Operating 230 kV Breakers at 115 kV
Operating 230 kV Breakers at 115 kV
(OP)
We have been directed to purchase 230 kV breakers for operation at 115 kV. The thought is that in the future the system will be upgraded and it won't be necessary to purchase new breakers.
It is a generally accepted practice around here, apparently, and I was hoping for any comments from others who might know of some red flags that we should be aware of.
Actually, I'm hoping there aren't any red flag comments....
It is a generally accepted practice around here, apparently, and I was hoping for any comments from others who might know of some red flags that we should be aware of.
Actually, I'm hoping there aren't any red flag comments....






RE: Operating 230 kV Breakers at 115 kV
If the switchyard does not encorporate the correct distances, structures, and bushings needed for the higher voltage, you may have trouble later when you switch over to the higher voltage.
RE: Operating 230 kV Breakers at 115 kV
Are clearances/creep/strike dimensions intended to be initially 550 or 1050kVBIL? What about arrestors and instrument transformers?
RE: Operating 230 kV Breakers at 115 kV
RE: Operating 230 kV Breakers at 115 kV
Some power transformers and auxiliary service units could be designed for dual voltages for extra charges. Provision for modest investment replacing little equipment should be considered. Some of those equipment are surge arresters and voltage transformers (PT or CVT).
One of the biggest challengers could be the setting and coordination of the protection system to minimize the downtime during the transition from 115 kV to 230 kV. Therefore, a good plan in advance is strongly suggested.
RE: Operating 230 kV Breakers at 115 kV
RE: Operating 230 kV Breakers at 115 kV
RE: Operating 230 kV Breakers at 115 kV
In general the switchyard and the entire equipment should be deisgned for 230kV. If this is so then what is your concern.
The only concern I have is that the extra $$$ you are investing with an intention of future expansion program has no return. Therefore you must do an investment analysis and include all the costs and benefits for this project. Who knows in two years time the cost of 230kV gear may be reduced by x%. Just a hope?. Plus the $$$ would have depreciated in two years time at the discount rate. Therefore an investment analysis is a must act for investments.
Kind regards