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Akula eternal lantern 4

Started by MenofFather, June 01, 2014, 01:15:57 PM

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MarkE

#325
March 26, 2015, 04:06:04 PM
Quote from: forest on March 26, 2015, 03:52:41 PM

MarkE


If I use rectified and filtered DC say like 320-340VDC straight to my heater elements how can I protect circuit from shortcircuit to water or leakage current to ground ? Would the odinary 230VAC protection breaker work with DC ? do you know any commercial solution for such protection on DC line (except barebone fuse) ?
DC arc protection is expensive.  The problem is that as the breaker attempts to open the DC voltage forms an arc across the air gap that then has to be extinguished.  An ordinary AC breaker will not provide good protection.  A DC rated fuse will, such as one of these:  http://ep-us.mersen.com/fileadmin/catalog/Products/Fuses-Fusegear-and-Fuse-Systems/Special-Purpose-Fuses/DC-Fuses/440VDC-Size-14x51-22x58-27x60-GLB-Cylindrical-Fuses/ADV-G-Special-Purpose-Fuses-440VDC-Ferrule-Fuses-14x51-22x58-27x60-Cylindrical-gLB.pdf

mscoffman

#326
March 27, 2015, 08:41:46 AM
One way is to use a DC rated contactor and a crowbar safety circuit...Then just switch the circuit off.

MarkE

#327
March 27, 2015, 11:15:26 AM
That works if you don't mind spending more than $500. on the DC rated contactor.

eugene900

#328
May 03, 2015, 09:05:02 AM
replica
not working  :P
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