Separate Sources in Parallel?
Separate Sources in Parallel?
(OP)
Is there any repercussions in placing to separate sources in parallel like in the case of a double ended switchgear fed from to separate external utility sources (say Utility #1 and utility #2)..two separate circuits. Most of the utility interconnections I encountered so far was in the form of a ring connection and two lines enter a substation.






RE: Separate Sources in Parallel?
RE: Separate Sources in Parallel?
RE: Separate Sources in Parallel?
I've seen this done on a temporary basis, but only under direct supervision of the utility operations folks.
RE: Separate Sources in Parallel?
1 The 2 sources MUST be in phase a.k.a. in synchronisim
2 You will substaintially increase the amount of fault current. You must make sure your switchgear can handle it
3 If the 2 services are fed from transformers then the transformer impedances must be the same. If they have LTC's you will need joint control for them
3 For faults beyond your system, the fault current would flow thru your switchgear bus. You should install directional overcurrent relays to sense this condition and open the faulted feeder
RE: Separate Sources in Parallel?
RE: Separate Sources in Parallel?
What Alehman said.
It will be problem with same utility, Substation feeded from separate substations of same utility.
Regards.
Slava
RE: Separate Sources in Parallel?