I have noticed that some high voltage bushings mainly found on the high voltage side of transformers (eg 20kV) have two prongs spaced out like in the picture below.

High voltage bushings.

One seems to be connected to the high voltage conductor and the other seems to be grounded. I believe it has to do something with high voltage discharges but I can not find any information on the matter. So what is the exact purpose of those prongs?

  • 3
    \$\begingroup\$ Looks like Arcing Horns \$\endgroup\$
    – Eugene Sh.
    Commented Jul 7, 2021 at 17:24
  • \$\begingroup\$ @EugeneSh. Thanks that exactly what I was looking for! \$\endgroup\$ Commented Jul 7, 2021 at 17:28
  • \$\begingroup\$ Protection against lightning, limits the voltage across the insulator if the line is hit \$\endgroup\$
    – Neil_UK
    Commented Jul 7, 2021 at 21:03


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