Paralleling Transformers
Paralleling Transformers
(OP)
What are the effects of operating two power transformers of different impedances in parallel?
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RE: Paralleling Transformers
-nag400
RE: Paralleling Transformers
Paralleling transformer seen to be a hot topic in this forum.
Please see the enclose threads that address similar question: Thread238-7093 Thread238-16427 Thread238-30275
A related topic could be the phase shifting transformer use to increase the power flow in a paralleling situation. The following thread has good reference Thread238-27103
RE: Paralleling Transformers
A couple of added comments... If the transformers are not in close proximity, the system’s line-impedance characteristics will affect circulating current also.
It may be obvious, but circulating currents will present a highly reactive load to the source, and will exist regardless of loading.
RE: Paralleling Transformers
please put your values (i.e. uk,Sn,S)in to
basic formulas given here under and calculate the loads shared by transformers.Then you will see the effects.
uk = S /((Sn1/uk1)+(Sn2/uk2)) [total imp.of parallel tr's.]
S1 = S*(Sn1/Sn)*(uk/uk1)
S2 = S*(Sn2/Sn)*(uk/uk1)
where;
Sn1;uk1 = rated power;imp.of TR1
Sn2;uk2 = rated power;imp.of TR2
S1,S2 = load shared by TR1,TR2
S = existing load fed by parallel transformers.
Sn = Sn1+Sn2
RE: Paralleling Transformers