Recent content by mooliak

Hi all, I have a problem which is quite basic, and I must be missing something. Fe 3+ + e > Fe 2+ +0.77v O2 + 4H+ + 4e > 2H2O +1.23v Re arranged, this tells us that if we bubble air through iron 2 sulphate solution, acidified with H2SO4, the oxygen should oxidise the Fe 2+ to Fe 3+...

Hi All, I have access to a 15kW VFD for little money. I only have single phase 240 vac at home, and need to drive a 10kW motor, 3 phase, 415v. I have been reading that 3 phase input VFDs can be run on single phase, but they must be derated by 50%. This would mean a 20 kW VFD. Also, it is a...

Skaperen, sorry for delay in answering, I'd put it on the back burner. This is a refining type project, so current limiting is by the size of the electrodes, it is inherent in the cell design. 66V is rather high, as in refining, with cell voltage at ~ 0.5 V, this represents a lot of cells in...

Point taken about the iron core. It's presumably the fact that it goes UP the core of one coil and down the core of the next coil that was fooling me. I guess that due to the 3 phases, if the flux of one phase is high, the flux of the next is low, so its core can be used for energising the...

Just a thought, Jim. This might sound like awful butchery, but I did mention that as there is no core between the coils, it would be easy to cut the core, top and bottom in 2 places with a Stihl saw, and make 3 separate coils. Obviously, I can experiment with it in 3 phase mode first, to gain...

Edit: second thoughts for improved clarity. My problem is that I think I have argued soundly that the separate copper electroylsis reaction will work continuously. However, instinctively, and reading articles on copper refining, there is no evidence of such a cell operating, and all the...

Thanks Jim, I will keep you posted, but it won't be immediate as I need to get it into my workshop from the farm next door where it's in storage, and that will take a bit of doing. Regarding your suggested experiments, I will do them because I don't like to not understand things, and my...

Hi all, I have some history in practical electrochemistry, and have, I think, a reasonable uderstanding of the basics of Redox reactions and ½ cells. Recently, I have been thinking about a project, and it has me in a complete quandry. There’s probably something obvious that I’m missing, but...

Why do they get it on about oil cooled transformers?

Hi Jim, Thanks for your input. ITLO what you said, it would probably be best to wire all 3 in parallel and thus divide the current equally, unless that in itself would cause a problem. I think I was obsessed with it trying to emulate 3 output phases from the one input. Do you think the...

I need a 10-15 : 1 step-down transformer for an electrolysis project. It needs to be capable of about 150A. I have an old ex-military transformer/rectifier, but it outputs 200A at upto 230V DC. It has a humungous transformer in it , and some banks of BIG diodes, so if I get a variac from ebay...