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On line Tap Changer in Arc Furnace
Questions about On line Tap Changer in arc furnace and transformer

Why ON LINE TAP CHANGER (OLTC) connected in primary of any Arc furnace? Why there is a reactor also connected with primary winding of any arc furnace transformer?

How it works and help arc furnace operation apart from changing of secondary voltage without switching off transformer?

The online tap changer is connected in the primary because the current is significantly lower on the primary of an Arc furnace transformer.

Reactors are used on the primary to stabilise the arc during fusion and to optimise the functionality of the furnace.

http://electrical-engineering-portal.com/4-essential-features-of-transformer-on-load-tap-changer-oltc

https://www.reinhausen.com/desktopdefault.aspx/tabid-1572/1095_read-4842/