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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. Hence . 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. = A (E/4)2 / 4k. = AE2/64k. The solid core has a larger cross-section area, therefore it has lower resistance. Eddy currents are current loops formed over conductor surfaces due to changing magnetic flux. How can we minimize the core losses in a transformer? 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. Eddy is a circular movement of water in a pond. 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. . 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. Eddy currents are circulating currents present in the magnetic core of the transformer. 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. How to reduce Eddy current Loss. Due to heating of the conductor there is a loss in energy. Copper loss. Similarly, when it comes to electricity, eddies are the circular movement of currents. 4. Numerical Example 2 This loss is called eddy current loss. One easy solution for how to reduce eddy current losses in the transformer is to make the core by stacking thin sheets together. Application of eddy currents: Total copper losses=IR= (I1)R1+ (I2)R2 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. How to reduce hysterisis loss. f2. The heat generated can be kept to a minimum by using a magnetic material which has a low hysteresis loss . This loss can vary depending on the transformer's construction, size, and specific application. 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. The current that is lost in the form of heat dissipation in the conductor of windings is known as copper loss. Heat loss due to eddy current can be reduced by the lamination of the iron core. t2. 2. . 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. K e = Eddy current constant. Solution The correct option is B By using laminated plates as the core of the transformer. Hysteresis losses can be reduced by using material that has less area of the hysteresis loop. They may produce undesirable effects if the large eddy current is allowed into the core of a choke coil, transformer, etc. Interview Question on transformer Loss.3. These currents occur due to the difference in magnetic flux in the core of the transformer. As these losses are eddy-current losses, they can be reduced by careful material selection and thoughtful design. Hysteresis loss in transformer is denoted as, Eddy current loss in transformer is denoted as, Where, K h = Hysteresis constant. Using a magnetic material of high resistivity (e.g. 2.Secondary copper losses take place due to the flow of current in the secondary winding of transformer. 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. While energy saving is always desirable, there are cases where other considerations require a compromise. This will decrease the eddy current and hence the losses made by it too. Eddy currents are reduced by using multiple plates instead of using a large plate. Therefore, Eddy Current Loss in each Lamination = (emf induced)2 / Rlamination. Applications of Eddy Current The eddy current is undesired in the motor, transformer as it cause heat loss which is wastage of energy. 1.Primary copper losses in transformer take place due to the flow of current in the primary winding of transformer. By making use of a laminated core, the eddy currents produced in the core of a transformer are reduced. The Hysteresis Loss and Eddy Current Loss in fact can be shown to depend upon the square of lamination thickness. However, a common definition of Core Loss is the amount of power that is lost when an electric current flows through a transformer. They are useful in induction heating, levitating, electromagnetic damping, and electromagnetic braking. Methods to reduce the energy loss in transformer: Use of low resistance wire for the winding of the coil. Eddy Current Loss in Transformer. As there are 4 laminations, hence total eddy current loss. Eddy current is not used in a transformer. EXPLANATION: The eddy current loss can be reduced by increasing the resistance of the core. 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. . 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. If the core is solid and made up from ferromagnetic materials, it effectively acts as a single short-circuited turn. Eddy current loss in the transformer is given by: Pe = Ke Bm2. 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. According to Ohm's Law, the lower resistance causes a higher current . Damping: The coil of the measuring instrument is mounted in the light metal frame. They can be minimized by adding slots in the conductor surface & laminating. 2. These circulating currents are called Eddy Currents. Eddy current loss in the transformer is . Let us now calculate the resistance offered by the lamination to the eddy current. How can hysteresis loss be reduced in transformer? To do that, the core is formed by combining several insulated or laminated metal plates. Continue Reading Matt Jennings Former Youth Basketball Coach Updated Aug 31 Promoted In designing an "energy efficient" motor, there are obviously several options. As these currents are not responsible for doing any useful work, and it produces a loss (I 2 R loss) in the magnetic material known as an Eddy Current Loss. Rlamination= Resistance offered by each lamination = 4k/A. It is a nuisance in a transformer. So option 1 is not correct. Because the resistance of the bulk conductor is usually low, eddy currents often have large magnitudes and heat the conductor. Created by Mahesh Shenoy. Eddy currents can be reduced by channelizing the current paths in a conductor. However, the eddy current can be usefully used in the following applications. Especially in a transformer core, if the core is solid metal (usually iron), the eddy currents are expansive, in counter to the coil current. silicon steel). V Watts Where; K - coefficient of eddy current. Eddy current losses due to joule heating in the core that are proportional to the square of the transformer's applied voltage. They will occur when the conductor experiences a changing magnetic field. 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. 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. K f = form constant. The magnitude of the eddy currents produces a large current since the resistance of the metallic conductor becomes low. Suggest Corrections 2 Similar questions Queries Solved:1. 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 Types of Transformer Loss. For example, a small transformer may suffer a smaller Core Loss than a large transformer.

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