![Georg Schett](/img/default-banner.jpg)
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Georg Schett
Switzerland
Registrace 2. 09. 2019
Tutorials about electro engineering fundamentals based on online Electric Circuit Simulation Program. For apprentices, students, teachers and engineers. It's all mathematics.
Traveling wave propagation on transmission lines and in cable.
To use the background simulator yourself go to www.ecsp.ch. This video is about traveling waves propagation on High Voltage power transmission lines and about the model ised in modern simulation tools. Watch more videos: czcams.com/channels/ZEYX01Nvi3qHsby1Cnls1g.html
zhlédnutí: 1 938
Video
user's guide www.ecsp.ch: breakers and switches.
zhlédnutí 131Před 7 měsíci
To use the background simulator yourself go to www.ecsp.ch. An online electric circuit simulator (ecsp) user's guide single and 3-phase breakers and switches. Watch more videos: czcams.com/channels/ZEYX01Nvi3qHsby1Cnls1g.html
user's guide www.ecsp.ch: transient recorder TR and data export to csv.
zhlédnutí 124Před 7 měsíci
To use the background simulator yourself go to www.ecsp.ch. An online electric circuit simulator (ecsp) user's guide for the transient recorder TR including export of recorded data to a csv file . Watch more videos: czcams.com/channels/ZEYX01Nvi3qHsby1Cnls1g.html
user's guide www.ecsp.ch: 3-phase source with transient reactance.
zhlédnutí 175Před 7 měsíci
To use the background simulator yourself go to www.ecsp.ch. An online electric circuit simulator (ecsp) user's guide for 3-phase voltage source and generator with transient, sub-transient and stationary reactance. Watch more videos: czcams.com/channels/ZEYX01Nvi3qHsby1Cnls1g.html
Power system HVDC classic v2
zhlédnutí 1,1KPřed 9 měsíci
To use the background simulator yourself go to www.ecsp.ch. A tutorial about HVDC and the thyristor converter technology including demo simulations. Watch more videos: czcams.com/channels/ZEYX01Nvi3qHsby1Cnls1g.html
Power system passive harmonics filters
zhlédnutí 1,4KPřed 9 měsíci
To use one of the best browser based simulator goto www.ecsp.ch. This tutorial is about filter design for harmonics in power systems.
browser based interactive circuit simulator for transient time based and frequency calculation.
zhlédnutí 358Před 10 měsíci
www.ecsp.ch/. Best interactive browser based circuit simulator for students, teachers, engineers and all who want to know a bit more about electricity.
Javascript physics: momentum law
zhlédnutí 500Před 11 měsíci
An illustration of the momentum law programmed in Javascript.
Best online circuit simulator on www.ecsp.ch. The Power Flow analysis function.
zhlédnutí 349Před rokem
Access the online circuit simulation software with www.ecsp.ch. Description of the Power Flow analysis function.
Best online circuit simulator www.ecsp.ch: The transient recorder function.
zhlédnutí 174Před rokem
Access the online circuit simulation software with www.ecsp.ch. Description of the transient recorder function.
Power transmission lines and phasor angles
zhlédnutí 3KPřed rokem
Go to the simulator yourself with: www.ecsp.ch for a better understanding of HV power transmission. Visit all videos: czcams.com/channels/ZEYX01Nvi3qHsby1Cnls1g.html
Access to the best electricity trainer.
zhlédnutí 269Před rokem
Actually the best online electric simulation platform, easy to use: www.ecsp.ch. It is best in power system training for students, useful for lecturers and a great learning experience for all interested in electricity.
Interactive power flow and load flow analysis
zhlédnutí 2,4KPřed rokem
Go to the simulator yourself with: www.ecsp.ch for understanding power flow and real power flow analysis in an electric power grid.
Electric Circuit Simulation Program: user's guide 1, how to access ecsp
zhlédnutí 269Před rokem
Electric Circuit Simulation Program www.ecsp.ch is the best online simulation program for electric circuits and power systems. It is highly interactive, browser based and fast.
Synchronous generator transient and sub-transient short circuit current
zhlédnutí 8KPřed rokem
Go the the simulator yourself: www.ecsp.ch. The synchronous generator short circuit characteristics
user's guide transient and sub-transient synchronous generator model
zhlédnutí 352Před rokem
user's guide transient and sub-transient synchronous generator model
Traveling waves and reflections on transmission lines
zhlédnutí 6KPřed 2 lety
Traveling waves and reflections on transmission lines
Power system underground cable transmission
zhlédnutí 10KPřed 3 lety
Power system underground cable transmission
Power System Static Var Compensator SVC for Power Quality
zhlédnutí 8KPřed 3 lety
Power System Static Var Compensator SVC for Power Quality
Online circuit simulator: ecsp user's guide 2 build a circuit
zhlédnutí 585Před 3 lety
Online circuit simulator: ecsp user's guide 2 build a circuit
Power System voltage stability: The Nose Curve
zhlédnutí 15KPřed 3 lety
Power System voltage stability: The Nose Curve
Simulation of voltage controllable switch on ecsp: user's guide
zhlédnutí 254Před 3 lety
Simulation of voltage controllable switch on ecsp: user's guide
Simulation of FET transistors on ecsp: user's guide
zhlédnutí 458Před 3 lety
Simulation of FET transistors on ecsp: user's guide
Simulation of bipolar transistors on ecsp: user's guide
zhlédnutí 126Před 3 lety
Simulation of bipolar transistors on ecsp: user's guide
As I understand you’ve showed that the exitation current increases under short circuit. But what about the voltage drop during short circuit??? Or both apper together exitation current increases and output voltage drops??? So, why do we need a exitation system which increases the exitation voltage for example during big induction motor start?
I am not sure if I understand your question right. This video is about synchronous machines only and yes, there is a voltage drop during a short circuit.
@@georgschett801 You showed that exitation current increases. So why do we need AVR??? And do we face the same problem wen we have permanent magnets?
@@high4702 The current in the excitation coil is jumping at the instant of a short for keeping the magnetic field within the excitation coil constant as per induction law. This jump however decreases again with the transient time constant and so the excitation current returns to the level before the short. The excess current caused by the short bypasses the excitation source through a diode parallel to the excitation source as per my video. The AVR has nothing to do with the short circuit, it is regulating the steady state voltage of the Generator. In case of a hypothetical permanent magnet there would be no transient short circuit but only a subtransient, in case of the availability of a damping cage.
Please , I think there is a mistake in the last two minutes, or may be the mistake in my understanding.
OK, thanks! But I am not aware of a mistake, can you please let me know?
@georgschett801 First, thank you very much for your interest. at the minute of 14:12, you said ( I open the breaker, and you can see now is how much this angle between the sending end and receiving end has been decreased) , you said before when adding the capacitor, the angle will decrease, so when we remove the capacitor, the angle is supposed to increase, or what? Or you may be mean when you open the breaker of the second line and not the breaker of the capacitor , is this right ?
@@user-lr6hx8bb2m I guess I see your point. When the breaker is closed, the capacitor is short circuited, i.e. not in. Only when the breaker is open, the capacitor is in. I hope this clarifies
@georgschett801 You really added valuable information to me. Thank you very much 😊
Thanks for the explanation! Couldn't find much videos which explained how the grid is controlled with various load changes
I have no clue about power lines, but I do have a clue about network cables. I know how to measure a coax cable using a signal source and an oscilloscope. After all I do have a degree…! And ten years of experience from networks!
And line up at שלומית מלכה. I will go to Tel Aviv soonest possible to see her. Then we will know! Love you שלומית❤❤❤
I couldn’t wrap my head around this concept in my lectures, thank you very much for clearing it up !
Georg! Thanks! you created fantastic traveling,
Ich schätze deine Videos sehr. Sogar ich, eine Maschinenbauingenieur verstehen zumindest ein bisschen von Elektrotechnik jetzt! Schappo!
1:03
Hello! Can you suggest free programs/ sites where you can model according to your conditions for course work?
👍👍👍👍👍👍👍👍
Hello Georg, thanks for very good video. I wonder, for stiff grid Ug =Un and at Delta = 90 (maximum power output), it seems to me that the load current has do be capacitive to make the phasor diagram complete? Thinking this scenario: Ug= Un+ jIaXs. Ia= armature current/load current and Xs synchronous reactance, referencing Un at zero degrees and Ug leading Un by 90 degrees, Ia must then lead Un by approximately 45 degrees so voltage drop jIaXs completes the phasor diagram. But then again, this seems strange as per phase output power from generator can also be written as Pout= IaUn x Cos(phi), where maximum power transfer is when cos(phi) is 1, that is when Ia is in phase with Un. What I guess i'm wondering is, how can this be true: (Referencing the video) (UgUn/2Xd)*sin(d) = IaUn*Cos(phi)? At maximum power output, Delta = 90, but can Phi be equal to 0 then? Cheers Magnus
Hello Magnus, I am not sure if I get your question right. There might be a confusion between impedance (load) angle and the angle between sending and receiving voltage source. You can use my free version of the simulator www.ecsp.,ch in order to play with the 2 sources and change the angle between two sources. So you can observe the impact of the angles and of the source voltages on the power exchange between the 2 sources. All the best, George
Thanks, I thought that the angle between Ug and Un was the load angle, is this not the case?@@georgschett801
I have assumed this: Load angle is equal to torque angle of synchronous generator pluss angle due to line impedance
No Magnus, it is the angle between the two sources. @@MagneManet
The total source angle between the 2 sources is equal to the torque angle of G1 + the angle between one side of the line and the other side of the line plus the torque angle of G2. @@MagneManet
Hello George i have a question related to type of transformer used in power systems. There seems to me that there is a disagreement online about the zero sequence impedance of a 3 core Yyn connected transformer. Some claim this has a very high zero sequence impedance while other that this zero sequence impedance is low. The reason its low is that the zero sequence flux has a high reluctance path ( has to go in the transformer tank), thereby the inductance goes down and the zero sequence current goes up. The 3 core Yyn transformer should then be able to deliver high short circuit current in the case of LG fault. The argument for high zero sequence impedance is that allot of the zero sequence flux becomes leakage flux, and thereby zero sequence impedance should be high. Do you have any idea about these things? Cheers Magnus
Hello Magnus, I am not a specialist in symmetrical components for transformers but I recommend to contact P. Ramachandran who is the best transformer expert I know. His mail address is: prc3011@gmail.com. You can contact him via linkedin as well, search P Ramachandran. Best regards George.
Many thanks @@georgschett801
Thank you Georg!
Not seeing the point so what are sub transient, transient and synchronous reactances? It’s never actually defined. Not a well organized explanation.
I have a question: why the high penetration of RES of the last decade has reduced the primary frequency reserve? Is this correlated with the inertia of the system? Thank you in advance.
There is a good paper available on internet: www.nrel.gov/docs/fy11osti/51978.pdf. As far as I am aware of, the answer to your question is YES. The primary frequency reserve is very much depending on the available system inertia, which decreases with increasing variable (intermittent) generation. How much is still subject to research as well as possible remedy.
Thank you very much for you answer I will read the paper you suggested to me!
So am I right in understanding that this is a pulsed DC system? HC-JAIPUR (23/09/2023) .
This is a classic thyristor based HVDC system based on 12 pulse rectifiers.
@@georgschett801 OK Thanks!
Your very first explanation about AC transmission reveals that you do not understand transmission lines and characteristic impedance. Thank you for making this your first point as it saved me 8.5 minutes of potentially wasted time.
I admit that the AC introduction is oversimplified and much too negative, today I would certainly choose another approach to make the case. However the transmission losses above 1000 km are significant. The main issue however as you know is stability, which can be overcome but at increasing costs per line length. Maybe I will rework the video.
@@georgschett801 No, you didn't oversimplify. Transmission lines are simply not lowpass filters. They have no inherent bandwidth limit. If they did my work with coax cables at 60GHz would never have been possible. Your error is a common one however and stems from imagining them to be comprised of lumped elements. This analysis can be made to work, but only by allowing the number of elements to tend to infinity. So please, don't use this analogy - better to say nothing than feed erroneous ideas into the minds of those that may one day need the correct models.
Everything you say is correct. You are obviously a HF expert! Pardon me however if I still use the simplification. In power system analysis we often use a simple lumped LCR models for power flow analysis. The lumped models give quite good results for shorter transmission lines. If however we need models for longer lines, higher frequencies (switching impulse, lightning), Ferranti effects or compensation of reactive power more accurate models are used. I myself use a type of Bergeron distributed model which is common in programs such as EMTP or ATP. I guess you use similar models based on surge impedance characteristics. So again, I exaggerated the losses with my introduction and there I fully agree with you.
Very interesting simulator
Great tool for electrical engineers. Thank you for sharing.
Very good. The total energy can diminish but the total momentum has to remain the same. Although the energy would have be lost to the walls, I suppose.
Good point. No the simulation does not take care of the energy lost through the walls and therefore it stays constant.
What do you mean? It is all in the video.
I mean, the simulation file, because when I tried to make it there were components that weren't there and it didn't match what you made, sir.
and I'm just learning, in the video it's too fast to take the components, the wave results I make are not like the ones you make in the simulation
and I'm not fluent in English, I just use translation to understand it, because of that sometimes I still don't understand what you mean, sir.
The transmission line models are available in the pro-version of the software. The free version does not support these models.@@rasras6002
can you share this simulations sir?
What is the simulation software used
www.ecsp.ch
Hello, thanks for great explanation. Just wonder a bit on the sign convention used? Is this active sign convention, and if so, why is that preferred in load flow?. Normally i am used to active power delivered to system being negative, while active power consumed being positive. Whilst for reactive power '' delivered'' (capacitor) will have a negative sign and reactive power ''consumed'' inductor will have positive sign. like this, generator overexcited S= -P + -jQ. Underexcited S= -P+jQ. For loads (including resistive element): capacitive S=P+ -jQ. Inductive S=P+jQ. Maybe i got something wrong?
No, I think you got it right and this is the convention I use as well. The power of a source delivering power to the system is negative where as the power consumed is positive. I share your views for the reactive power as well, so where is the misunderstanding, did I make a mistake somewhere?
Ok, from the video at 44:22, when the iteration stops. the load busses (nr 3 and 4) has negative active power and nr 4 which also is capacitive has positive reactive power i.e -1.62e+8 + j1.00e+8. The Generator busses has positive active power, slack bus also has negative reactive power even though the system is capacitive meaning generator should be underexcited and then according to passive sign convention should consume reactive power +Q. @@georgschett801
You are right (well done, you are the first one seeing this!). I was not consistent and switched between the consumer arrow system (which I normally use as you do) to the producer arrow system (unintentionally). In the producer arrow system positive is active power generation, negative is active power consumption. But the principle regarding the Gauss-Seidel iteration is the same. Thanks for your note!
Aha, then I follow, anyways, thanks for making these great videos, they are really helpful :) , @@georgschett801
Perfect explanation of HVDC basics and power flow concept, very nice simulation as well, thank you very much.
Hi George. Please tell me why in the theoretical part the battery is charged when the controller phase is leading, but in the example with simulation, it is the other way around?
It should be so: When the battery is charging, the power is flowing from the grid to the battery, thus the phase angle at the converter should be lagging behind the grid voltage as it is shown in the simulation.
The name of the program that the simulation worked on
www.ecsp.ch as per link in the comment line of the CZcams videos.
Thanks for the information
Sir which software ur using is it available for download is it free?
www.ecsp.ch, it is browser based no download needed.
Great software! I want to use it for DER Kwh injection in the power grid! Is there a module that can help?
Der is no specific module for Kwh (energy) injection but you can vary the power (phase angle or torque) of one or many sources in a network arrangement and check the corresponding impact on the power flow (voltages, currents) and so on. In the free version you can check how it works. In the pay version you have line models and 3-phase model, plus you can see the phasor analysis.
Really nice and clear representation, thank you for your videos. My question is how do you visualize the deplacement of rotating magnetic field in reference to the the stator rotating field and the change in angle in your slides?. It really is a good animation and helps to get the concept.
Thanks for your kind feedback. I do this with power point visual basic or for even more complex graphics I use javascript.
@@georgschett801 Really good. thank you. Do you have presentation showing 2 generators or more working in parallels visualizing the way their angle interact to changes in the system? for example if system load is increased / decreased, etc.
@@trinottuk Maybe this one is what you are looking for: czcams.com/video/RxzMHQ4o1jI/video.html and by the way, this is exactly what you can do with the proposed simulator on www.ecsp.ch
@@georgschett801 Thank you very much. Are these presentations available for registered members?
@@trinottuk No, it is for everybody. It's all on my channel: czcams.com/channels/ZEYX01Nvi3qHsby1Cnls1g.html The pro-version of the simulation tool is for registered members only: www.ecsp.ch
What about wood pole power lines? Wood is relatively good insulator.
I am not sure if this changes much because lightning can strike a tower but between towers as well. And the shielding wire must be grounded at the pols and thus even wooden poles would be conducting.
@@georgschett801 The shielding wire is not installed on 20 kV power lines. In my country there are still some 10 kV and 20 kV power lines with wood poles
Quite amazing visual! Great job Georg. 👍
Very informative. Thank you very much.
Dear George. Do you have an account on linkedIn? What's the account name? Can I connect with you?
www.linkedin.com/in/georg-schett-online-circuit-simulator/
What is meant by the torque on the generator? Do you mean the torque moving it at 50hz or another??? Thanks
It is the mechanical torque on the generator provided by a turbine for example.
@@georgschett801 🙏 thank you!
extremely useful. glad i found this channel
useful!
Magical man
I’m showing this to my trainee tomorrow!
Please, it no work
OK, in which country are you trying to access ecsp? I guess it is the free version?
Hi!, thanks you for answering. I am from Peru and I would like the free version to evaluate the PRO version
@@georgschett801 Hello, thanks you for answering. I am from Peru and I would like the free version to evaluate the PRO version
@@paolochang7510 I do not know why it should not work in Peru. With normal PC and with a mouse (no touch screen) it is normally OK. Which browser are you on? How far do you get? Let me know on schett.ecsp@hispeed.ch.
Thank you for posting the video, it is really informative and interesting!
This is pure gold !! Thanks for such a lucid explanation.
very usful webinar, I suspect I will be spending a fair amount of time playing around with the online app.
Thank you for a great lecture.
I’ve never seen such a great explanation of SG transients. thanks a lot
Hello thanks for good explanation. Just thinking, adding inductors in parallel should decrease inductance. If you have over voltage because of too much capacitance, then shouldn't the inductor be added in series? Cheers?
You have to add inductors in parallel. Just as a very simple model: Many inductors in parallel would bring you closer to a short circuit where the voltage would be zero. Many inductors in series however would bring you closer to an open circuit which would have no effect on the over-voltage anymore.
@@georgschett801 that's a good way of thinking about it!
00:58 R.I.P. Headphone Users
Great video 😊
I really liked your video, straightforward explanation and nice analogy with the horse-spring-weight example.