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Recent content by e_bettio

  1. E

    1500 vdc alarm circuit ?????

    I had to do something similar once. I made a voltage divider out of resistors. I used a series/parallel combination to drop the voltage significantly. The resistors I used were Phillips VR68 series. I then potted the whole thing in epoxy. The output was a voltage of course, not a 20mA signal. Eric
  2. E

    Three Phase Full Wave Bridge Rectifier Current Calculation

    Generally speaking, the AC current into a six-pulse bridge is equal to 0.82 of the DC current. So in your diagram: Is1 = 0.82*Iload. Iload is a DC (average) current, Is1 is an rms current. If you want to be a bit more scientific about it, sketch the currents. Id1 is equal to Iload 1/3 of the...
  3. E

    Transformer behaviour feeding a fault from a DC supply

    I am trying to understand the behaviour of a transformer under a fault condition. The transformer feeds a fault (three-phase bolted short for example). The supply to the transformer is an inverter. the inverter may fail in such a way that the inverter DC circuit effectively connects across two...

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