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Homework answers / question archive / Suppose that you have been hired by a textile industry to tackle the Covid-19 pandemic on an urgent basis

Covid-19 pandemic on an urgent basis. As the melt-blown fabric is the core material of the N95 medical mask, your employer ordered an automatic melt-blown fabric machine, and now needs your help with its proper installation. The machine has an operating voltage of 380 V, an operating current of 175 A, and an operating frequency of 314 rad/sec. Your task is to select the parameters of an ideal single-phase transformer required to operate it. It is given that the phase-to-neutral voltage of distribution line is 11 kV, and the power factor is 0.9.

State whether the operating voltage of 380 V and 11 kV distribution voltage are peak or rms values.

b) Determine primary voltage and frequency in hertz.

c) Calculate the required secondary voltage, turns ratio, primary current, and secondary current.

d) Calculate the transformer capacity required in volt-amperes, watts, and volt-ampere reactive.

e) Examine whether the transformer can be operated at a voltage higher than its rated voltages that you calculated in a) and b)? Explain.

f) Determine the transformer capacity in volt-amperes if:

i. It is operated at half of its primary voltage calculated in b)

ii. It is operated at quarter of its primary voltage calculated in b)