Forums » Electrical Engineering

tap positions

    • 6 posts
    April 7, 2019 10:34 AM PDT

    What is the significance of 9a,9b,9c tap positions in OLTC with 17 taps same way 13a,13b,13c tap positions in OLTC with 25 taps.
    What is the specific reason for that ?
    Thanks in advance.

  • April 7, 2019 11:15 AM PDT

    Thanks for the request to answer.  I know a bit about transformers and tap changers.  And this is guess that the subject OLTC is "On Line Tap Changer"  However, the information you gave is sufficiently vague that I don't have a clue.

    Hopefully someone else can translate and give you an answer. 

    I would need a lot more context - really, a lot more.



    • 25 posts
    April 7, 2019 12:33 PM PDT

    It's only the design practices of OLTC Manufacturers, where you get same tap voltage at all three taps like 9a,b,c or 17a,b,c while they are go from coarse to fine.

    • 1 posts
    April 7, 2020 7:05 AM PDT

    These taps are called as Transition taps at the middle of total number of taps. For ex. for 17 no of taps, middle tap is 9. So at 9th tap, tapchanger reverses its position. To do so without stopping, the tapchanger goes through couple of mechanical positions which are known as 9a and 9c.