Let's Get Excited In Here
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- čas přidán 28. 08. 2024
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Field current generates AC current, converted to DC by the commutator. Then this DC current is fed back, via the large slip rings, to provide the excitation voltage for the big alternator rotor down below, so that it can then provide 3 phase power on the output. The field current controls the excitation current, allowing you to control the output voltage of the alternator down at the bottom, thus providing a way to control power delivery into the effective infinite sink of the grid.
Not sure about the second small set of slip rings, they probably provide some sort of control, or are part of a brake used to slow the alternator down when taken off line. But overall a small control current, around 5A tops, will provide a huge current flow, up to around 200A, from the size of the commutator as peak, with all this amplification being powered by the shaft rotation. Nothing electronic at all, and so reliable that it is still working as designed, after more than a century of use.
From watching his other videos, the thing on the top is a mercury switch which lets the system know if the turbine is spinning too fast. I'm guessing the little slip rings attach to that?
I THOUGHT that's what it was! I saw a video on car alternators a while back and I remembered those needed power IN to energize the magnets!
Every day is a school day! Great video but almost outdone by your disclaimers....! Hilarious!
Glad you enjoyed it! If you like my writing, you should check out my books. They're deeply inappropriate and funny as hell. amzn.to/30TCxtQ Not for the faint of heart!
If you can read this, you've voided your warranty lol!
Cool explanation of how the exciter works. We have an old Onan cummins diesel genset (1960's) that has an external exciter that is belt driven. It looks like a large alternator.
Does that mean you can't black start your plant? Or do you have a backup diesel to provide that initial field?
Some plants have a DC battery system for excitation and protection circuits.
In other words, it's like an electric pony motor that spins a bigger one.
interesting how you need some electricity to make more electricity,
No, a little generator that sends power to the coils in a bigger generator, making them electromagnets. You could just spin permanent magnets, but you couldn't control the strength of their magnetic fields. They'd just be what they were made to be.
Your answer is probably fine for the people that already know most of it and only need the missing bits, but for the rest of us, the answer is incomplete.
LOL I just read the disclaimer grate video mate.
Glad you caught that :)
✅ Yes I have read and understand the disclaimer as shown.
TLDR🤣
So how do you bootstrap it?
@2:02 So much coffee!
Oh no! Forgot to explain the mercury switch! Is it really an overspeed trip? That seems…unlikely to me…
Yup it is really an overspead trip. The mercury switch is rigged so the mercury sloshes up a tube and makes contact if it does it trips a mechanism that both cuts the water flow down and energizes a braking contactor. Those same mercury tube switches are used in big old industrial boilers. They are extremely reliable generally outliving the equipment they are installed in. 🤓
What about the switch?
He did forget about the switch but in previous videos it was stated they are safety cutoffs. It will trip if it goes too fast. It can be wired in many ways but I think in this instance they will probably close the wicket gates slowing things back down
So the first step to generating electricity is having electricity 😂
The first step is having Energy, the ability to cause Motion and Change. Thankfully for us the Sun provides that in abundance. All forms of energy are Solar Powered.
You should consider retiring your rotary exciter and upgrading to static excitation. This eliminates the commutator and brushes and it's more efficient. It is also far easier to automate your power factor control.
Unfortunately working for a city municipality means they will run it until it runs no more. I was surprised they sprung for the uni strut and fancy fittings lol. Just kidding..
.... or am I?
So. How much electricity does it cost, to make electricity?
Once it's running, it makes its own. You only have to put external power in to start it.
:D I’m happy 😃 feel like I got it
Like a car alternator... on steroids. 😁😎
I didn't get it, but I liked it nevertheless.