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Why there are so many ratings?

asked 2018-10-31 10:04:59 -0500

rafaels100 gravatar image

Hello ! I understand that the ratings are for specifying thermal limits in the branches or the transformers, but why do we have 12 ? Wouldn't just one be enough ? Thanks for any insights on this matter, regards !

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answered 2018-11-01 02:09:54 -0500

perolofl gravatar image

Transmission lines have different ratings for different ambient temperatures. Also different rating for normal operation and short time overload operation after contingencies. There are equipments in the breaker bay with different current rating, e.g. breaker, current transformer, switches.

From rev 34 there are twelve ratings, which is enough for the need of most users. You just use the number of ratings that are necessary for you needs.

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Oh I see, thanks !

rafaels100 gravatar imagerafaels100 ( 2018-11-01 08:14:28 -0500 )edit

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Asked: 2018-10-31 10:04:59 -0500

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Last updated: Nov 01 '18