Authorized Personnel Only - Mercury Switch Turbine Overspeed Governor In A Hydroelectric Powerplant

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3 жыл бұрын

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Пікірлер: 55

@matthewbeasley7765 2 жыл бұрын

I'm surprised it isn't a normally closed circuit - that way any broken wire is detected.

@blackturbine 8 ай бұрын

That's actually smart In case of electrical fault it would shut down the generator I'm guessing there is some kind of additional safety device like something that measures the frequency and if it gets too high to slow the generator down as well

@badatpseudoscience 7 ай бұрын

I was about to post the same comment. It's an engineering principle to fail to a safe state.

@kylehenline3245 28 күн бұрын

@@badatpseudoscience Short of a catastophic failure in the generator or gearbox, if this one even needs a gearbox, these machines can't really overspeed when it is actually tied to the grid. There are a bunch of other safeties that either of the two former scenarios would set off, and most likely more modernized reluctor type system also monitoring the RPM. But no reason to delete a perfectly functional additional level of protection. That turbine spends 99.5%+ of its life tied to the grid, and in the point when its not there are human eyeballs monitoring it. A broken wire being able to take a plant offline is a far less desirable set up. Generalized principles can NEVER be applied to all applications. For example in aviation many systems are designed to fail to an on state, because suddenly losing power due to a non critical issue is far more dangerous than the equipment having the potential to tear itself apart/let out the smoke if a failure is not properly managed.

@bobgall863 2 жыл бұрын

Very cool to get down to the real workings these older power plants.

@michaelprice7601 3 жыл бұрын

Oh man, I remember when I was little (probably about 6 or so) I got the chance to tour a hydroelectric dam and I remember having a great time, it was with a class of collage students and apparently I asked more questions than them! I just wish I could get the chance to go back and fully appreciate it! Awesome video as always Chris :)

@ocsrc 2 жыл бұрын

Reminds me of the balls to the wall mechanism on top of elevators that apply emergency brakes if it goes too fast

@SOU6900 2 жыл бұрын

Or the governor on a steam engine?

@Physicsduck 2 жыл бұрын

Check out my other Hydro Dam videos here: kzfaq.info/sun/PL-3Y2XexL9dRz9zskedt9vejSoNFmAESQ If you like what you see here, I'd appreciate your help to continue making free, educational videos for all: ko-fi.com/captainboden

@AugustusTitus 2 жыл бұрын

that's some runout

@Physicsduck 2 жыл бұрын

More of a limp really.......

@steveschlick995 3 ай бұрын

Reminds me of our dynamatics for our Komatsu presses.

@D2sWORLD 3 жыл бұрын

Very informative, subscribed! Looking forward to more videos!

@Physicsduck 3 жыл бұрын

Thanks for the sub! I'm sincerely glad you're here and enjoyed the video! :)

@ericv8319 Жыл бұрын

Damn! governors got a little run-out!

@donparker8246 3 жыл бұрын

I love it. Always interesting stuff😎👍

@ikonix360 2 жыл бұрын

What used to be in that empty space?

@kylehenline3245 28 күн бұрын

I think you mentioned before that this is done on purpose, but holy runout batman.

@NickHorvath 3 жыл бұрын

So what used to be in that section where it's just a shaft now?

@b43xoit 2 жыл бұрын

an exciter generator??

@ocsrc 2 жыл бұрын

That's a lot of movement in the shaft

@walterfarley9230 3 ай бұрын

Shaft is true . The slip rings has a slight egg shape the keep the brushes from sticking

@the-real-qbanz 20 күн бұрын

You means it’ll open the circuit not close it. A closed circuit is a complete circuit

@network_king 3 жыл бұрын

Where are the windings, etc on it? Looks like that hallow cage where the shaft comes up should be where the generator would go.

@Physicsduck 3 жыл бұрын

Below that bearing you see when I look down. The generator is ten feet in diameter, I'm standing on it.

@Gollammeister 2 жыл бұрын

Is it similar to like how a lift speed governer works?

@seamusjohnson2621 3 жыл бұрын

wow thats cool!!!! what camera are you using there? crystal clear!

@Physicsduck 3 жыл бұрын

This was shot on the blog camera. amzn.to/38pjlF5

@seamusjohnson2621 3 жыл бұрын

thanks! that's a nice camera! I have a Panasonic HC V700. its a camcorder but very nice!

@beefchicken 3 жыл бұрын

What’s up with the runout on those sliprings?

@LordOfSilense 3 жыл бұрын

Old school manufacture tolerances, somewhat worn bearings, etc. etc.

@Physicsduck 3 жыл бұрын

When you get that old you'll wobble a little too.

@beefchicken 3 жыл бұрын

@@LordOfSilense nah, old school manufacturing tolerances were just as tight as they are now. Saying that is an insult to the machinists of the past.

@gus_kilpatrick 2 жыл бұрын

I'm randomly replying many months later (it's a long story why I'm watching slip ring videos) but: some slip rings are intentionally machined with runout to induce dither in the brushes. Keeping the brushes moving back and forth is one way of preventing them from sticking in the spring-loaded brush holder, so as they wear away they maintain pressure/conductivity.

@tihspidtherekciltilc5469 2 жыл бұрын

@@gus_kilpatrick A man of intelligence. Rare these days. (see above expert with nothing to prove so)

@tilleybs 2 жыл бұрын

I thought it was a duck.

@GeofreySanders 2 жыл бұрын

A physics duck, as it were.

@theotakunet 3 жыл бұрын

If its a safety, shouldnt it open the circuit to stop it? Just wondering mayne it different then normal ones

@Physicsduck 3 жыл бұрын

It probably is, I just misspoke.

@jimnasby Жыл бұрын

@@Physicsduck the mercury switch will be normally open (closes the circuit on an overspeed). To answer Christopher's question; there are other ways to ensure that you have good contact. One of the simplest is to have a resistor across the mercury switch. When the switch is open during normal operation, you can in essence measure the resistance. If the switch closes (overspeed) the resistance goes to zero and you know you've got a problem. If the circuit opens, the measured resistance would go to infinity, and you know you have a different kind of problem.

@jamesspash5561 3 жыл бұрын

The run out on your machines is horrendous. Seriously in need of alignment. The expensive part is you ran them like this, so the thrust bearings will need to be rebuilt. and all the guide bearings, packing boxes, shaft sleeves and runner seal rings are shot.

@rustblade5021 3 жыл бұрын

i'd bet there's an issue with the foundation or ground shifting. rebuilding without addressing that would probably just make the problem worse

@tihspidtherekciltilc5469 2 жыл бұрын

Feel free to use your time and money to fix what's been working for decades armchair holder downer. Make sure to video it too.

@walterfarley9230 3 ай бұрын

Its not run out . Your looking at slip rings they are slightly egg shaped to keep the brushes from sticking

@rustynail4676 Ай бұрын

If seen alot of guns with slightly out of round slip rings just to keep the brushes moving in there housings

@davidthumbs2327 8 ай бұрын

im here to notify you .. Antimatter has come into contact with my tv AND my mistresses kitchen sink.. when do you want to start the interview? 0_o

@tobyradabaugh5033 Жыл бұрын

How dose the increased water flow not spin the turbine faster

@zyeborm 4 ай бұрын

the turbine is synced to the grid, full load or no load it will go that speed. More water just means it's pushing harder doing more work at the same speed

@robnnorthaustin 3 жыл бұрын

I love large generators. What vintage is this one? I'm guessing late 30's

@Physicsduck 3 жыл бұрын

I think you're pretty close.

@RJ1999x 3 жыл бұрын

@@Physicsduck Allis Chalmers?

@GeofreySanders 2 жыл бұрын

How about that squeak, then?

@loganosmolinski4446 Жыл бұрын

Boop

@AndrewFremantle Жыл бұрын

Your statements sound contradictory to me - You call this an "Overspeed Governor", while I think the correct term for what you describe would be an "Overspeed Shutdown" or "Overspeed Trip". In my mind, "Governor" implies it plays a role in governing something, and would instruct the turbine to *slow down a bit*, not to "shut down". Regardless, really cool stuff.