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Everything You Ever Wanted to Know About Phasor Diagrams - NCEES Electrical Power PE Exam
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- เผยแพร่เมื่อ 16 ส.ค. 2024
- Balanced ABC and ACB Phasor Diagrams:
Phase Voltage vs Line Voltage
Phase Current vs Line Current (Delta)
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Boy, phasor diagram has been one of my trouble headaches in my study. This is by far the most clearest explanation for me. It helps me clear up a lot of confusion on pos/neg sequence and unbalanced system. Most importantly, it helps me on what should be committed to memory and what can be derived from the rest since this is a lot at first.
Great video Zach! Now I know how to draw these in seconds! One note though, at the end in the lower right NEG (ACB) Delta, on the phasor diagram you just need to edit to show IA and IB vs what you wrote (IAB & IAC) (you said the right thing but wrote the opposite) :-)
Thanks @Brandon!
This video explains basics that are so easy to mess up. On the PE, NCEES predicts common mistakes. Angles are easy to mess up, and you can pretty much guarantee that your mistake is going to one of the answer options. After watching this video I redid the phasor diagrams on a sheet of paper to reference during the exam. It definitely etched it into my brain more. Thanks for the easy to understand explaination!
If you struggled with Phasor diagrams, Zach explains them here and it has definetly helped me understand them as opposed to looking at the in a book that is overly complicated, thanks Zach.
Understanding phasor diagrams is essential for success on the PE Exam. This lesson helps to clarify when and where √3 is appropriate.
Great explanation for anyone at any level of electrical study. Understanding phasors is a fundamental concept and this video provides a solid foundation.
This is a great visual representation of voltage and current relationships in wye and delta circuits. I never latched on to phasors in my college courses, but I'm all about it after reviewing Zach's videos.
Fantastic explanation of Phasors. Very useful to hash down a problem before you go about solving it. Thanks Zach!
very well explanation of phasor diagrams. I wish I knew about this class 2 years ago. Zach is a great teacher, motivator of PE exam preparation.
This was a great video because I didn't understand what I was doing wrong with Phase and Neutral angles. Good Job Zach!
Crystal clear! I practiced on my own every scenario and it makes perfect sense.
Great topic! It is very helpful in analyzing complex power system problems ex: phase shifting, relationship between line and phase values (current & voltage), etc. Zach is very knowledgeable and great teacher!
Very thorough and helpful. Illustrating the relationship between the phasor and windings was beneficial for my understanding
Zach has a thing for Phasor Diagrams, and trust me, it will help you make your way through those sticky problems, when it is hard to determine just what is going on. He uses the diagrams almost every chance he gets when solving problems for the P.E., and if you follow along, many complicated practices become very simple to visualize.
This is my go to video and I show that to some of the entry level EE’s.
In 19 minutes and 20 seconds, Zach covers college material that would have taken at least 2 classes to teach, and it is in a simplified form that makes a detailed and, at times, confusing topic easy to learn.
Thanks for the kind words Michael, glad to be of service.
Very detailed explanation for Phasor Diagrams, recommended to enroll in premium course.
Thanks Frederico
Given my EE degree was not power-oriented (aircraft powerplant and electronics emphasis), this discussion has probably been the most helpful. Zach, the lead instructor for Electricalpereview.com, does a very good job of not only explaining this concept well but also re-emphasizes those concepts consistently throughout the coursework so that the power phasor relationships begin to sink in. Through these courses those relationships have become second-nature to think through powerplants, distribution and load and those orientations and design implications have become very helpful in real-world practice.
Thanks!
Puts it in perspective. Helps understand angles between phase and line.
Thanks Grothe. I'm glad our online program was helpful to you not only to prepare for the PE exam but for real-world applications as well. We enjoyed having you as a student in our program.
What a great video. This is very helpful it helping me understanding phasor diagrams and how to properly use the sqrt. 3 + phase shift. Using the fundamentals described in this video can help me solve just about any problem dealing with phasors for balanced systems.
An excellent explanation for reviewing concepts for the PE exam. Especially the description of the distinction between Wye-Delta line and phase voltages, how they compare in magnitude and phase angle.
Glad it was helpful Damian. Good luck on the PE exam, we enjoyed having you as a student in our online program this semester.
Another great video to really drive these concepts home. Thanks.
You are most welcome Alison, glad it helped.
Thank you :)
Bro on your Y-connection the (+) ABC sequence rotation is CW and the (-) ACB sequence rotation is CCW right? just by following your lettering?? On your Vbc lead Vbn by +30 not by 120 degree right?
Appreciate you
My pleasure. Thanks for your comment and glad the video helped!
How do you multiply by an inequality?? (Around 5:30)
delta to wye or vice versa, always confuse me, but after your video it kick me, and it made more sence
Thanks Egis, glad it helped.
Can you explain more about how can weget sqr3 at 5:28
Phasor diagrams always get me in trouble. My biggest takeaway from this video is to draw it out everytime.
Pl explain how line to line voltage is leading phase voltage by 30 deg in star connection.
Line voltage will lead the phase voltage by an angle of 30º when the connections are in "star" or "wye" configuration because we are adding two phase voltages together of equal magnitude that have an angle difference of 120º like this:
If VAB is the Line Voltage measured across A and B, Van is the phase voltage measured across A to neutral, and Vbn is the phase voltage measured across B to neutral, then:
VAB = Van + (-Vbn)
VAB = Van - Vbn
If Van and Vbn are equal in magnitude and 120º apart, such that:
Van = Vp
Its good to listen you. If interested there are few more electrical Quires , related to phasor.
Sure thing, you are welcome to ask them directly here in the comments section.
In ABB diff 670 relay +/-60deg in 1st and fourth Quadrant is taken as region for internal fault protected differential zone. This is used for discriminating external fault/internal fault .pl explain
.Also if video and calculation for sloe 2, slope3 end section 1&2 with typical example are untouched . Pl enable the same.
Thanks for response.
While I welcome questions on this channel, the purpose of it is to cover topics on the PE exam. Your question, while it is a good one, is not one that would be covered. I'd suggest picking up a good relay protection book and diving more into detail.