The problem of designing the coils for a large power transformer is one of great complexity. In addition to the obvious parameters of operating voltage and current, impedance and losses, the designer must consider many other requirements, including the ability to withstand various types of impulse voltage waves and the mechanical strength to resist stresses resulting from short-circuit conditions. A requirement which is always present is that of maximum reliability. At the same time it is essential that the size, weight and cost of the finished transformer be as small as possible.
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