Utilizing an SF6 circuit breaker as a normally open point

[jjs378]

Hi. New here. I have a question about utilizing an SF6 circuit breaker as a normally open point on a bus. Most utilities I have worked with have operating procedures that do not allow an SF6 circuit breaker to be utilized as an normally open point. (ie - Left energized at line voltage on both sides of the open contacts for long periods of time.) Other than preference, is anyone aware of any references that are available to support that position? IEEE C37.09-2018 Section 4.5.8 eludes to the likely hood of flash over from exposure to switching transients. I could have sworn I read a white paper on this topic years back, however the Google is failing to locate anything useful. I would appreciate any information that may be out there.

 

[bacon4life]

I have heard of limitations for synching across breakers, since having the sides 180 degrees out of phase puts 2x stress on the open contacts. Sorry I don't have a specific reference for that.

In my state the rules for clearances require a visual open, which in some cases gives a slight preference for normal open points to be air break disconnects rather than SF6 breakers.