What are the advantages and disadvantages of Universal Angle Bus Conductor (UABC) compared to tubular aluminum bus for medium or high voltage substations? Does anyone have any links to UABC bus details like bus supports, connections, etc.?
One of our clients had a 65KS fuse in a 12.5 kV open type cutout "vaporize" instead of blow and drop out. No evidence of a fault was found. Could this be caused with load current by the link being improperly installed, perhaps not secured under tension? The fuse had been initially installed...
We were trying to capture capacitor switching transients on 4 kV metal-clad switchgear using an Electro Industries Nexus 1500 meter. With the transient voltage trigger set at 175% of nominal, we got a large number of transients before we were able to switch the capacitors. There were so many...
One of our municipal utility clients had a ground differential trip on their peak shaving generating plant recently. The generator is diesen engine driven, 1825 kW, paralleled with two other identical generators and with the utility system. The trip occurred 25 minutes into the run and was...
A Florida Power & Light crew, putting in lines for an addition to the Orlando International Airport , found the following in a culvert they were using...
The gator is/was 18' 2" long.
The rattlesnake roundup totaled 87.
We thank Florida Power & Light for sharing these pictures.
Our client has a 2000 kW diesel generator connected to the 34.5 kV system through a 2500 kVA, 480 volt grd-wye to 34.5 kV delta, transformer. The generator is wye connected with the neutral connected to the transformer neutral, grounded at the transformer only. There are no phase-to-neutral...
One of our clients had a tree fall on an overhead 12 kV line, breaking two phases. Four spans toward the substation, two conductors of the same phase broke and fell to the ground. We suspected that the initial fault (3300A) caused the phases to slap together on the other span causing a burn...
Does anyone know what company has taken over the old FPE power transformer business? I am trying to get current transformer data for a 1983 vintage Federal Pacific/Reliance Electric 69-12.5 kV, 12 MVA power transformer.
I am analyzing the grounding of a 911 center served from a 12 kV distribution line. I have calculated the Ground Potential Rise (GPR) of the ground system for a 12 kV fault at the transformer pole serving the center. I am using SES MALT and FCDIST software. MALT calculates the ground...
I agree that the old "Big Blackout. What Happened" thread has become unwieldy. A very informative article was just posted on the IEEE Spectrum website.
http://www.spectrum.ieee.org/WEBONLY/special/aug03/black03.html
Anyone work for a US utility that leases MV OH lines either to another electric utility or from another electric utility? I don't mean joint use poles, but the whole thing, wires and all.
We are working with a client that is considering proposing a buyback/lease arrangement to settle a dispute...
One of our municipal clients had a situation where someone shot one phase on their wholesale power supplier's 100 kV transmission line serving the client's 100-25 kV substation. The phase opened but no trip occurred, leaving a phase open on the primary of the delta-wye transformer. In this...
