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Old 02-12-2015, 09:24 PM   #1
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For the High Voltage nerds. You know who you are





400 KV 50HZ AC transformer switching on:







For those suffering with severe insomnia this comes in a dozen parts each 55 minutes long:



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Old 02-12-2015, 09:45 PM   #2
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I'm watching now
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Old 02-12-2015, 10:17 PM   #3
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I'm watching now
Turn up the volume to max in video two, for a real world audio experience.
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Old 02-12-2015, 10:27 PM   #4
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Siemens valve towers:



IGBT modules:

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Old 02-13-2015, 01:51 AM   #5
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really cool stuff!
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Old 02-13-2015, 01:51 AM   #6
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really cool stuff! thanks for sharing!
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Old 02-13-2015, 02:20 AM   #7
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Groovy music in that first clip!
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Old 02-13-2015, 02:28 AM   #8
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indiainternetuniversity.in hehe
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Old 02-13-2015, 09:29 AM   #9
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20 years ago I was lucky enough to participate in some of the testing phases of using IGBT switching technology while working at a Navy testing facility, DC has certain advantages in submarine applications so lots of funding and testing of the HVDC systems we are seeing today came from all that research and testing.
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Old 02-13-2015, 12:27 PM   #10
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20 years ago I was lucky enough to participate in some of the testing phases of using IGBT switching technology while working at a Navy testing facility, DC has certain advantages in submarine applications so lots of funding and testing of the HVDC systems we are seeing today came from all that research and testing.
When the IGBTs turn DC into AC, is it a pure sine wave or is the wave square with something smoothing into a sine wave?
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Old 02-13-2015, 02:28 PM   #11
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Neither, you have 2 opposing (+/-) signals that are either gated on or off, always at full voltage, by changing the timing and duration of these you can shape a pretty smooth effective sine wave.

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Old 02-13-2015, 02:36 PM   #12
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When the IGBTs turn DC into AC, is it a pure sine wave or is the wave square with something smoothing into a sine wave?


I thought it said up to 200 steps .





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Old 02-13-2015, 03:54 PM   #13
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Neither, you have 2 opposing (+/-) signals that are either gated on or off, always at full voltage, by changing the timing and duration of these you can shape a pretty smooth effective sine wave.



Ok now even more confused How does a square go to a sine... I guess Im just not seeing something.
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Old 02-13-2015, 04:02 PM   #14
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Think of the area under each "tower" on curve 3 as a sum of effective energy being equivalent to the smooth sine.
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Old 02-13-2015, 04:10 PM   #15
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Quote:
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Think of the area under each "tower" on curve 3 as a sum of effective energy being equivalent to the smooth sine.
So in essence each one is pulsed in varying magnitude, when the sum of all IGBTs is added together over a half cycle we see a rising or falling sine wave?
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Old 02-13-2015, 04:14 PM   #16
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Think of the area under each "tower" on curve 3 as a sum of effective energy being equivalent to the smooth sine.
But where does AC smoothing and filtering come in?
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Old 02-13-2015, 04:20 PM   #17
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Later
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Old 02-13-2015, 04:32 PM   #18
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Later
Cool

I need to read up more about it anyways, so I can grasp it better.
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