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  1. Gman1977

    VFD rotor resistance value

    Hi, there is lots of info regarding the value of actual rotor resistance when using vector control, eg, the change of value due to temperature changes. I am looking to find some info regarding what is the effect if the VFD rotor resistance parameter setting is incorrect. For example, if the...
  2. Gman1977

    Core balance CT magnetic flux interference

    Hi Scottf, Discussions with CT manufacturer are ongoing as far as I know. They did originally state that there should be no issue with the proposed mounting, however we have shown through testing that that is not the case be moving the CT's to varying positions. The CT's are 50/1A, Switchboard...
  3. Gman1977

    Core balance CT magnetic flux interference

    Hi, Just to let you know how testing went. We repositioned the Core Balance into the Main Bus Chamber which gave us 300mm clearance from the Phase CT's and this did improve matters even further but we still have the issue, just less pronounced. I am concerned also about the Core Balance CT...
  4. Gman1977

    Core balance CT magnetic flux interference

    Hi Waross, Don't worry, im well aware of the danger of open circuit CT's. My question is relating to the magnetic flux produced by a shorted CT. eg, is there any?
  5. Gman1977

    Core balance CT magnetic flux interference

    Thank you Hamburger Helper. That makes sense. I will be testing tomorrow, i'll let you know how it turns out.
  6. Gman1977

    Core balance CT magnetic flux interference

    Hi HamburgerHelper, Thank you for your response. If I short out the Phase CT secondary's, the magnetic field produced by the secondary CT's will be greatly reduced, is this correct?
  7. Gman1977

    Core balance CT magnetic flux interference

    My Engineering department want me to remove the phase CT's to 100% prove they are interfering with the core balance CT but this is impracticle, anyone have any experience of this, CT and switchgear manufacturer both say this shouldn't be an issue but it certainly seems to be.
  8. Gman1977

    Core balance CT magnetic flux interference

    But how is there current flowing? By shorting out the secondary it has become a closed loop.....My maths is saying that maximum current is there but my brain is saying zero.
  9. Gman1977

    Core balance CT magnetic flux interference

    Hi guys, First time poster. Question is.... If the secondary of a CT is shorted out completely, S1 to S2, can current still flow in the secondary winding? My maths is saying yes but my brain is saying no. Sorry if this is a stupid question. The background to this question is......I have a new...

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