Conditions to put primaries in parallel for MV
Conditions to put primaries in parallel for MV
(OP)
Hi,
Please i looking for the conditions to put the MV side of two exact transformers in parallel.
The sources feeding the trafos are MV generators, started randomly, i must install all the necessary to ensure that as of "the equipment (to be installed)" everything after is safe and everything before can be pure random.
I have something similar to that here if it helps:
http://lndang.tripod.com/parallel.htm
Thanks.
Please i looking for the conditions to put the MV side of two exact transformers in parallel.
The sources feeding the trafos are MV generators, started randomly, i must install all the necessary to ensure that as of "the equipment (to be installed)" everything after is safe and everything before can be pure random.
I have something similar to that here if it helps:
http://lndang.tripod.com/parallel.htm
Thanks.






RE: Conditions to put primaries in parallel for MV
Hope this helps
RE: Conditions to put primaries in parallel for MV
the primary of thetransformers are not fed by MV generators.
Each primary is fed from a source 100% indpendent of the other.
I assume that the use of the old time gauge you mentionned is something like: one source is actively feeding the load, the second source (i.e. the one to enter in synchro) is still offline; the control allow to adjust the phases until the gauge marks zero or near 0, then the source enters successfully in parallel with the first. I also witnessed a tentative where the electrician hit the button when the phases were out of sync, the result was a loud "clack" (breaker close) followed by a "vooom" (meters, motors) then a (softer?) "clack" the breaker disconnected: the "system" did not allow the source to enter in parallel. He tried again and next time he gotit well.
I'm asking for the case where the two sources are supplying power, none can be taken offline for "synchro". This is the case where countries share electricity: the 220kV ring from country 1 (stepped down to 66kV) and the local 66kV have nothing in common with respect to phase sequence, yet they mist enter in parallel. I mentionned the trick of putting 1-to-1 "isolating" transformers to ~reduce~ the effects of the entry in parallel, but it does not eliminate the problem.
What can a phase sequence relay do when it monitors two active lines? Futilessly wait forever untill they become "in-phase"?
RE: Conditions to put primaries in parallel for MV
RE: Conditions to put primaries in parallel for MV
Therefore the AC-DC-AC link is cool, but i don't know any manufacturer - can you please point some? the powers in question are from 2 to 34 megawatts.
Thanks!
RE: Conditions to put primaries in parallel for MV
Synchronisers are available from most of the big manufacturers: Siemens, ABB, GE, Cummins / Onan, Brush, etc.
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