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69 kV Cap Bank

69 kV Cap Bank

69 kV Cap Bank

(OP)
What limits you on how big of a cap bank you can install at a 69 kV switchyard?  I have 18 MVARS already at a switchyard and an 6 additional would help resolve a problem but I am being told that 24 MVARS is quite a bit on a 69 kV system.


 

RE: 69 kV Cap Bank

No enough information. 24 MVAR is "quite a bit" relative to what? What is the MVA and MW of the system?  

Rafiq Bulsara
http://www.srengineersct.com

RE: 69 kV Cap Bank

jeebusmn,

We have used capacitor banks  of 21Mvar, 69kV, with series reactor to reduce inrush current.
One of the criteria of sizing capacitor bank is to keep the steady state voltage variation below 3% when switching them.

Best regards,

H. Bronzeado

RE: 69 kV Cap Bank

Check that your switchgear is type tested for, and has an assigned rating for back to back capacitor switching.
Regards
Marmite

RE: 69 kV Cap Bank

(OP)
We don't have room at the switchyard so this isn't a possible solution anymore.

Our system peak is around 1450 MW.

I assume this 3% rule of thumb is only for banks that switch in and out frequently? I beleive that most of our cap banks our switched in or out maybe 2 or 3 times a year.



 

RE: 69 kV Cap Bank

Quote (rbulsara):

Not having room is hardly an electrical engineering problem.
Oh, but it is though.  Just as cost is a constraint, so is available space.  If it can't be built because of a lack of space, then it was a bad design that didn't consider all the project requirements.

RE: 69 kV Cap Bank

david:

Yes. Bad design..lack of creativity..all could be possible. I was just relating to the original question. The actual "problem" and "solution" is still elusive from the posting. smile 24 MVAR is peanuts compared to 1450 MW.  

Rafiq Bulsara
http://www.srengineersct.com

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