I have only had one of these done and I would like to know what you consider the minimum deliverables that you would want. We just got a paper report and the labels but I thought we should have received the electronics files from the analysis as well. Is that unreasonable? The next time I asked...
Thank you all for your comments and knowledge. Further investigation showed they have separate 6000 amps busses feeding each side of the switch gear so one transformer per side as you suspected. The utility input is 25,000 volts but that is not confirmed by the utility yet. The 6000 amp busses...
That is what they tell me and the spare pad with conduit goes back the the main bus. Looks like we will need to upgrade the main switch gear. Their previous short circuit study they had done showed 53,000 amps available fault current and the GE AV5 panels boards and Power Break circuit breakers...
Customer has a building currently fed by a single 2500kva transformer. They planned ahead for load increase and there is a pad for a second 2500kva transformer. These are connected to the dual feed utility on the primary side with S&C switches with the PMH-9 connections, one source transfer and...
IRStuff, The new loads are significant and require a demand factor I am not sure the customer will meet. The engineer in charge believes the old building ran 45%. I have to believe him because he was present.
I am designing power distribution on my first semiconductor fab. The building was purchased from another manufacturer and the engineer for that company specified 200% neutrals, K13 transformers and both isolated and non-isolated ground wires to the panels in the fab areas. The current owner is...
I ran into some industrial saws that I think are not properly wired. It has a transformer wired for 480 volt primary and a 240 secondary and that is all well and good. However some of the controls on the inside use 120 volt coils and there is no connection to x2-x3 on the secondary so they have...
All of the graphs have been data collected by the controller. Zone output is the SCR power output going to the heater element. There are multiple RTDs sensing temperature in 8 different major zones and 4 minor zones around the transition area. The heat up rate is limited because two of the...
Here is a chart showing the input 480 voltage and the DC heater power on different units and zones. The furnaces were custom made in house 30 years ago because they couldn't find one designed for the job. The controls have been upgraded, heater elements get changed out regularly but the basic...
Furnaces are 48kva and heat to ~1200C. Voltages/power matter because the liquid/solid interface is held to within +-.01 C of the melting point or as tight as they can get it. It is hotter toward the liquid side and cooler on the solid side by a few tenths over a few feet. The 5 volt tap change...
Thanks CR. The crystal furnaces are for growing exotic semiconductors and the temperatures need to be controlled to tight tolerances at the molten/solid interface to ensure a uniform crystal lattice orientation. It takes a few weeks to run and unlike the silicon and germanium crystals usually...
Hi, to start my degree is in micro electronics so power distribution isn't my strong suit despite working through college as a journeyman. The journeyman stuff was why I have been asked to look into this.
Anyway, on the 480 volt power to some of our crystal furnaces we have some regularly...
