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I am reading an application guide related to high-voltage DC and have come across a symbol that I do not recognize:

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The source of the schematic is this document from Siemens.

Based on the context, my guess is that it might be either some sort of adjustable or controllable element, like a contactor or adjustable reactor, but I am not sure.

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  • \$\begingroup\$ Most likely a filtering inductor. You have AC to DC to AC link. \$\endgroup\$ – StainlessSteelRat Apr 24 '20 at 23:09
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If you look further in the publication, you will find that it is a smoothing reactor.

In skimming through the document, I didn't see an explicit statement about the reactor being adjustable, but they did mention something about them being constructed with a number of "partial turns." They do say that the capacitor banks are tuned.

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It is a choke (inductor).

Symbol comes from IEC60617 Symbols.

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