EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: tlhsglm on September 27, 2022, 11:56:33 am
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Hi,
I'm mechatronics engineer, ı'have done lot of circuits but my knowledge is not deep espicially on high voltages.
I want to polarise a chemical. I have seen they are polorasing with this Electrical Safety Testers ; GoodWill GPI-826
https://static.rapidonline.com/pdf/90-6239.pdf
I don't have this machine. I can use it at an university lab. Polarization is done as like this;
https://ibb.co/WzP00vn (https://ibb.co/WzP00vn)
(https://ibb.co/WzP00vn)
I'm curious about this questions;
1-) I've seen devices that provide 5kv 10kv potential powered by 9 volt batteries. The names of the devices I've seen are Insulation resistance tester. Can I do that with step-up converters too?
2-) As you can see at polarisation process we are making an open circuit, therefore can i do it with a simple 200v ac to 12v dc 1a wall adapter and step-up convertors?
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You need to specify how much current you need at 5kV for your experiment.
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You need to specify how much current you need at 5kV for your experiment.
since this is an open circuit there is no current flow i think. only leakage maybe.
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The model you are pointing to is AC voltage not DC. There is a lot of difference (electrically speaking, also probably from the chemical point of view but I'm not referring to this) since steady state current for DC is going to be very low, but for AC depending on the distance between electrodes and area, will surely let more current thru.
Insulation resistor testers are normally DC. You'd need something like an Hipotronics that can generate both AC and DC, https://www.isre.com/specs/hipotronics-hd100-series.pdf (https://www.isre.com/specs/hipotronics-hd100-series.pdf)
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The model you are pointing to is AC voltage not DC. There is a lot of difference (electrically speaking, also probably from the chemical point of view but I'm not referring to this) since steady state current for DC is going to be very low, but for AC depending on the distance between electrodes and area, will surely let more current thru.
Insulation resistor testers are normally DC. You'd need something like an Hipotronics that can generate both AC and DC, https://www.isre.com/specs/hipotronics-hd100-series.pdf (https://www.isre.com/specs/hipotronics-hd100-series.pdf)
Thanks for your reply, that is my mistake, it have to be DC 5000 volts.
Can i do this by adding condansator and diode to 220v ac to 12 v DC 1 a wall adaptor? Like this video(circuit diagram on 2.19)
https://youtu.be/nOootePeSBo (https://youtu.be/nOootePeSBo)
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Don’t be so cheap, that is not safe for many reasons. Find a proper 5kv adjustable power supply or module on eBay
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5kV DC at very low current is fairly easy. Does it need to be regulated? Look at designs for the HV section of CRT monitors or HeNe laser power supplies. A common approach for the latter is to have a self oscillating converter with a transformer followed by a Cockroft-Walton multiplier. a CCFL inverter could be a reasonable starting point if you don't want to design the converter yourself.
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Don’t be so cheap, that is not safe for many reasons. Find a proper 5kv adjustable power supply or module on eBay
Thanks it is an option too right. i want to have a little expriment at first. 100 dollars an hv adjustable power supply.
Also power supply module is dangerous too and i will use both of them with lot of attanchen.
@james_s and @PartialDischarge
Basically i can try with that cheap circuit right?
Let's say i've done the circuit. if i tie 1k resistor to my multimeter's red cable, i can safely (without burning my max 1000volt dc multimeter) measure it's voltage?
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You might want to look at electrophoresis high voltage power supplies, they are made for such testing and polarization of chemicals.
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Let's say i've done the circuit. if i tie 1k resistor to my multimeter's red cable, i can safely (without burning my max 1000volt dc multimeter) measure it's voltage?
definitely not.
if you go into HV terrain, you want to have the right tools for the job. any makedo setup is just asking for desaster.
i'm using a FLUKE 80K-40 for my work on electrostatic loudspeakers, which i can recommend.
https://www.fluke.com/en-us/product/accessories/probes/fluke-80k-40 (https://www.fluke.com/en-us/product/accessories/probes/fluke-80k-40)
as this is a pretty "uncommon" tool, it's fairly easy to grab one on the bay for a decent price.
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Buy one or get hands on help from someone with HV build experience.
Its not so much about the electonics but the quality of build and HV know how.
Genuine HV cable, connectors, enclosure, layout, HV safety relay.... etc.