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What is the exact definition of a HV busbar short circuit withstand capability. If for example, after calcuation, we have a bus with a 3-phase symmetrical momemntray short circuit of 50 kA, how can we calculate the busbar short circuit withstand capability. Any IEEE references?

Do you have any idea where can I take a good course on electrical substation design in Canada? I tried to chck on www.epic-edu.ca, but they did not have this course.

I am trying to conduct a ground grid study for one project. Can somebody send me any grid grid layout so I know how it lokks like.

Hi guys, I was checking a single line diagram and it shows a motor of 17.9 MCA, 600V, 3-phase. What does MCA stands for and how is it calculated?

Does anybody have a template or a previous report for a harmonics analysis study and mitigation. I am trying to build my own template and I do need help. Thank you for your concern.

I have another question regarding sizing fuse. I have an MCC of 180 HP with an incoming feeder of 2 parallel runs 4-350 MCM Based on Canadian Electrical Code (CEC), Max Amps passing through this cable is 625 A and so is its permissible protective device rating. To size its fuse, the fuse...

Hi, We were adding a step capacitor bank (each 600KvAr) to one of our customers. Out technician was installing it was stepping in and out Capacitors simultaneously in a way that did burns the main transformer. Is there any suggestion what can be the cause of that? Note that the customer did have...

Hi, How does utility companies calculate the 3-phase, line to ground fault utility contribution to a facility, as well as X/R ratio. Suppose that this facility is powered from a 44 KV line and is 2000 KVA, 44kV/600V, delta-wye ground connected with a % impedance of 6%. Say the distance between...

Could you explain to me what is an electrical bunker in a 13.8 kV distribution system?

Hi, I am wondering how can I know exactly if I am in my facility and using a harmonic analyzer, if the harmonic levels I am measuring is coming only from this facility or from a neighbour sharing the same PCC( point of common coupling)? Should I power off my facility and start measure the...

Can anybody tell me why I do find in many designs a fuse in series with a circuit breaker? Is there many reasons to do that for protection?

Hello, I am wondering if anybody knows who is the manufacturer of CJ fuse and Parsley fuse? Thanks

Hi All, Is there any method to calculate or estimate cable length in a building based on the panel amps or transformers they connect? For example, I do assume cable length inside a panel are about 20-30 ft.

Hello, I am working on a project and I can not get the utility fault information or the X/R ratio. The utility is connected to a 27000/600 delta/ wye transformer, 2500 KVA with %Z of 5 and X/R ratio of 10. Is there any way to calculate the 3-phase utility fault same as the X/R. If not, is...