I have a really basic transformer identification question

[terryismyname]

Well, I am simply trying to learn on the job.

I don't understand why these transformers have lines through them. one has a solid line through it, the other has an arrow.

can some one explain to me as if i was stupid, please? if you have time, please explain why the arrow transformer has shields(?) on the deltas.

many thanks! i read so many posts here trying to understand, but still had to ask.

 

[Skogsgurra]

An arrow usually means "induction regulator" which is built like a WRIM with limited rotor movement and the angle between primary and secondary can be varied. But I wouldn't bank on that. More probable is a tap changer, even if the symbol shown shouldn't be used for that. The symbol then usually has a "staircase" included instead of an arrow.

If a tap changer, there is usually a table showing what the positions correspond to. If induction regulator, the lower and upper voltage should be stated. Do you have any such data?

Gunnar Englund

http://www.gke.org

--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.

 

[terryismyname]

this is ALL the information that i have: thank you so much!

 

[DTR2011]

I believe the Delta portion indicates ISO Phase bus.

 

[NCTHAI]

Diagram 1 -
1) Arrow through Star (Y) ==> This indicate Tap Changer - Depending on application, You can vary the voltage
2) Lines below Delta (D) ==> This indicates Delta side winding is connected to switchgear (or where ever connection lead to) is through busbuct.

2) Diagram 2
1) Line through Star (Y) ==> This indicates Tap changer
2) Line from Center of Star ==> This indicates the ground connection of neutral point.

 

[Sn00ze]

If it is on the High side, my first guess would be tap changer symbol