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#129523 - 04/12/05 09:54 AM increasing primary voltage  
rmiell  Offline
Member
Joined: Nov 2000
Posts: 242
La Junta, Co. USA
What effect, to the secondary voltage, will increasing the primary voltage produce? Our utility is looking to increase our distribution voltage from 13.8kV to 14.4kV (recommended by an electrical study). As long as the transformers are rated for this voltage, will the secondary voltage be increased enough to warrent looking into? We should be able to lower the taps if necessary, but will it be necessary?

Just wanted to get some basic info, as this will be engineered.

Thanks

Rick Miell


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#129524 - 04/12/05 01:48 PM Re: increasing primary voltage  
BPiersel  Offline
Member
Joined: Jan 2005
Posts: 18
Minnesota
The secondary voltage is proportional to the primary voltage. So, for example, if the current output is 480 V, the ratio is 13800/480=28.75. At 14.4kV, the output will be 14400/28.75=500.9 V.

A simple equation you can use:

New output = (Current output/Current Primary) * New Primary


#129525 - 04/13/05 08:20 AM Re: increasing primary voltage  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
It's a 4.3% increase in voltage. I would think that you need to allow for possibility of the secondary exceeding the upper tolerance limit under low-load conditions and adjust the taps accordingly.



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