Recent content by blacklabs

A Westinghouse VCP-W 250 1200A 4.16KV breaker has a SC rating of 29kA and a C&L rating of 58kA. What does C&L refer to? Thanks for any assistance. Merry Christmas!!

Thanks to all.

Can someone explain the meaning of "Transformer Oil Power Factor". An analysis of our transformer oil indicated a sudden change in Power Factor that gradually began to recover. When we refer to PF, we refer to the relationship of real and reactive power. How does it equate with oil analysis...

Appreciate any input. At what point does lift oil solenoid 20QB-1 open and close? Thanks

You have been extremely helpful.One more question. In the first formula,is that "in" for inches? Thanks

In the Susceptance formula, what does the "f" represent? Thanks

I have to come up with a bunch of data for the System Operator. We've managed to pull most of the data together except for the "Line Charging Susceptance" of an underground cable. I'm not an Electrical Engineer so any help on how I can come up with this will be greatly appreciated. I've checked...

For the sake of argument, a section of bus is removed from service. Breakers are opened, disconnect switches are open and associated ground switches are closed. When restoring this bus, i feel ground switches should be opened followed by the closure of the disconnect switches.Is there a standard...

Thanks to all for the help!

Freeze protection for sections that may be isolated during maintenance. Thanks

In a closed loop cooling system designed to run at 50% Glycol/50% Water, the concentration has dropped to 30% glycol. How will this affect heat transfer capabilities. The temperature range for this fluid is approx. 60 - 120 degF.

160000/213000/266000 OA FA FA

I'm not an electrical engineer, but some one who has been given the task of finding this data based upon what appears on the name plate. Thanks anyway!

How does one calculate the Emergency Rating (MVA) of a power transformer?

Thank You