I know you do not operate an SF6 breaker if gas pressure is low, but assume dead tank SF switch where there is at least a little positive pressure:
a) Is there a gas pressure level where there a risk of an internal line to ground fault?
b) If the breaker is open, is there a gas pressure where...
I am doing some short circuit and TCC studies for a customer using SKM products. The customer asked me to put cable damage curves on the TCCs. They have 90C THHN/THWN PVC 600V cable in general. SKM has buried in thier default databases a damage temperature for cable of 150C, yet I can find no...
Can anyone tell me how fast a shunt trip device opens a 480V breaker, typically anyway? I assume it varies with design. Do any designs reliably trip in < 5 cycles? Can anyone send a link to a shunt trip spec sheet showing trip times?
I have a collection of 480V MCCs fed by 480V power...
We are adding a 2nd 150/280MVA auto-xfmr to a 230/115kV substation. The xfmrs are to be run in parallel. Each has a delta tertiary. Through fault impedances are nearly identical on a 150MVA base. The intent is for each xfmr to be on taps so that ideal voltage ratios are identical.
There is one...
Can people suggest a manufacturer of xfmr tap changer controls for large autos in high voltage applications, that supports xfmr paralleling and master-follower arrangements? I want SCADA to be able to remotely sets the tap of one xfmr, and I want the tap on the parallel xfmr to blindly follow...
