Since an induction generator only generates power, but not voltage, where's the voltage going to come from? Even with caps to supply vars, there needs to be a solid voltage source to get any meaningful amount of power out of the generator. Don't think that's something the VFD can do. But I...
I agree with Bill about the shield. A concentric neutral, might, maybe, be used as the ECG. Admittedly, it's been 20 years since I worked on the NEC side of the meter, but at that point there weren't any concentric neutral cables NTRL listed as 2 conductor assemblies. There were single...
There's a wide array of image sources and image qualities in Google Earth. Yes, there is undoubtedly a base of satellite imagery, but given the wide variety of sources and image quality it seems there's also a variety of elevations and focal lengths involved. If the image angle of power poles...
That's what they say. Ever actually pondered any of that imagery? If, for instance, the images are from satellites rather than vastly lower airplanes, why do the images of power poles tip soooooo far away from the base? Those images are from a few thousand feet at most. Certainly well below...
Ok, the pre-fault unbalance is just a real line in the non-textbook world. Your transmission provider doesn't do much transposition and I'm going to guess that you don't either. Nobody does the "continuous transposition" thing and so balanced 3-phase systems are a useful fiction but not found...
I'd be interesting in taking a look at it, you know how to reach me...
Is the line in question in the regional model? If not, enough of a model that I can connect it in would be helpful.
How do your Z1 and Z0 compare? I've never seen that much discrepancy between values arrived at using the more conventional rules of thumb and those arrived at using more detailed analysis. Any unmodeled ground sources in the neighborhood?
How big a system? The Western Interconnect has hundreds of dissimilar, random, generators all running in parallel with no particular problems… The Eastern might well have more.
The distribution phase conductors have very little to do with line impedance, but that neutral is just line any other "shield" wire. Include it in your parameter calcs the same way you would an overhead shield. Also, don't blindly assume rho earth is the conventional 100 ohm meters. I find...
From the test reports I’ve seen the transformer testing is done at ambient temperature and then corrected to the operating temperature. But those are in the size range of a few MW to hundreds of MW.
The image didn’t load for me, but looping cable in a vault means that when a termination or splice fails you still have cable to do it again without needing to splice in an extension. Termination/splice failures seem far more common than actual cable failures.
I don't know, 100ft right-of-way and a 150ft tall tree on the uphill side of the ROW. Fall-ins
I don't think I'd want to be dependent on those two lines in that weather...
Pretty sure they have interrupting ratings as well. But since there are interrupting devices that have interrupting ratings around 20kA or so indicating that the 20kA was a thermal (continuous current) rating rather than an interrupting rating removes ambiguity.
I don't know who might make them, but there are lots and lots of generator breakers on the low-sides of the GSUs. We used to have a 20kA generator breaker. 20kA as a thermal rating, not an interrupting rating. Plant was decommissioned a few years ago and the breaker's gone. Got other...
