Found much interesting comments and discussions on X. Getting to be my go to source - but still being careful. Center core column structure and flat slab construction. Similar to construction in the 60's that I am familiar with.
Viewed a very long apparently government report yesterday on Youtube. Cannot find it today. Very critical of the situation. Apparently AI composed as I have never seen such a complete report this soon. I searched YouTube and Perplexity for the report; maybe there are better sources some...
The latest ASCE 113 Substation Design Practice Manual has a chapter on different kinds of protection walls for collateral damage from explosions. Also most current transformers are designed for the cover to explode upward before the side wall panels.
Bingo. Old substation (transformer?) and 106.2 percent of capacity! That's a sign for extreme degradation of the coil winding insulation and is discussed (WARNED) in a number of IEEE Transformer publications. There may have been a short circuit that was the final straw.
Initial question: How old was the transformer? Did the coil windings have a permanent compression system? A few years ago there was a 30 year old transformer that burned at a Houston substation. Transformers do not run forever and there should be a remove from service plan in place. These...
And the anchor bolts have to account for the thermal expansion of the ring plate. So the holes have be larger and the connection of the bolt some where above the ring base plate. If the bolts have to resist uplift, we usually will add in a small P-delta moment/S to the tension force of Pt/A.
If it is a core clamping issue or a windings clamping issue, do you know if the clamping system on the windings has some sort of a hydraulic compression system? The coil stack column may have shrunk due to degradation and now is loose. Helpful if we know the age of the transformer and whether...
When the electrical engineer designs the transformer coil windings assembly, the physical design is for the wind assembly not to fly apart when a fault goes through the system. For axial loadings of the assembly, he provides a force value that the tie rods must resist - say 300,000 lbs. This...
Raj6:
I am the EOR on a number of tall flagpoles.
https://en.wikipedia.org/wiki/Aqaba_Flagpole
Your latest summary of the criteria required for the design is very good and is what I used on my “monster” poles as these flagpoles were initially called. Today the highest flag pole is the Cairo...
Once before I said some of these things - but my introduction to big numbers for multiplication and division was a about a 3" thick logarithm book that required looking up large numbers and just adding them together and then getting the result from consulting the book. (1961) Remember putting...
IEEE 693 concerns the seismic design of substations including transformers. The California PUC requires that transformers are able to operate during an earthquake and continue operation. The document does not consider degradation of the insulation and what condition the insulation is when the...
Could you hold the approval until the special solution is provided to you for approval as per the contract? I have had the concrete trucks sent away because the geotech and I were having an argument. Can get messy.
