Why do Some Current Transformers Have Four Leads and a Hole?

Discussion in 'Power Electronics' started by johnyradio, Sep 24, 2018.

  1. johnyradio

    Thread Starter Active Member

    Oct 26, 2012
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  2. MaxHeadRoom

    Expert

    Jul 18, 2013
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    In order for a conductor to pass through for current measurement.
    Max.
     
  3. johnyradio

    Thread Starter Active Member

    Oct 26, 2012
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    what are the leads?
    two coils?
    or one coil + core?
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Probably each pair are common to each other.
    Max.
     
  5. johnyradio

    Thread Starter Active Member

    Oct 26, 2012
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    probably?
     
  6. BR-549

    AAC Fanatic!

    Sep 22, 2013
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    A data sheet will come with coil....to show you the connection. We can't see it from here.
     
  7. johnyradio

    Thread Starter Active Member

    Oct 26, 2012
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    Unfortunately, i can't locate a datasheet for this part. This product page says:
    20A/20mA 4 Terminal Precision AC Micro Current
    Secondary Current : 20mA

    This leads me to believe two of the leads are attached to a separate winding, in order to step down the current, and not common connection to the other leads. Isn't that what we're seeing here?

    plz jump to 1:23
     
    Last edited: Sep 24, 2018
  8. BR-549

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    johnyradio likes this.
  9. johnyradio

    Thread Starter Active Member

    Oct 26, 2012
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    What does "narrow set of pins" mean?
    The image in the sheet is unclear to me, i can't tell if it's a separate winding.
    The bottom image seems to show both leads going into a differential amp (?), with calibration pot (?), for difference-current-to-voltage measurement, i think
    yes i know how to google. it didn't come up. Tried "datasheet" and "data sheet".
    https://www.google.com/search?q=zta...69i57j69i60.6006j0j7&sourceid=chrome&ie=UTF-8

    plz share your google results, so i can see how you searched it!
     
    Last edited: Sep 24, 2018
  10. BR-549

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    There are four pins on the object. On one edge, they are widely spaced and on the other edge, they are narrow spaced. Look closely at the drawing. See the coil symbol inside and between the narrow set of pins?

    A lot of times with certain components.........a data sheet link will show up in just a part number search alone. As yours did. All I did was copy "
    ZTA504A 5A/5mA Micro Precision Current Transformer

    " from your ebay listing.

    The google results might be a little different....depending on your location.
     
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  11. johnyradio

    Thread Starter Active Member

    Oct 26, 2012
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    that's not the "part number alone". and it's not "part-number data sheet", as you instructed. Smarmy attitude not needed.

    yep, i see the lead-spacing is narrow on one side. and i see the coil-symbol between the narrow pins. Still unclear whether the wide-spaced pins are the same or different.

    Thx
     
  12. BR-549

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    There are just for strong physical mounting. Can you hear my attitude?
     
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  13. johnyradio

    Thread Starter Active Member

    Oct 26, 2012
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    info!

    Thx
     
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