Why Reactive Power is Necessary ? | The Best Explanation | What is Reactive Power ?
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- čas přidán 26. 03. 2020
- Why Reactive Power is Necessary ? | The Best Explanation | What is Reactive Power ?
Is Reactive Power Useless ? | What is Reactive Power ? | Reactive Power Compensation
The Engineering and Science students find hard time to understand the concept of Reactive Power in Electrical Power System? Many say, Reactive power is useless power as it does not contribute to any real work.
Considering the interest on this topic among student community, we , Build the Basics CZcams channel, have thrown some light on the concept of Reactive Power.
The generating stations generate electric power and it is transmitted to load centers using transmission lines and to each customer through using power distribution network. In this process, the power generated by the generating station is not fully consumed by the loads. There is some power loss in the transmission and distributed system due to the line internal resistance, R. Current, I, flowing through these lines results in power losses. You cant avoid the current flow due to the power demand in the load centers. On top of that additional currents due the reactive nature of the transmission lines and loads will result. This will increase further losses in the transmission lined and also voltage drop across the line. This is the drawback of this additional current due to reactive power.
Then What is the advantage of the reactive power ?
Cant we avoid this current additional current in the transmission lines in the process of availing the advantage of reactive power ?
The answers to these questions are given in this video.
Don’t forget to subscribe to this video and click on the bell button to watch such interesting videos in future.
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Also, reactive power is useful for induction generators that do not have an external excitation system like sync. generators. The presence of Q in the rotor and stator windings provides a magnetizing current that establishes the rotating magnetic field in the rotor. That rotating magnetic field cuts the stator coils, which induces a voltage (electromagnetic induction), that results in current flowing in the stator coils. The stator is connected to the grid so this product of current and voltage is the power delivered into the grid.
Extremely useful. These simple facts are never written in any textbook in a simple manner as you explained in this video. I did study numerous books, but this 9 mints video made me clear. Thanks a lot for your service in disseminating your knowledge.
Thank you very much! I am trying to understand why, when I run a load flow simulation, the bus voltages are less than nominal without reactive power compensation and then why adding compensation props them back up. This was very useful!
I now understand that there is leading AND lagging reactive power. This use to confuse me. Great video and explanations- thank you!!
How reactive power produces magnetic field
Finally a satisfactory explanation of this topic!!! Thank you very much :)
Glad it was helpful!
Hey! Thank you for this video. Subscribed.
Great video
Before watching this video, I know is useful for voltage control. You can control voltage by varying active or reactive power. However, active power is what consumers pay for, hence we choose to control voltage with reactive power. Another important fact is that you can use reactive power either for power factor compensation, or voltage control, but not for both
Very well explained.pls make videos on more topics. If possible try to make videos on basic components of electrical engineering. We go through books, we get the things but practically how it works that we don't know. You have made it clear wid the help of presentation. Thanx alot..
Sure. Thanks
Helpful..
Thank you
You are welcome
Beautiful explanation
Thank you sir,Actually it's a final viva question to me in my B.tech final project. I answered to this question briefly but here I got full information.thank u so much😊😍
Hi Chandana, Glad to know that it helped you.
👍
Well explained and thanks
Glad it was helpful!
Nicely explained..
Thanks,Aadil. Have you watched other videos in our channel,? We appreciate your feedback.
Well explained.😀
Glad you liked it
Good
Thanks
Thank you sir 🙏😊
Thank you sir your explanation from basics are very good
What happen to the grid if supply more reactive poWer?
When you overcompensate reactive power locally by using FACTS devices or shunt capacitors in a transmission or distribution system, it does the same effect as the (Ferranti effect), so to speak, where voltage can increase beyond grid code requirement (voltage instability). If from the generation side, where a synchronous generator is overexcited (i.e., injection of reactive power into the grid), it can cause overloading of lines or transformers because P & Q can compete to flow in a specified line (with limited line flow limits), which can largely reduce efficiency. That is why the power factor is usually monitored to understand the P-Q ratio. The flow of a large amount of Q will incur more reactive losses thus, results in voltage drops. You will realize here that I said earlier the injection of Q increases voltage, and now, I'm saying the flow of Q reduces voltage. YES! That is because Q is usually compensated locally and is not allowed to flow in the grid, although a minimal amount can flow as injected by synchronous generators - that means the exact amount of Q required must be compensated or provided locally to avoid overloading or voltage issues. Generally, in power systems, we can't say one thing that can be seen as a fixed solution, but it changes depending on the application.
Thanks sir
All the best
thanks
Thanks to you too.😊
How does dc motor field gets energized since supply is dc voltage and thereby no reactive power????
For any dc motor, if you model the field winding, then there is a winding resistance and an inductor which models the coil which produces the magnetic field. When a DC power source is connected to the field, think of DC power source and the winding as an RL circuit. Active power is I^2*R, and reactive power which is now converted as magnetic field is given by 0.5*L*I^2. I think this the formula. Active Power and Reactive Power are basically AC concepts. Applying them to DC is technically not correct. But this is an explanation based on those lines.
A current carrying conductor produces magnetic field around it. I think Reactive power is not needed to produce field.
@insearchofpeace2151 It's not the coil that produces magnetic field. Any conductor which carries current produces field.
Yes
I want ppt for this subject
Please, make video on induction generator working principle.
Sure, Tasnim. We will make it soon.
Thank you
is it possible to convert the reactive power to real power and if yes how ?
motor,ThenGenerator.
No it is not.. reactive power is also known as imaginary power.
PPT sir yes
👍👍👍👍👍👍😄😄
Upload more videos sir
Will upload soon
0:15 Basic question??? Perhaps for you it is, but not for many of your viewers. It doesn't sound very sympathetic to me.
Please send
Reactive power is imaginary. And imaginary power is useful only in simplfying the calculations.
Trying to understand what reactive power is same as trying to understand what sqrt(-1) is.
Watch this video fully
"Imaginary" doesn't literally mean that it doesn't exist, it means it is a vector quantity, having a magnitude that exists in a time domain. If inductive or capacitive reactance was "imaginary" then we wouldn't have to compensate for it.
Pl correct spelling of field
Too bad explanation...
I haven't seen this kind of worse explanation