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Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
Hello 4hv,
Im currently looking into getting a Saturatable reactor made. I have a friend who can wind transformers fairly cheaply, but he doesn't want to do a saturatable reactor as he has tried before, done the theory/math and it didn't work. Does anyone have any good information on them? im looking for somthing that can handle up to 10kW as im thinking of having 2 made and putting them together for 20kW.
Any information anyone can provide? i have been searching for some time with little sucess.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
You can achieve pretty much the same thing using a smaller ordinary inductor with a phase angle controlled triac or pair of SCRs in series. Saturable reactors are a throwback from before these were invented.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Hiya Thomas,
I'm probably the last living member of this forum who uses LCLC HT filtering, and then only because I have the giant inductors to hand.
Nowadays, electrolytics are availlable at both high voltage and high capacitance, so the days of swinging chokes are gone.
I've got loads of unused HV electrolytics around , so if you need a few, I'll be happy to send them on, rather than waste money on things you don't need.
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
Proud Mary wrote ...
Hiya Thomas,
I'm probably the last living member of this forum who uses LCLC HT filtering, and then only because I have the giant inductors to hand.
Nowadays, electrolytics are availlable at both high voltage and high capacitance, so the days of swinging chokes are gone.
I've got loads of unused HV electrolytics around , so if you need a few, I'll be happy to send them on, rather than waste money on things you don't need.
Stella.
Stella, Thank you for the offer, what are the ratings of the high voltage electrolytics? Also im a bit confused what the filter has to do with the saturatable reactor im talking about XD
Steve, I admit while that is true, i wouldn't know anything about setting up the control circuit of such a system and other things. How heavy would such a saturatable reactor be anyway? I admit i just fine the Reactors really cool too. but doing SCR fired control is very much a possibility too.
The main idea for me to do is to make this current control for my Potential transformers and any other mains frequency transformers i may be running. However I may well use the output rectified for my x-ray transformer drivers and so on.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Steve Conner wrote ...
You can achieve pretty much the same thing using a smaller ordinary inductor with a phase angle controlled triac or pair of SCRs in series. Saturable reactors are a throwback from before these were invented.
Exactly. Even the simple "TRIAC/DIAC" circuit often works well and it can be scaled up to control two antiparallel SCRs, etc.
Registered Member #42796
Joined: Mon Jan 13 2014, 06:34PM
Location:
Posts: 195
Thomas W wrote ...
I admit while that is true, i wouldn't know anything about setting up the control circuit of such a system and other things.
I'm currently building such a phase angle controller... In fact is nearly finished - just have to put all together in a box. I used Steve design with slight modifications
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
Dr. Dark Current wrote ...
Steve Conner wrote ...
You can achieve pretty much the same thing using a smaller ordinary inductor with a phase angle controlled triac or pair of SCRs in series. Saturable reactors are a throwback from before these were invented.
Exactly. Even the simple "TRIAC/DIAC" circuit often works well and it can be scaled up to control two antiparallel SCRs, etc.
Thing is, im more interested in an actual 50Hz waveform. just like a saturatable reactor does.
I've been thinking simply Variac -> Saturatable Reactor (or maybe ballast array) -> High voltage, mains frequency transformer.
Maybe im missing somthing about these suggestions...
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Thomas W wrote ...
Stella, Thank you for the offer, what are the ratings of the high voltage electrolytics? Also im a bit confused what the filter has to do with the saturatable reactor im talking about XD
I think I got the wrong end of stick theere, Thom. To me 'saturable reactor' means 'swinging choke' as we see in high quality vintage PSUs.
I can still spare you a few new unused 400V/450V 10,000 μF if they might help. Make a contribution of £10 in my name to 4HV (to cover postage) and they're yours.
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
Proud Mary wrote ...
Thomas W wrote ...
Stella, Thank you for the offer, what are the ratings of the high voltage electrolytics? Also im a bit confused what the filter has to do with the saturatable reactor im talking about XD
I think I got the wrong end of stick theere, Thom. To me 'saturable reactor' means 'swinging choke' as we see in high quality vintage PSUs.
I can still spare you a few new unused 400V/450V 10,000 μF if they might help. Make a contribution of £10 in my name to 4HV (to cover postage) and they're yours.
Ah i see. Well im not going to say no to that! :)
I will send you a message when i have done so with my address.. Thanks! :)
Im still searching for saturatable reactor information.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Thomas W wrote ...
Thing is, im more interested in an actual 50Hz waveform. just like a saturatable reactor does.
The saturable reactor distorts the waveform too, and the distortion is not that different to what you get with an ordinary inductor and SCRs.
I've seen one made from two MOTs with the primaries in parallel and secondaries in series, wired so that the induced high voltage cancels out. You apply a DC control current to the secondaries, and the current gain is about 10.
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Saturatable Reactor
