Recent content by XPTPCREWX

  1. X

    Phasor Leading and Lagging Angles

    1.) Can you provide a reference about this for phasors? 2.) If n≥0 why did you express "V2 leads V1 by -20°" 3.) The terms "Lead" and "Lag" already contain information about which way to traverse the angle from the REFERENCE phasor. What does the negative mean in "V2 leads V1 by -20°"...
  2. X

    Dielectric Polarization Components in Ideal RC and C circuits

    Any takers? I haven't got any replies yet, wondering if I am missing any information or if what I have posted is not clear enough or too abstract. Feedback would be appreciated. Thanks again.
  3. X

    Phasor Leading and Lagging Angles

    Consider two voltage phasors: V1 = 1 volt @ 50°, and V2 = 1 volt @ 30°. It follows then that the relative phase shift between these two phasors can be expressed by any of the four following descriptions in terms of leading and lagging angle relationships. 1.) V1 Leads V2 by 20° 2.)...
  4. X

    Dielectric Polarization Components in Ideal RC and C circuits

    Hi, I would like to know what the theoretical implication is, as it pertains to RC circuits of the following hypothetical situation(s): If one were to connected an ideal discharged capacitor in parallel with an ideal voltage source with zero resistance in the loop, the calculated RC time...
  5. X

    Voltage Vector/Scalar Components, SI Units, Direction and Polarity.

    All, please help me refine, restate, explain, understand, expand, add, remove, answer the below statements/ questions. Thanks in advance. 1.) Voltage is considered a scalar quantity. (J/C in SI Derived Units) which is a magnitude of energy per direction with this example. Some...
  6. X

    Inductor coil

    Is it true that when a lower voltage is applied across an inductor it burns up the coil? If so can someone please explain why?
  7. X

    Power Factor

    had a feeling that, that was the reason, but wasn't sure....thanx
  8. X

    Power Factor

    Why is it that the utility will penalize a customer for a low power factor. I cant imagine why they would penalize you if a purely reactive load puts all its power back into the mains.
  9. X

    460v/480v Code

    Is it against code in any way to have a 460v motor connected to a 480v supply voltage? What problems can be encountered when doing this? Thanx
  10. X

    VFDs and Motor Configuration

    Can someone please give me some general rules of thumb in dealing with VFDs and 3 phase dual wye motor winding configurations. I would like to know when you would wire the motor up for a low voltage or high voltage application when using it with a VFD,under what conditions, and why. Thanx
  11. X

    Phase to Phase fault?

    In a 480v Three Phase Induction Motor.....what kind of educated guess or assumption can be made as a cause, when two of the three fuses blow? Is there any type of significance in two fuses blowing instead of just one in a three phase motor circuit? If only one fuse blew it basically would...
  12. X

    Step Up Transformer

    It is understood that you cannot have something from nothing, but how is this the case with a step up transformer? It seems that stepping up the voltage is stepping up the potential energy and since more windings actually increase the resistance there will be lower current which is how most...
  13. X

    IEC Contactors

    Thanks, for some reason I was thinking capacitor since it said starter.
  14. X

    IEC Contactors

    Can someone explain to me what a 3 phase IEC Contactor/starter is, how it works, and what its used for? Thanks