embeded generator on the utility feeder
embeded generator on the utility feeder
(OP)
I ran some models with embeded generation on utility feeder and I found that SC level seen by the TS relay protection remained constant.
However I came across some papers that say relay will see SC current decrease with new generation connected downstream on the feeder. This doesn't make sense to me.
Any comments?
Should I expect TS relay to see more or less curent for baulted 3phase fault with generation on?
However I came across some papers that say relay will see SC current decrease with new generation connected downstream on the feeder. This doesn't make sense to me.
Any comments?
Should I expect TS relay to see more or less curent for baulted 3phase fault with generation on?






RE: embeded generator on the utility feeder
RE: embeded generator on the utility feeder
What is an "embedded" generator?
RE: embeded generator on the utility feeder
To clarify:
Embeded generator is generator that normally work in parallel with the grid.
TS relay is Transformer Station relay, this is first upstream protection of the feeder with embeded generator
RE: embeded generator on the utility feeder
For coordination purposes, you will need to look at both fault conditions.
RE: embeded generator on the utility feeder
CODE
----> | ---->
ITS | IF
| ^
Z2 | IG
| |
|
G
RE: embeded generator on the utility feeder
Could you please explain.
Regards.
Slava
RE: embeded generator on the utility feeder
thanks a lot.
So it is not that impedance will be apparent for the relay in the TS, but also overcurrent protection will be measuring apparent current which is less then the current that the same relay measures w/o the generation. Great !
RE: embeded generator on the utility feeder
RE: embeded generator on the utility feeder
Use the diagram in my previous post and take an oversimplified example. Put a 150V source at both G and TS, tying the negative side back to the fault location X. Make all impedances 10 ohms. Without G, the current ITS = IF = 150/(10+10) = 7.5A. With G, the G and TS sources will be in parallel, IF = 150/(10+10/2) = 10A, half (5A) will come from G and half from TS.
RE: embeded generator on the utility feeder
Thanks a lot.
Haha, with time we forgot also ohms law and parallel connection of resistors
Regards.
Slava