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enter image description here

enter image description here The only things I'm finding is something called a corona ring.

My questions are

  1. What are they called?
  2. Why are they always in layers of rings?
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  • \$\begingroup\$ Read here: en.wikipedia.org/wiki/Corona_ring what a Corona ring really is. Note the comment under the 2nd photo: Corona rings on insulator strings Your photos show the insulators, see: en.wikipedia.org/wiki/Insulator_(electricity) \$\endgroup\$ – Bimpelrekkie Mar 14 '17 at 14:03
  • \$\begingroup\$ The many rings make the creepage distance longer, it makes it more difficult for the high voltage to find a path to the other (grounded) side of the insulator. \$\endgroup\$ – Bimpelrekkie Mar 14 '17 at 14:05
  • \$\begingroup\$ I see what you mean in the bottom picture, but there are no rings in the top picture. \$\endgroup\$ – Olin Lathrop Mar 14 '17 at 14:06
  • \$\begingroup\$ I guess OP confused the isolator's dishes (rings) for Corona rings. \$\endgroup\$ – Bimpelrekkie Mar 14 '17 at 14:07
  • \$\begingroup\$ Yeah I meant dishes... \$\endgroup\$ – mateos Mar 15 '17 at 11:43
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Those are insulators.

Their shape is designed to maximize the length electricity would have to creep over their surface from cable to mast, and to provide dry and clean "gaps" even in bad weather.

A corona ring is something different (wikipedia has an article).

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    \$\begingroup\$ They are in layers because one is not enough and one insulator that length would break easily. \$\endgroup\$ – Trevor_G Mar 14 '17 at 17:12

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