Recent content by jakesaround

Isn't this the Blackburn book? https://manautomata.files.wordpress.com/2016/02/protective_relaying_principles_and_applications_blackburn.pdf Cheers

Thanks Zach, this helpful. Jake...

I would say in general it would be a 4 wire service with one wire being the neutral conductor and a separate case/equipment ground point.

Not all three phase services have a dedicated ground wire, that's correct. Will a three phase chiller have a ground? Most likely it will always have a case ground and a four wire service with a neutral conductor. Case ground protects the equipment and workers from damage and electrical shock...

That drawing could indicate a 3 phase delta transformer with a center tap winding or it could be a diagram for a 3 phase motor. Not all delta transformers are going to have the 4th wire "high-leg" which is the center tap ground/neutral conductor. That is a variation that can be used when...

The answer is maybe, yes, and no. It really depends on the type of connection you have to the chiller, delta or wye. If it is a standard 3 phase wye connection you would actually have 3 hot conductors 1 neutral and a separate ground connection. If it were a typical delta connection you would...

Thanks for taking the time to work on this. I did kinda leave you hanging out there without the solution but I know you enjoyed the challenge. :) And don't worry about any embarrassment we are all here to help and learn, and I appreciate your help. The correct answer is D and here is how they...

DK, Yes I think you have helped but for your benefit and others here is the full problem. Maybe you can take some time to work through it and help me gain some deeper understanding. NCEES #531 The figure (use your imaginations :) shows a 500-kV (line-to-line voltage) transmission line...

I am in need of some help understanding this problem. Can someone comment on bacchi's answer, is this correct/incorrect? It doesn't seem to make sense with my understanding of how to calculate vars. Thanks.

Thanks Flyer, I think it was the parallel conductor that was throwing off my final answer.

Hey all, its me again. Here is probably an really easy question but I don't recall how to solve can you help? This is taken from the 2009 NCEES Electrical Power Sample Questions #512 This is an NEC question but looking up the information in the code book I understand. The question is...

Thanks all. That helps alot.

The solution according to the study guide is as follows; A: The Vars will vary as the square of the applied voltage. System Voltage KVAR = (-----------------------)^2 * (kVAR) Capacitor Voltage 12,470 volts KVAR = (-----------------)^2 * (600kVAR) 13,800 volts KVAR = 489.92 kVAR The...

I am taking the Electrical Power exam in October and I have been studying a bit. Here is a question/concept that I need some help on. If I have a 3 phase capacitor rated at 13,800 volts and 600kVar and I apply it to a 3 phase system rated 12,470 volts how many vars will be applied to this...

Hey Everyone, I found this presentation while browsing the web looking for good tidbits on the PE exam. http://www.sfpe-dfw.com/presentations/The%...20and%20You.pdf This presentation is in reference to the development of the Fire Protection PE Exam but it definitely rings true to the...