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Hi Sven,
Thank you..... now I understand better what you are doing.
On Mon, Dec 18, 2017 at 6:59 PM, 'S.friedrich' [email protected] [EVGRAY]
<[email protected]> wrote:
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> Hi Gerry, in Hector last Transverter Posting he has switched 2 coupling
> capacitors between diode plug circuit and transverter. This can only be a
> sheath current filter as it is used in Bnc lines to suppress common mode
> noise, I think malfunctions that are caused by the switching of the
> thyristors when they switch load. Greetings Sven
> Von Samsung Mobile gesendet
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> -------- Ursprüngliche Nachricht --------
> Von: "Gerry [email protected] [EVGRAY]"
> Datum:17.12.2017 23:24 (GMT+01:00)
> An: [email protected]
> Betreff: Re: Re: Re: [EVGRAY] Oscilloscope problematic.
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> Wow Sven,
> That's a heavy duty shunt you have there!
> The big bolts are to carry the large current under test in and out of the
> resistor via brass blocks on either end.
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> The two smaller connections are the voltage measuring points, the
> resistance is correct between these two points.
> It is correct to place your measuring device here, but like me & Ole
> said.... have to pay attention to your earthing points.
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> I can see a high current connection to the left end but not the right hand
> end of the shunt?
> Where does this current come out?
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> I don't exactly understand your words in your email above "I still need
> capacitors for the sheath current filter because I lie partially over 600V,
> or in series...."
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> Do you mean the whole shunt is floating at 600V above/below ground
> potential?
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> Sorry... me easily confused
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> Since shunt is intended for up to 200A and you are only using it at 35A
> the voltage per amp is going to be quite small.
> So noise and contact potential errors may creep in through dissimilar
> types of metal at junctions.
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> I do recommend to try a clip on type ammeter or Hall effect probe for
> these kinds of measurements.
> Gerry.
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> Here is a link to some other shunt resistors also
> https://www.jaycar.com.au/search?text=current+shunt&
> CSRFToken=0cf93697-a46e-4fc8-ada7-969a3dc631c3
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> On Sun, Dec 17, 2017 at 10:53 PM, 'Sven Friedrich' [email protected]
> [EVGRAY] <[email protected]> wrote:
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>> Hi Gerry, I measure at this shunt. The small lines that are led out, I
>> connect to my scope..
>> I think 200A max. rich for my max. 35 amps in transverter reactive.
>> I still need capacitors for the sheath current filter because I lie
>> partially over 600V, or in series.
>>
>> regards
>>
>> Sven
>>
>> *Gesendet:* Sonntag, 17. Dezember 2017 um 02:31 Uhr
>> *Von:* "[email protected] [EVGRAY]" <[email protected]>
>> *An:* [email protected]
>> *Betreff:* Re: Aw: Re: [EVGRAY] Oscilloscope problematic.
>>
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>> Hi Sven,
>> Sometimes the high current shunts are 4 terminal resistors.
>> Usually the two larger terminals are for the current in and out
>> connection.
>> The actual nominal value of resistance is only correct between the
>> voltage terminals.
>> Which aren't designed to carry large currents.
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>> They are also calibrated in so many nominal mV per Amp rather than Ohms.
>> Gerry
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