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  1. brettduncan

    The effect on the primary when correcting the PF on the secondary

    Good day, If I correct the power factor (the kW remains the same) on the secondary of a transformer, will the primary power factor also be corrected? regards, Brett
  2. brettduncan

    MV flash due to leakage

    what sort of information would one need. I have the amount of amps per phase, the reactive, real and apparent power and the PF. Will this help?
  3. brettduncan

    MV flash due to leakage

    We installed a generator to run in cogeneration and standby mode with our utility company (Eskom - South Africa). We experienced a flash between neutral and ground due to creapage. I need to work out the voltage drop caused when the flash accured. I know that the reading taken before the flash...
  4. brettduncan

    Ferrite electromagnets

    no this is not a school project.
  5. brettduncan

    Ferrite electromagnets

    Thanks again MagMike, Here is a break down as to what I'm trying to do. It needs to be a two dimensional levitation system whereby a user can change the position in the vertical and the horizontal axis. Firstly, the system must perfectly levitate the object and then be able to externally (via...
  6. brettduncan

    Ferrite electromagnets

    thanks MagMike, Just a question regarding want I want to do. The formula that I'm using to calculate the number of turns, etc. is V = 4.44 * N * f * Omax where Omax = area * Tesla rating Do you thin that this formula will actually work? Thank you, Brett
  7. brettduncan

    Ferrite electromagnets

    Thank you once again MagMike, I have searched extensively regarding ferrite rods? Will you be willing to help me out in getting some rods and shipping them to me. I will wire the money from a bank here to you over there. Thanks, Brett
  8. brettduncan

    Ferrite electromagnets

    thanks MagMike, I have searched extensively to try and locate ferrite rods with diameters between 15mm and 25mm in South Africa, do you perhaps now of a good source to purchase similar sized ferrite rods? Could I also get a bunch of smaller rods and bind them together with epoxy to form a...
  9. brettduncan

    Ferrite electromagnets

    Good day, I need to build a two dimensional magnetic levitation , but the problem i'm having is that the electromagnets are very sluggish in response time. Would a ferrite core work better then normal mild steel? I'm controlling the current with a PWM signal at about 4kHz. What other...

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