What Are Corona Rings on High Voltage Insulators?

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SUMMARY

Corona rings are devices used on high voltage insulators to reduce electric field strength at the insulator's ends, thereby minimizing corona discharge. They help maintain a long creepage path while equalizing the electric field around circuits, particularly in systems like the 200kV voltage multiplier. The term "corona ring" is essential for further research on this topic.

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DaveE
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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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1652294138762.png

200kV voltage multiplier with corona rings to help equalize the electric field around the circuits.
 
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