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Thread: transformer nameplate

  1. #1
    Join Date
    Jun 2008
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    2

    Post transformer nameplate

    I am looking for information on how to read the information that is listed on transformer nameplates by the manufacture.

  2. #2
    Join Date
    May 2005
    Location
    Barboursville, West Virginia
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    895
    That is a very general question. You might do better to quote the actual information you are concerned with and let us disect it from there. I'll give it a try anway, though. The important stuff is:

    1. the kVA rating. This tells you the capacity of the transformer.
    2. primary and secondary voltages. This tells you what output voltage you will have with a given input voltage.
    3. winding orientation (i.e. delta vs wye). This tells you how the windings are inter-connected.

  3. #3
    Join Date
    Mar 2006
    Location
    Westchester County, New York
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    8,169
    Quote Originally Posted by hommer
    I am looking for information on how to read the information that is listed on transformer nameplates by the manufacture.

    Hommer
    Go to the transformer websites, and you can find some very good information that may help you.

    www.solaheviduty.com

    www.jeffersonelectric.com

    www.acmepowerdist.com

    You can also go to GE and SQD sites for more info.
    Instructor, Industry Advocate

  4. #4
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    Dec 2007
    Location
    Louisiana
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    277

  5. #5
    Join Date
    Jun 2008
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    2

    Transformer nameplate

    Thanks for your response

    Hommer

  6. #6
    Join Date
    Jul 2008
    Posts
    1

    Question 3 phase transformers

    what is a 3 phase transformer and how does it look like.

  7. #7
    Join Date
    Feb 2008
    Location
    Newfoundland, Canada
    Posts
    45
    http://www.transformerthailand.com/i...150_24_dd0.jpg

    There's a vast amount of differnent types of 3 Phase transformers but they are basically all designed to do the same thing, to step up or step down the Voltage for transmission or for use.


    ~FyE~

  8. #8
    Join Date
    Feb 2005
    Location
    Charlotte, NC
    Posts
    6,347
    (Look at the attached picture)

    Top The manufacturer (optional) and the name of the equipment, in simplified terms

    KVA Kilovolt-ampere ratings are based on the type of cooling class and the desired temperature rise.

    Class OA: Oil-Immersed, self-cooled

    Cont. Rise 55/65 oC are two ratings at which the transformer can operate continuously. The higher the temperature allowed, the higher the rating. It should be noted that a high ambient temperature rise on hot days could shorten transformer life.

    HV 24,900. The primary line-to-line nominal voltage

    LV 480Y / 277. The secondary Wye connection voltage, line-to-line / line-to-neutral (single phase).

    % IZ 5.7% impedance voltage at 75 oC

    MFG DATE Manufacturing date

    BIL Basic Impulse Level of windings.

    HV/LV AL/AL. The conductors are aluminum.
    CONDUCT

    NOTES The note section in this transformer declares that PCB contamination is less than one (1) parts per million (PPM).

    APPR. Weights are critically important when installing, moving, or
    WEIGHTS un-tanking the transformer.

    TAP This box shows the no-load tap changer positions A - E for the line (high voltage) input to the transformer. 24,940 is in the center (C).

    MAX AMPS Based on 840KVA. Varies inversely with the voltage setting of the tap.

    DIAGRAMS The diagrams show (1) connection scheme, (2) angular displacement, and (3) physical bushing arrangement as viewed from the top
    Attached Images Attached Images  

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