Y Start-Delta Run Reduced Voltage Starters (Full Lecture)
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- เผยแพร่เมื่อ 28 พ.ย. 2015
- In this lesson we'll examine Y start-Delta run reduced voltage starters designed to limit inrush current and reduce mechanical stresses to the driven load. Y start-Delta run reduced voltage starting methods are suitable only for fully customizable motors in which both ends of an individual winding are accessible (ex: 6 and 12 lead motors). The Y start mode exposes the windings to the comparatively less line to neutral voltage, whereas the delta run mode exposes the windings to the comparatively higher line to line voltage. Y start-Delta run reduced voltage starters are characterized by an open transition from start to run in which the motor windings are briefly deenergized. (Full Lecture)
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All the ridiculous books I have and none of them make it so crystal clear. Thanks Jim
Just starting to try and get a deeper understanding as I try and run a 3ph spindle moulder on a static converter. Really good videos really well communicated. Thanks Jim you provide a lot of good information and present really well.
Great Job Jim.Thanks for driving home the importance of considering motor inrush current.
Thank you so much instructor Jim. The video is really informative.
How much resistance for Closed Transition ?
Other than inrush current properties, why are motors configured to operate in wye over delta or vice versa? You showed in the graphs that a wye configuration draws less inrush current and less current at rated full load... so why wouldn't you just stick to a wye configuration?
More electrical power in means more mechanical power out. Given the same supply voltage and same windings a Y configured motor consumes less electrical power and produces less mechanical power, conversely, a delta configured motor consumes more electrical power however produces more mechanical power.
I still don't get it. I understand that Y configuration reduce voltage on winding but how does it reduce inrush current? According to plate on my motor (IE1-Moteren Type FCY 71A-4) in Y(230V) current is 1.31A and in Delta(400V) current is 0.75A (at working point). So how it is possible that more current demanding configuration take less in rush current?
+kfh13 Two points that might clear up the confusion:
1) Line to neutral voltage is lower than line to line voltage. When a winding with constant resistance is hooked to the lower voltage line to neutral voltage it will draw less current. When it switches over to delta mode, the winding will draw more current .... however ... the INRUSH current during Y configuration will be less than what it would be in a delta configuration. Check out the 20:00 marker using the graphs for clarification.
2) Remember that nameplate FLA is a snap shot at rated torque and speed. When producing the nameplate mechanical power in a Y configuration with less voltage, current must be more. When producing an equivalent nameplate mechanical power in a delta configuration with more voltage, current will be less.
Hope this helps!
How can the steady state AMP NOT be equal ?
Hy Jim, did you put together the lecture including the timer? I cannot find it 😫
Here you go: th-cam.com/video/aCDD_IHUnro/w-d-xo.html
@@bigbadtech I appreciate you 🙏, do you have a Patrion account? Would love to contribute to your channel. I do benefit greatly from it.
After much kicking and screaming I finally did set up a Patreon account: www.patreon.com/bigbadtech Super appreciate the support! Stay in touch. Once I finish fixing the Basic Electricity and Electronics 1: DC Circuit Analysis playlist I've got a bunch of new material coming your way.
Do you have auto-transformer starters? and connection diagrams?
No, however, that's a good subject. I should do a lecture on auto-transformers and auto-transformer starters.
Jim Pytel thanks for considering this topic
Jim Pytel can you do Y-Delta motor starter and it’s connection diagram too?
Y Start Delta Run: th-cam.com/video/DpB-kdM2RA4/w-d-xo.html
Motor Connection Diagrams: th-cam.com/video/XsL1o4Lm7wg/w-d-xo.html
You did not properly label and show Neutral while the wye configuration is enabled. (very frustrating for someone new to this concept)
Also, Great video!
:)
Sorry for the confusion. Check out the "Balanced Y Configurations" lecture at: th-cam.com/video/8RHetyPxp0Y/w-d-xo.html Ideally a balanced y configured load (like a motor) does not necessitate a return line via the neutral.