Question

2(h). (In your homework paper, a much abbreviated problem statement suffices.) In an industrial plant ?when equipment is moved, hoists are operated, forklifts are driven, assembly lines are retooled, maintenance is carried out, and so on-electrical accidents occasionally happen. Electrical conduits can be damaged and other mishaps can occur, suddenly short-circuiting a transformer's secondary winding To limit danger to personnel and hazard to property to the extent possible, the electrical engineer plans in advance for such accidents When a transformer's secondary winding is short-circuited, the concept of the ideal transformer fails An engineer probably cannot usefully model a transformer as an ideal transformer in the short-circuit case. In the short-circuit case, rather, the transformer's primary winding appears to be not as it were a short circuit but approximately as it were an inductor Suppose that the transformer primary winding appears to be a 0.500-H inductor when the secondary is shorted. How much current does the transformer's primary winding draw? There is no part 1.) 2(i). Referring to part h, express the voltage across and current entering the transformer's primary winding in the time domain in the short-circuit case. That is, write expressions for v(t) and i(t). It is recommended to work in phasors and then to change to the time domain at the end of your work, but don't forget to adjust for rms 2(k). Observe that, in the case of parts h and j, a circuit breaker will open, whether (preferably) the industrial plant's circuit breaker or (preferably not) the utility's circuit breaker. Therefore, the short- circuit current will flow only for a fraction of a second. (There is nothing to submit for part k. In practical industrial applications, the main circuit breakers can cost tens of thousands of dollars each, but that is less than the cost of the fires and explosions that must otherwise sporadically occur; for though care is taken, it is impossible to avoid 100.0 percent of electrical mishaps in industrial facilities The expensive circuit breakers thus do a necessary job and are simply part of the budgeted cost of an industrial plant's electrical installation. It is interesting to note that the main circuit breaker itself is normally mounted in a steel cabinet in a locked room where forklifts and such are unlikely to run into it! Or else it is in a fenced utility yard like the yard east of Durham Hall.)

Answer 1

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