pls help for this

[mhalarjani]

Hi can any one help pls.

I have mv cb provided by oc/ef relay supplying dist transformer.

When main feeder trip this cb also trip for information this yransformer on seprate feeder but from one main sustation.

Thank you

 

[Skogsgurra]

You are welcome!

WHAT was the question?

Gunnar Englund

http://www.gke.org

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Half full - Half empty? I don't mind. It's what in it that counts.

 

[mhalarjani]

Sorry for all

I have RMU switchgear connected to transformer 500 kva (package sustation)

And this substation getting supply from main distrbution feeder 11 kv

My question :

When some feeder from the grid station trip the package substation CB trip?

Why the circuit breaker which connected to transformer trip due to other main feeder trip?

I hope my quiestion is clear.

Thanx all.

 

[mhalarjani]

this is sketch for my quz

when feeder 1 trip the transformer 500 kva trip also.

 

[collies99]

Is there an under voltage relay in the cb control at the 500 kva unit ?

Is there any targets ?

 

[mhalarjani]

thanx for reply

no the device which installed over current and earth fault only .
and the transformer load almost 90 % of nominal capacity .

 

[slavag]

What transformer protection was operated, overcurrent or earth fault?
What type of relay is installed, what settings of overcurrent and earth fault.
what Uk of transformer? and what type of load on the transformer ?( maybe motors).