11KV busbar short circuit rating and parallel operation of transformer

[rajapon]

Hi Guys


Ratings

11KV Busbar Rating=25KA for 3 sec

Operating voltage of the bus bar =11KV

Rated voltage of bus bar=12KV

Rated normal current of bus bar=2500

Power transformer rating =20MVA,33/11KV

In my S/S three transformers ,so in the 11KV incomer-3 & bus section-2 (5 breaker system)

Whether i can make all three transformer parallel with the closing of 3 incomers & 2 bus sections?

If all the three transformers in parallel at the time if any fault happens in the bus bar what will be the impact on the bus bar?

Bus bar have the enough capacity to carryout the fault current till the protection trip?

 

[ScottyUK]

You have not presented enough information to answer the questions.

1) Can you physically do it? Yes, unless interlocks prevent the condition. Should you do it? My guess is no, but insufficient information to say.

2) Maybe nothing. Maybe the insulators break and you get an explosion. Insufficient information to say.

3) Insufficient information to say. But my guess is no.


If you don't know what is missing I'm not certain you should be making decisions about HV plant.