History of 3-phase Electricity & Distribution

Just because Dolivo-Dobrovolsky didn't speak English, He didn't get fame as much as he deserved. This is unfair.

and edison and westinghouse made sure history books never mentioned tesla. but we got mgm making young tom edison movies, all thanks to hearst and ford, with edisons original film patents.

I do like her presentations...this one included. But the incessant hand waving is truly distracting.

Alessandro Volta 18 February 1745 😊

Alessandro Volta

I like your video a lot I think for learning the science in high school the background associated with discovery that is history helps a lot .In another world the history reduces the bitterness of science specially for those students whose brain like stories

I'm glad to discover your channel! I wanted to understand 3-phase to discuss with my son who does theater lighting. This video helps make sense of electrical distribution and evolution. I liked, subscribed and plan to view more episodes. I love your enthusiasm! Thank you for the research and well organized presentation.

This woman should spend more time cleaning and cooking and leave electricity and physics to experts. On the other hand, how would americans exist without rewriting history.

The hand movements are electrifying....

We know for sure that it was not Edison.

Perfect! This should (but won't) silence all the Tesla fanboys. Tesla invented nothing, and nothing was invented in America.

"Lower the cost" should have something to do with reducing the loss of energy, or increase efficiency at each oscillation....or during transmission.

"in perpetuity" so, where is that extra amount being deposited?! lol

Ouch, Tesla is overrated 😮

Isn't it marvelous that AC power transmission effectively has no moving parts -- not even the electrons. At 60Hz they barely move in the conductor when transferring power.

I like your bookshelf. Good history titles!

3 phase seems like there should be a 3rd scientist. Probably someone even earlier than 1987 ???

Great keep coming

Very good. Thanks.

I love your videos, but please consider a new microphone and stop waving your arms all over in front of the camera.

Thank you. Very interesting.

I'm still chuckling about Nikola Tesla blowing up the Colorado Springs power plant.

Westinghouse was the real promoter of AC as he invested all his fortune honestly into development of AC sources and machines....

So many presentations are spoiled by noisy music, this one by hand waving instead.

Tesla did it all, He was the ginchiest moon doggy

Very interesting video. Thank you for explaining the concept so simply.

Great video and great presentation. What will I notice if I have to identical devices but one worked at 50 Hertz and the other on 60?

Additional books to read, "Light for the World, Edison and the Electric Light Industry", "Men and Volts. The Story of General Electric".

no mention of rankine kennedy? he was a rather important character who is even more neglected by the history books than tesla was.

Wonderful, superb work! Just wonderful! Thank you! This work shows, illuminates the struggles involved with the evolutionary discovery of God's 'laws,' whether it be 'electricity,' or otherwise. Wonderful work! Micro and macro unity.

FYI, Pittsburgh PENNSYLVANIA still has alot of 2 phase in use

kathy please state the title etc of your book and keep up your obvious enthusiasm

agree with most comments posted Kathy keep up the great work you are a great teacher

Like most American electrical engineers I learned that Tesla invented 3-phase motors and generators and never heard of Mikhail Dolivo-Dobrovolsky. Nice to hear the real story. It is interesting that it never occurred to the great Tesla that he could eliminate three of the six wires since the phase currents vectorially added to zero. Of course Tesla probably never had the advantage of mathematical tools like phasors. Also interesting that the great AC-DC wars fought between Westinghouse and Edison were fought with the wrong polyphase system (2 phase) and the wrong frequency (133 Hz). The better AC system eventually won out of course.

I was lucky enough to make deliveries at the huge Westinghouse Electric Plantnin East Put ,Pa . In 1982 they still were the go to for the worlds largest best generators,transformers . I delivered to all the Depts ,the most impressive was the High Energy Lab. They would do blasts of currents that would make the hair stand up on your neck. Red lights and alarms would sound when testing . They had some of the biggest lathes and machinery in the world.With deep pierings needed to support them .I also like the LRA large rotating apparatus plant .Those guys wound the transformer so large they stood inside them on platforms .Place should have become museum of Industry .

I am sure you are aware Tesla invented a lot of stuff and then moved on because his main interest was power not electricity. Their was a lot of problems with the ac motor that stienmetz fixed. Heavyside had a great deal to do with all this and does not get full credit. Eric Dollard is one of the most knowledgeable people on electricity. Great presentations.

the seems a hole store of eclectic meters and metering of supplies, that needs to be covered too? is tuth on, but only just, maybe the politics of it if there smoke filled rooms involved too?

I like purple !

Dobrovolsky invented THREE-PHASE electricity. Tesla invented POLY-PHASE (up to 21 "phases" on the Niagara Falls power generating plant). Tesla tried to convince Westinghouse to abandon "110 volt" (Edison's DC power was actually 95-100 volts) and go to poly-phase 277 volts and 400 Hz as it would make transmission FAR more efficient and transformers (and electric motors) much smaller and lighter, but there were too many "Edison Plants" providing DC for street lighting in large cities in the US plus the soon-to-be extinct electric cars and VERY slow heavy trucks all used "110 volts" for charging. NYC subways operated on 600 volt 25 Hertz AC until after WWII. My 1958 Chrysler Imperial had a 7 phase 12 volt Motorola Alternator, but MOPAR phased them out by 1962 for three-phase (excepting the turbine cars). The '58-'61 Imperials had the brightest WHITEST sealed beam headlights on the road, as the bulbs received a FULL 13.8 volts. The spark plugs and points lasted forever too.

The reason the U.S. uses 60 Hz is actually pretty arbitrary. Nikola Tesla had a childhood friend back in Croatia, simply named Gary (with no surname). This friend's lucky frequency was 60 cycles per second. Tesla later decided to use his friend's lucky frequency in his power systems.

Not being an EE I can't explain why the Salt River Project (SRP) in Arizona used/uses 25 HZ for hydroelectric distribution.

The Hz story is more complicated than "Tesla wanted 60Hz". Every electric grid in the US was slightly different, which for lighting mostly didn't matter, but it mattered a lot for clocks. Every clock had to be manufactured for a specific electric grid, because if you took one that was built for a 57Hz grid and plugged it into a 63Hz grid, the time would quickly be off. Fixing the grid at 60Hz was a collaborative effort of clockmaker Henry Warren, along with Westinghouse and the US Naval Observatory, among others.

Second time listener and now subscriber.

Hard to explain it but she did. Clap Clap Clap Clap!

I'm an electrician studying service engineering that I just found your channel and wanted to say thank you for your amazing informative content!

Thank you

The more I hear about Westinghouse, the more I want to hear about Westinghouse. Seems like a wonderful bloke; and those mutton chops!!!

I love hearing about Tesla's invetions. Tesla was a genius, but it's clear he didn't develop all his idea's in total isolation. Often basing his work on others and refining it. In the end inventors like Edison got all the limelight and Tesla became a cult figure and only recently has become popular once again. It's sad that other inventors who took part don't get the credit they deserve. This is the first I've heard of MDD, but it's clear his work is very important because people still use his Star and Delta transformer setup on 3-phase electricity to this day.