Two 2ry delta feeding a converter
Two 2ry delta feeding a converter
(OP)
Instead of a conventional back to back 6 pulses converter connected to a single secondary winding I found an old circuit where each set of thyristors is connected to a separated delta winding.Reactors were introduced between the DC buses of the two thy groups.I would like to understand the reason.Thank you.





RE: Two 2ry delta feeding a converter
RE: Two 2ry delta feeding a converter
I am really sure that transformer is a delta/delta/delta.This converter is used to drive a shear (left side) that must be electrically synchronized with right side shear.
How much to be gained from two six-pulses converters connected from the same source?
RE: Two 2ry delta feeding a converter
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Two 2ry delta feeding a converter
RE: Two 2ry delta feeding a converter
The question is the gain if compared with conventional arrangement back to back fed by a single 2ry winding.
RE: Two 2ry delta feeding a converter
RE: Two 2ry delta feeding a converter
The motor runs just in one direction but I think you are right.
I will try to "draw" it.
At left side consider fwd bridge fed by the first delta 2ry.Positive bus at top.Add a reactor and HSCB and create node A. At right side consider the reverse bridge fed by the second delta 2ry. Positive bus at bottom. Add a HSCB and reactor and create node B.Complete fwd negative bus to B and rev negative bus to A. Motor is connected at A an B.I think that this configuration can provide motor plugging in order to achieve better synchronization with the other blade drive.( It is a plate mill shearing line)
Am I right?
In such a case, is this configuration better than conventional back to back?
RE: Two 2ry delta feeding a converter
RE: Two 2ry delta feeding a converter
You was MVP solving my doubt about 12 pulses series converters some months ago.
Could you please help me again?