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Transformers and Varying DC Current

Will DC current that varies, for example a DC square wave, but that only sinks to neutral (0V) and not enough to cause current to flow in the opposite direction, pass through a transformer? If so, how will you be able to calculate reactance for this?
Asked by: bobosoft | Member Since Feb-2010 | Asked on: Feb 15th, 2010

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Showing Answers 1 - 2 of 2 Answers

No, only change in flux will induce the emf in a ckt. and that only feasible with AC that goes in opposite direction also. But in case of DC that produce flux with no change that never cause any emf in circuit. In case of DC square wave you change the magnitude of a wave from zero to max.

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Answered On : Aug 8th, 2010

View all answers by ravs42

A DC square wave will have a very high value of dv/dt as compared to the pure sine wave. When it is striked to transformer, a high value of dv/dt would not be responded by it, as a result, the waves are bounced back to the supply side leading to overvoltages i.e. voltage spikes would be observed. so could lead to saturation of magnetic circuit eventually.

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