HVAC vs HVDC | What is the difference | TheElectricalGuy

Differences between HVAC & HVDC transmission system are explained in this video. The video explains 7 different parameters for the comparison of HVAC & HVDC transmission system.
Introduction to HVDC - • Introduction to HVDC T...
⏰ Time Stamp
0:00 Intro
1:08 System with different frequencies
2:45 Tranmission limitation
4:46 Conductor diameter
6:29 System Structure
7:49 Cost
9:15 Power flow direction
10:19 Losses
11:11 Tower design
12:11 Summary
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#hvdc #powersystem #powertransmission

[@Vishnu10205]

Gourav sir >>>>>teachers in class 🙏🏻Ur efforts matters a lot

[@GauravJ]

Thank you !!

[@jeffcibulka5063]

Thank you for the great explanation.

[@JohnJohn-dc7id]

Good explanation. Thanks very much 😊

[@shubhamsharma-yy1lo]

It was quite helpful to understand the difference between these two giants of transmission. Thank you keep uploading videos like that.

[@mhonella]

Well done sir, very interesting and informative. As i watched I had several questions that you fully explained.

[@user-ud3iw8bv9w]

You keep going man, you're doing great😊

[@handyman7147]

Nice explanation. Thank you. Even when two grids follow the same frequency standard the frequency stability of both is also very crucial. For bidirectional transmission in HVDC both converter stations will require Ac to DC and DC to AC converter. This is not a small cost but cost is always justified in any project.

[@Navi_Habakkuk]

Great stuff. Kudos 👍

[@chintumali3227]

hello sir , i watch ypur all video, Literally it is very very useful for clearing basic doubts and very good for basic knowledge . very very thank you.

[@danielimanah8681]

Thanks 👍 well understood.

[@MarkPrince1317]

Impressive knowledge such a beautiful and easy to understand all your fantastic educational valuable videos Thanks and best regards ☕☕

[@ikramkhan1429]

Good job thanks

[@venkatvenky1832]

Helpful Sir,please make a video about VFD,Soft starters..

[@fredsalter1915]

What does the ink say on your right wrist? Just curious. Great discourse on this complex topic, sir!!!

[@ernestb.2377]

Hm. A general talk with a "higher-lower" terminology doesn't help. I would like to understand, so some typical numbers would help. What are we talking about. And how would it be possible that for the DC transport there is no loss!? Every conductor has resistance. P=I^2 R. For AC transport, the frequency is quite low, so I don't expect the reactance due to inductance and capacitance to be high. Actually, both systems need to deal with the same resistance part. But both systems are high voltage to keep the current lower, as I said P=I^2 R, so we want to keep the current as low as possible. Every cable is heavy, so for AC, they build a cable in such a way that inside you have less conducted carrier, and outside the good condctive material for the skin effect. Maybe the HVDC has potential, but I would like to see the numbers, regardless of more complicated conversion for DC, just the transport per unit length. Cheers

[@beebijency953]

Great class Sir. Kindly do a video on solar power generation, net metering and gross meterin

[@donberg01]

What source can I look up size of cable v frequency? i.e. the difference between DC/AC size cable for the same voltage?

[@saretpreap4978]

Could you explain about transposition tower in transmission line?

[@ganeshrr2gt9]

Explanation is amazing sir 👌🏻🔥. But I have doubt! In distribution side i heard about a terminology called "back feed or back feeding" and i do experience it. But u just mentioned in this video that hvac is unidirectional. Could u please explain me sir?

[@mohibquadri4053]

Bro what do you believe are some top traits and tips to become a high earning hvac engineer in Aec construction industry working for air conditioning projects.. which books would help in this scenario..

[@vimalbs9729]

sir, give video detailed video about distance relay

[@Nikhil_jadav12]

Excellent explanation Sir, But next video make on how to work Convertor station, what is valve hall in HVDC system and today which country is more installation HVDC transmission line.

[@YogeshKumar-vn8po]

SIR, can you provide the how much the initial installation price differs from HVAC TO HVDC.

[@mohars2314]

Please make video on battery charger.

[@SoumyaSenapati-y9w]

Can we connect SVC to 220 KV system?

[@tomp9447]

I thought that the break-even point was based on the infrastructure costs; but it seems like just the efficiency could make it worthwhile with that amount of power, IDK? Thanks, good video!

[@GauravJ]

Infrastructure would count as well. Overall view is seen

[@michelgrenier1878]

Interesting video , But my question is if the original power supply was by a DC generator would it produce power using less horse power than an AC alternator system ?

[@SauravKumar-gu5qx]

HI , I am still confused how HVDC prevent the heating effect of the Direct Current.

[@ullasgovardhan]

Sir this one is very informative thank you. Sir can you please do a video on the HVDC transmission line protection schemes as in the case of HVAC we are having inductance parameters for the use in relay 21 (backup protection), where as in HVDC only resistence is present. And one more thing sir, why is HVAC transmission bidirectional power flow not possible, like the lines we use to send power can also be used to receive power back as if the power sending (export) is less than power recieving (import) we will be recieving power to the grid and vise versa , correct me if I'm wrong.

[@GauravJ]

Thank you . I’ll try 👍🏻

[@vishwanathank.s8214]

Neutral or my mains in my meter box keeps burning at main connection on bus bar every 8 to 10 month of my house

[@bestlife3062]

It's hard to judge but I think the distance will be the best to judge from.

[@GauravJ]

Certainly

[@zatchbell5093]

👍

[@jivansahni1466]

Cross-bonding and SLV (Sheath Voltage Limiter) earthing Details me video banayo thora

[@kiddomonkou9747]

I wonder why the losses in HVDC remains the same with increasing distance, can anyone enlighten me please? I'm thinking about the formula R=pL/A where the resistance is proportional to the distance. Or am I using the wrong equation here. Thanks.

[@RajivLochanPanda]

I think he's talking about the "rate" of loss that is constant in HVDC. Which is right in line with what you mentioned, that is, the resistance is proportional to length. So, for each unit length of wire, the loss will be constant.

[@kiddomonkou9747]

@@RajivLochanPanda oh yeah, I see. Thanks. He means the resistance in DC vs the impedance in AC.

[@danielimanah8681]

Resistance remains the same over a particular length irrespective of load it carries until it surpasses lengh limit. You can put it into power simulator and you get it very clear. As field power engineer we see this commonly.

[@jayak3768]

Doesn't ac allow to do step up and down while DC doesn't.

[@Tavi57]

Regarding power flow direction, both HVAC and HVDC is bi-directional.

[@danielimanah8681]

Don't think so 🤔 hvac cannot be reversed to point of generation but DC can due to converters

[@imeprezime1285]

​@@danielimanah8681Theoretically it is possible because synchronous electrical machine can operate both as a generator or as a motor.

[@newstabb1616]

Sir, I remember the controversy between Tesla and Edison. Edison wanted to have DC transmission system but the drawback was DC was not able to transmit to longer distances. Then Tesla introduced the concept of transformers and long range transmission. How come then HVAC is having limitation in transmission and HVDC is not having any issue. I am confused.

[@danielimanah8681]

Clearly due to inductance, freq and capacitance which are absent in hvdc

[@tanmay4703]

Skin effect bro just don't read the Edison and Telsa story half

[@NazimUdDin-tg8jg]

Isn't HVAC is also Bi-directional. When a powerplant needs backfeed it uses the same transmission line to start the power plant.

[@Dummydoda]

Same question, as solar panels also backfeed Into the grid through the same lines. Which made me second guess the statement that AC would be unidirectional.

[@danielimanah8681]

​@@Dummydodanot possible. Solar system does that true comvertes.

[@danielimanah8681]

Not possible. Distribution cannot be reverse back to generation point. Power plant uses another source or running plant not its own source

[@danielimanah8681]

Black starters are for types of generators that can't start without assistance. Before this is done the Tgrid is isolated to avoid collapse. Same with hydro turbine they need battery's to open the gates for the gen to prime and start. Black starter are not for distribution network only for plant starting and that depends on the type of generator model.

[@tanmay4703]

Yeap not possible... But it can be transmitted to where it need like aluminium factory. In peak solar plant generation that's is how they manage the peak demand and generation of power.

[@siddusudha6608]

What happen when ac power line exceed 2k KM sir

[@imeprezime1285]

Ferranti effect

[@DavidSmith-vm3cu]

AC is bidirectional, as several commenters noted. Inductance and capacitance are not energy losses, but part of the physics of AC. They do place limits on dostance. So whatt is Break even distance in mi or km? Probably function of power level too. Rule of thumb for AC is 1 mi per KV, eg 345 mi for 345 kv. Note that DC transmission required invention of solid state devices in large sizes and high voltage levels, only in last 20 years or so. Done at turn of 20th century by motor-generators, not very good solution. AC power systems built over last 130 years before HVDC invented.

[@imeprezime1285]

This is inaccuracy in the video. Bi-directional power flow isn't possible between AC systems operating at different nominal frequencies or between non-synchronized AC systems. Other than that it's quite possible and occurs on daily basis. However, use of (HV)DC is beneficial again regarding flexibility and stability control of the systems

[@Musaabid148]

Sir koi Group hai WhatsApp Ap ka?

[@GauravJ]

No. But we do have a community on courses.theelectricalguy.in

[@wahdateummat9277]

Sir plz convert this video in hindi

[@Hemanth83439]

Bro I have a doubt,Losses in DC is less then why not it used as transmission ,the high cost is the only reason for this

[@danielimanah8681]

True. but it's become common on solar plants

[@user-wf2yq8jc6g]

its not used as we dont have any generator which can generate dc current and also we cannot use transformer on dc so its very difficult to convert high voltage ac to dc vice versa its cost is very high and also not stable it getting damaged easily we can only use it when we get something simple to convert high voltage ac to dc and vice versa

[@FlorinSutu]

4:46 - At 50 Hz or 60 Hz, the skin effect is negligible.

[@user-kv7db8pn3u]

Dc current voltage drop when it is go transmission lines the process not possible in America then many people used ac current, your explanation was wrong dc current must requires thick conductor when AMPS increased,I have a doubt about your class how can you transmit dc current using transfer, transfer only used for ac supply,if your connect dc supply to the transfermer how it achieve contraction and expension of core with flux and induced EMF it not possible in dc current because of it nope any cycle frequency then how it creates repulsion and extraction in the winding Please answer questions I need your response it is helpful to me

[@user-kv7db8pn3u]

Transformers only used for ac current to voltage and AMPS increase or decrease

[@danielimanah8681]

You are abs wrong. If you have worked on small and large solar plant you should know. Very High DC voltage over high DC amp requires small wire Guage. And power flow is very efficient. It's hvdc not jus DC transmission note that.

[@user-kv7db8pn3u]

@@danielimanah8681 small guage wires not used for dc current,then how can you get AMPS , amperes depends on wire thickness because of dc current electrons flow throughout the conductor so it must need wire thickness to flow electrons with many ampers through conductor and if you use thin conductor it resistance is not matching to resist the many ampere flow thin conductor generates heat due to many AMPS but thin wire so must use minimum 10 or 15 square conductor what did you said that is wrong,I said correctly because of I was finished many experiments on the topic

[@danielimanah8681]

​@@user-kv7db8pn3uHave you worked on low voltage DC power system before and compare to high voltage DC systems? Simple ohms law holds on DC transmission irrespective of the amp. For example, Once voltage is higher than amp with 10:1 ratio, you can use very thin Guage with negligible loss. Very effective and efficient

[@user-dc2ot2tj2b]

HV AC or HVDC it does not matter it is utilitie talk you do not have to deal with it it is only for transportation from electricity it is the same like talking about walking on mars we know that 99,99 % of all people willl never walk there.

[@paulmccredie3106]

A very informative video. However I have to dissagree with you about AC systems not being able to be bi directional. AC based grids regularly transmit power in different directions as demand and supply varies throughout the regions within which they operate. Indeed energy storage systems also make use of this ability. Whilst power producers - whether mechanical or inverter based - have to be syncronised accreos the grid, the direction of energy flow is controlled by varyation of the relative voltages between suppliers and consumers.

[@danielimanah8681]

Can you reverse distrubuted power back to generation point? No.

[@danielimanah8681]

Can you reverse distrubuted power back to generation point. No

[@paulmccredie3106]

@@danielimanah8681 What do you mean by the phrase 'reverse distributed power back to the generation point'?

[@danielimanah8681]

@@paulmccredie3106 the general ac grid system is from generation tru MVA to distribution tru substations with smaller kva transformer. Obviously that can't be reverse. It's a 1way power direction. But due to electronic converters/inverters from ac - dc and verse versa in hvdc is dual.

[@paulmccredie3106]

@@danielimanah8681 I have to disagree with you. The first thing to understand is that transformers CAN be reversed. Let's take a transformer with a turns ratio of 2.3:10. If you feed 11000 Volts into the HV winding, you will get 230 Volts out of the LV winding. You can do the reverse and feed 230V into the LV winding and get 11000V out of the HV winding. Now let's deal with a couple of real life scenarios: We have a power station supplying power to the grid and also to its own auxiliary equipment, site lighting, maintenance workshops and administrative offices. Energy is flowing from the site to the grid through a transformer which raises the voltage to grid levels. Now let's shut down the generators for maintenance. The generators are now not producing any energy but the lights are still on, the workshops still have power and the admin staff can still use their computers. This is because energy is now being supplied from the grid to the site using the same wires and transformer which are now operating in reverse. The second scenario is on a smaller scale. We have a house which has solar panels. It's a dull day so some of the energy is being supplied from the grid which means energy is flowing IN to the property. The sun then starts to shine and household loads are reduced so energy now flows OUT of the property. If most or all of the houses being fed be the local substation produce more power than they are consuming, then energy will flow in the reverse direction through the substation transformer onto the local HV network. Power can be supplied in either direction whether the system is AC or DC

[@pmarwaha]

Please correct spelling of Conductor (your presentation has misspelled it as Conductor)

[@SoumyaSenapati-y9w]

Can we connect SVC to 220 KV system?