The meaning of capital and small letters

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The article says that capital letters are used for primary windings, while small letters are used for secondary windings.

Now, as far as i know, the convention is: capital letters for high voltage side, and small letters for low voltage side. This isn't always the same as what is stated in the article.

As i am not sure, I didn't want to edit it right-away. If anyone can confirm this and edit the article accordingly, it would be great.

Sinan Taifour (talk) —Preceding comment was added at 11:12, 17 January 2008 (UTC)Reply

In once learned that the primary side is denoted by capital letters. And usually, the primary side is also the high voltage side. Wikispaghetti (talk) 01:40, 28 January 2013 (UTC)Reply
Apparently the primary and the HV side are not the same as discussed in this article. 174.118.142.187 (talk) 12:33, 3 May 2013 (UTC)Reply

According to this (http://static.squarespace.com/static/5005eed384aedff14624a980/t/5152781fe4b0574a80b78f63/1364359199773/Understanding%20Vector%20Group%20of%20Transformer.pdf), it's HV then LV. The high-voltage side is always first, even if it's not the primary side. Tara Zieminek —Preceding undated comment added 22:36, 27 June 2013 (UTC)Reply

According to whom this is called a vector group?

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I’ve read in many websites the name “vector group “, yet the IEC standard 60076-1 never uses that name, but instead it uses “connection symbol”. So we should clarify this in the lead paragraph, either by changing it to something like “In electrical engineering, a vector group, officially called a connection symbol, is […]”, or we should remove the phrase “vector group” altogether. —Alej27 (talk) 14:45, 16 July 2021 (UTC)Reply