Phasor Diagrams for Wye Balanced and Positive (ABC) Sequence Systems (ELECTRICAL POWER PE EXAM 2022)
ฝัง
- เผยแพร่เมื่อ 13 ก.ค. 2024
- Learn how to draw phasor diagrams and answer exam problems for a wye connected balanced and positive (ABC) sequence system for the Power PE Exam.
0:53 - Starting with the Given A Phase Voltage (V_AN)
1:03 - Calculating the B and C Phase Voltage Magnitudes |V_BN| and |V_CN|
1:34 - Calculating the B and C Phase Voltage Phase Angles (θ_VBN) and (θ_VCN)
4:13 - Why Negative 200 Degrees (-200º) is the Same Thing as Positive 160 Degrees (+160º)
6:40 - Drawing B Phase Voltage (V_BN) and C Phase Voltage (V_CN) on the Phasor Diagram
8:02 - How to Convert From Phase Voltage to Line Voltage
9:03 - Calculating the Complex A Line Voltage (V_AB) both magnitude |V_AB| and phase angle (θ_VAB)
10:00 - Calculating the B and C Line Voltage Magnitudes |V_BC| and |V_CA|
10:24 - Calculating the B and C Line Voltage Phase Angles (θ_VBC) and (θ_VCA)
12:53 - Drawing the A Line (V_AB), B Line (V_BC), and C Line (V_CA) voltages on the phasor diagram
Did you know that just one single voltage quantity is needed to determine all remaining voltages (A, B, and C line-to-neutral voltages and A, B, and C line to line voltages) for a wye connected balanced and positive ABC sequence system.
This video will show you how to start with just one voltage, then quickly calculate the remaining voltages while drawing the results on a phasor diagram.
This video was recorded live in January 2022 during our live class on Circuit Analysis for the NCEES® Power PE Exam.
Click the links below to learn more about the fastest growing online class for the NCEES® Electrical Power PE Exam located at www.electricalpereview.com
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Table of Contents:
0:53 - Starting with the Given A Phase Voltage (V_AN)
1:03 - Calculating the B and C Phase Voltage Magnitudes |V_BN| and |V_CN|
1:34 - Calculating the B and C Phase Voltage Phase Angles (θ_VBN) and (θ_VCN)
4:13 - Why Negative 200 Degrees (-200º) is the Same Thing as Positive 160 Degrees (+160º)
6:40 - Drawing B Phase Voltage (V_BN) and C Phase Voltage (V_CN) on the Phasor Diagram
8:02 - How to Convert From Phase Voltage to Line Voltage
9:03 - Calculating the Complex A Line Voltage (V_AB) both magnitude |V_AB| and phase angle (θ_VAB)
10:00 - Calculating the B and C Line Voltage Magnitudes |V_BC| and |V_CA|
10:24 - Calculating the B and C Line Voltage Phase Angles (θ_VBC) and (θ_VCA)
12:53 - Drawing the A Line (V_AB), B Line (V_BC), and C Line (V_CA) voltages on the phasor diagram
Make a video explaining negative sequence too
Here is an older video on negative sequence available on our TH-cam channel: th-cam.com/video/tvbW5xO5bpE/w-d-xo.html
While it's not as high quality as the videos available in our online class, it's still extremely helpful if you are trying to get more comfortable with ACB negative sequence.
Why do the line voltage phases have 30 degrees added to them. Where does this phase shift originate from - thanks?
Hi Steve, it is explained in this older video on our channel:
Where Does the Square Root Three (3) and 30 Degree Phase Shifts Come From? Phase vs Line Voltage NCEES Electrical Power PE Exam:
th-cam.com/video/kRhvm5sEsTc/w-d-xo.html
There is also an article I wrote as a guest post for a friend's website that explains it here:
relaytraining.com/the-complete-guide-to-the-square-root-of-three-in-power-calculations/
@@electricalpereview Great, thanks!
why does the line voltage lead by 30 degrees. where did you get that from?
I'd like to know that as well.
It's due to Kirchhoff's Voltage Law and vector addition. I explained in this older video on our channel:
Where Does the Square Root Three (3) and 30 Degree Phase Shifts Come From? Phase vs Line Voltage NCEES Electrical Power PE Exam:
th-cam.com/video/kRhvm5sEsTc/w-d-xo.html
There is also an article I wrote as a guest post for a friend's website that explains it here:
relaytraining.com/the-complete-guide-to-the-square-root-of-three-in-power-calculations/
ON Vbc, you added 160+30 to get 190 then subtracted 360 to get -170, so why didn't you do that on Vca?