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2 Winding raw to psse switches from and to bus

asked 2022-12-22 16:56:01 -0600

Willy gravatar image

Hi all, I have a raw file in the same version as my psse application (v34). When I import the raw file and view transformers, I see that the to and from bus were swapped during the import (i.e., "I" bus becomes "To Bus Number" and "J" Bus becomes "From Bus Number"). It seems to be associated with the "Winding 1 on From end" box not being checked in the Transformer window. I don't see a direct property for the the winding 1 association in the raw file. Are there specific conditions in the raw file that cause this swap to occur? Thanks for the help!

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answered 2022-12-23 02:23:32 -0600

perolofl gravatar image

In raw data bus I is the "Winding 1" bus and bus J is the "Winding 2" bus. Winding 1 is the winding where the tap changer is located. So, the first bus number (I) is always Winding 1 bus in raw data.

In PSSE the transformers are sorted with the lowest bus number as "From Bus" and the other as "To Bus". Here the location of the tap changer (at Winding 1) is defined by the check box "Winding 1 on From end". If I > J, then J becomes "From bus" and I becomes "To bus".

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Haha. Of course it's the simplest of answers. Although, it's important to note that with 3-winding transformers, the "Last Bus Number" does not adhere to the sorting and can be greater. I'm sure the raw data explanation will come in handy too for people. Many thanks!

Willy gravatar imageWilly ( 2022-12-23 04:30:21 -0600 )edit

Yes, there is no sorting for 3-winding transformers: I = winding 1; J = winding 2, K = winding 3.

perolofl gravatar imageperolofl ( 2022-12-23 07:44:30 -0600 )edit

For 3-winding transformers, all windings have tap changer data.

perolofl gravatar imageperolofl ( 2022-12-23 07:46:04 -0600 )edit

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Asked: 2022-12-22 16:56:01 -0600

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Last updated: Dec 23 '22