What Are Corona Rings on High Voltage Insulators?

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Corona rings are devices used on high voltage insulators to reduce the electric field strength at the insulator's ends, thereby minimizing the risk of corona discharge. They help maintain a long creepage path, which is essential for preventing electrical breakdown. The term "corona ring" is used to describe these components, which are often implemented in high voltage applications like voltage multipliers. Research indicates that corona rings can help equalize the electric field around circuits, enhancing overall performance and safety. Understanding their function is crucial for effective high voltage system design.
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Please explain what these things are for. I'm guessing they reduce the e-field strength at the end of the insulator while maintaining a long creepage path, maybe? Or something about reducing corona discharge?

What are they called? I can't seem to get a good search term.

20220510_104654.jpg
 
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Found it. It's a "corona ring". More than I really wanted to know in this paper. Although there are some things I still don't really have a good feel for.

https://www.researchgate.net/figure/230-kV-three-dimension-model-of-clean-insulator-with-corona-ring_fig1_303737136
 
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200kV voltage multiplier with corona rings to help equalize the electric field around the circuits.
 
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