systems and from about 0.01 to 0.5 mm for devices used in electronic applications where low Core Loss in transformer is desired. t2. Created by Mahesh Shenoy. Its value depends upon the nature of magnetic material B m - Maximum value of flux density in Wb/m 2 t - Thickness of lamination in meters f - Frequency of reversal of the magnetic field in Hz V - Volume of magnetic material in m 3 2.Secondary copper losses take place due to the flow of current in the secondary winding of transformer. As these losses are eddy-current losses, they can be reduced by careful material selection and thoughtful design. f2. The heat generated can be kept to a minimum by using a magnetic material which has a low hysteresis loss . To reduce the eddy current loss, the first way is by laminating the core -- that's why you usually see transformers having many layers or stripes on the sides. The eddy's current are a cause of energy loss in alternating current (AC) inductors, transformers, electric motors and generators and other AC appliances or machinery they are reduced by laminating the magnetic cores. How can hysteresis loss be reduced in transformer? This loss can vary depending on the transformer's construction, size, and specific application. Question is When are eddy-current losses in a transformer reduced?, Options are (A) If laminations are thick., (B) If the number of turns in primary winding is reduced., (C) If the number of turns in secondary winding is reduced., (D) Iflaminations are thin., (E) , Leave your comments or Download question paper. Numerical Example 2 V Watts Where; K - coefficient of eddy current. Total copper losses=IR= (I1)R1+ (I2)R2 According to Ohm's Law, the lower resistance causes a higher current . How to reduce Eddy current Loss. This loss is called eddy current loss. They may produce undesirable effects if the large eddy current is allowed into the core of a choke coil, transformer, etc. The current that is lost in the form of heat dissipation in the conductor of windings is known as copper loss. The solid core has a larger cross-section area, therefore it has lower resistance. 4. Hysteresis loss in transformer is denoted as, Eddy current loss in transformer is denoted as, Where, K h = Hysteresis constant. If the core is solid and made up from ferromagnetic materials, it effectively acts as a single short-circuited turn. Applications of Eddy Current The eddy current is undesired in the motor, transformer as it cause heat loss which is wastage of energy. We try to limit eddy currents by limiting the physical distance they travel by making transformer cores (and motor rotors) from a stack of laminated plates, rather than one solid chunk. Let us now calculate the resistance offered by the lamination to the eddy current. Using a magnetic material of high resistivity (e.g. Due to heating of the conductor there is a loss in energy. So option 1 is not correct. Especially in a transformer core, if the core is solid metal (usually iron), the eddy currents are expansive, in counter to the coil current. The magnitude of the eddy currents produces a large current since the resistance of the metallic conductor becomes low. By doing so, eddy voltages can be reduced and the resistance to eddy currents can be increased which will finally result in lower core losses in the machines. . One easy solution for how to reduce eddy current losses in the transformer is to make the core by stacking thin sheets together. = AE2/64k. Eddy current loss depends upon the rate of change of flux as well as the resistance of the path, it is reasonable to expect this loss to vary as the square of both the maximum flux density and frequency. The eddy current loss can be reduced as follows By using thin sheets, called laminations which are insulated from each other by a thin coating of varnish, instead of using a solid block of magnetic material. As there are 4 laminations, hence total eddy current loss. Application of eddy currents: K f = form constant. Copper loss can simply be denoted as, I L2 R 2 + Stray loss Where, I L = I 2 = load of transformer, and R 2 is the resistance of transformer referred to secondary. Hysteresis losses can be reduced by using material that has less area of the hysteresis loop. 1.Primary copper losses in transformer take place due to the flow of current in the primary winding of transformer. These circulating currents are called Eddy Currents. Eddy Current Loss in Transformer. 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