Electronics > Beginners
Can a variable thermal shut off circuit be build?
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coppercone2:
honestly I don't know if you should be hooking up anything 50A with alligator clips, its kind of like you need to build a proper hookup to the experiments with heavy ferrules and screw terminals and stuff.

Who the hell prototypes 50A shit in the fly? It's kind of nuts.

Those experiments require so much thought to run properly that maybe, its a good idea to be slowed down by having to make a special wiring fixture rather then just slap some alligator clips on it.

EZ-high voltage is not a good idea either. I don't know who the hell deals with so much high current parts so quickly, a navy yard? Almost everything you hook into 100A is either gonna be really expensive, or really hot (and some what expensive), not to mention heavy, unweidly, ugly. Even a factory should have the time to do proper fixturing.

and it can explode, so its a bad idea to not have it in a enclosure anyway?
CatalinaWOW:

--- Quote from: coppercone2 on August 05, 2019, 10:22:29 pm ---honestly I don't know if you should be hooking up anything 50A with alligator clips, its kind of like you need to build a proper hookup to the experiments with heavy ferrules and screw terminals and stuff.

Who the hell prototypes 50A shit in the fly? It's kind of nuts.

Those experiments require so much thought to run properly that maybe, its a good idea to be slowed down by having to make a special wiring fixture rather then just slap some alligator clips on it.

EZ-high voltage is not a good idea either. I don't know who the hell deals with so much high current parts so quickly, a navy yard? Almost everything you hook into 100A is either gonna be really expensive, or really hot (and some what expensive), not to mention heavy, unweidly, ugly. Even a factory should have the time to do proper fixturing.

and it can explode, so its a bad idea to not have it in a enclosure anyway?

--- End quote ---

There are times when it is appropriate.  The power lab back at university had patch boards with various voltages of three phase current.  4/0 jumper cables.  Made hooking up large motor and generator experiments easy.  Also made for spectacular results on some kinds of mistakes.  There is an argument for discovering these mistakes and their rather large consequences in a relatively benign environment instead of a remote field location, far from knowledgeable people, medical help and other useful items.
coppercone2:
are two screw terminals and a drawer filled with various thermostats really going to slow things down that much? its 100A

its hilariously lazy/'efficient'  you will tire out swapping 100A components from the weight like 100 times faster then you would save time from leads.

this is like, an automated probing jig of the future in some fully automated industrial robotics factory. It's hard to imagine when it would actually even make economic sense in a factory. I don't think you can even make 100A components fast enough right now to justify that, let alone find a buyer for that volume. Anything that runs at 100A right now is just ridiculous. Maybe if a full home energy storage system sold for like 150$. And even then I think osha would kill it being 100A.

I am imagining a big copper block with a thermostat on it, with a eyelet for a screw terminal or pin that goes into a screw terminal or something. Its like a bus bar territory.  It would basically be a bus bar with a thermostat on it that connects to other bus bars? I have NO idea.
FriedMule:

--- Quote from: coppercone2 on August 05, 2019, 04:35:10 pm ---the main problem I see is that your temperature sensor is running in parallel with wires carrying 100 amps.

--- End quote ---
The whole circuit is driven by 9V until the voltage regulation that are making 6V, it is only the U6 that should be "touching" the 100A

Since my knowledge is about zero, you are super welcome to change, delete or do anything with the circuit. One missing function is now that it can't tell what max temp are set to.
FriedMule:

--- Quote from: coppercone2 on August 06, 2019, 06:45:25 am ---are two screw terminals and a drawer filled with various thermostats really going to slow things down that much? its 100A

its hilariously lazy/'efficient'  you will tire out swapping 100A components from the weight like 100 times faster then you would save time from leads.

this is like, an automated probing jig of the future in some fully automated industrial robotics factory. It's hard to imagine when it would actually even make economic sense in a factory. I don't think you can even make 100A components fast enough right now to justify that, let alone find a buyer for that volume. Anything that runs at 100A right now is just ridiculous. Maybe if a full home energy storage system sold for like 150$. And even then I think osha would kill it being 100A.

I am imagining a big copper block with a thermostat on it, with a eyelet for a screw terminal or pin that goes into a screw terminal or something. Its like a bus bar territory.  It would basically be a bus bar with a thermostat on it that connects to other bus bars? I have NO idea.

--- End quote ---
The thermal relay is meant to shut the test lead's power off if my test point is getting to hot, lets say that after3 minutes a component goes higher then max temperature I allow, then does the relay trigger. The same if I am testing a PSU for several hours, if the heat gets to great, it shuts everything off so nothing is starting to burn.
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