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Registered Member #816
Joined: Sun Jun 03 2007, 07:29PM
Location:
Posts: 156
Nice Lucky find, Though if it were me I don't think I'd have the confidence to buy the lot, As I would wonder what such expensive parts were doing in a scrap yard to begin with. Maybe the equipment was just broken up for the copper and the components are fine, or they came from an overhaul because a few were dud they replaced the lot.
I don't know if you can test these like mosfets where if you charge the gate up with a power supply they will stay conducting until the charge gradually leaks away by itself. Leaky ones will turn off faster than those that are good, so you can identify suspect ones. I've used this technique with TO247 fets but don't know if it's true for anything this size, long as they don't have internal gate grounding resistors of course.
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
Electra wrote ...
Nice Lucky find, Though if it were me I don't think I'd have the confidence to buy the lot, As I would wonder what such expensive parts were doing in a scrap yard to begin with. Maybe the equipment was just broken up for the copper and the components are fine, or they came from an overhaul because a few were dud they replaced the lot.
I don't know if you can test these like mosfets where if you charge the gate up with a power supply they will stay conducting until the charge gradually leaks away by itself. Leaky ones will turn off faster than those that are good, so you can identify suspect ones. I've used this technique with TO247 fets but don't know if it's true for anything this size, long as they don't have internal gate grounding resistors of course.
Do you have anything in mind for them?
Already tested a pile of them and determined they were all ok before buying the whole lot. You could see they were completely un-used other then just sitting on the shelf. They were likely a canceled order as they were made by a company in Derby for another company that sold them to electric car manufacturers we worked out.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Nice! Can you post another link to the IGBT datasheet, the link you supplied didn't work. They might be really good for smaller DRSSTCs in which case you have to make one.
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
Steve Conner wrote ...
Nice! Can you post another link to the IGBT datasheet, the link you supplied didn't work. They might be really good for smaller DRSSTCs in which case you have to make one.
Small DRSSTC? i believe you could make some rather large DRSSTCs with these.
Registered Member #103
Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
Not quite as epic as the IGBT haul, but I had a mini haul earlier today, again from Derby
No idea why, but I decided to score myself this 15kVA three phase transformer and a small variac (complete, just in bits).
The transformer is still in my boot, because I can't get it out It took two of us to lift it in, and when it landed in the boot it bust through the floor into the spare wheel compartment I also have no idea what I'm going to do with it (but being a three phase core, it can be used to wind a single phase transformer but with half the flux (through the center leg) than would normally be possible with a proper single phase core).
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