Author Topic: Loss of voltage on secondary coil  (Read 757 times)

Offline HVuser

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Loss of voltage on secondary coil
« on: October 05, 2021, 07:02:39 PM »
I have a reproducible problem that I believe is my NST. The NST has the secondary ground fault protection (SGFP) with service button. I have voltage on the secondary until the spark sound changes and it drops to 0 voltage. If I measure the primary it is still producing voltage and frequency. I have also noticed if I unplug the power cord for around 1 minute I will see voltage on the secondary. I have measured the voltage wirelessly with DMM I get 14 volts with 700k to 430k hertz when voltage on secondary and 4 volts with 400k to 30k hertz after secondary voltage goes to 0. If I hold the service button of the NST the issue still persist although the frequency will drop to 60 hertz. What I think is happening is that the SGFP is tripping and sending the amperage to the ground. I double checked all my wiring and re-tighten all connections.

My tesla coil setup:
120v variac transformer
6kv NST 30 MA with SGFP
12kv microwave diodes in bridge setup
no capacitor on primary stage
air spark gap of 0.01 inch (in series with primary coil)
primary and secondary coils (ground not attached in testing)

Offline MRMILSTAR

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Re: Loss of voltage on secondary coil
« Reply #1 on: October 05, 2021, 09:30:30 PM »
You can't use those NSTs with GFC to power a spark gap Tesla coil. They will trip almost every time. You need an old-fashioned iron-core-only NST with no GFC.
Steve White
Cedar Rapids, Iowa
Retired electrical engineer

Offline HVuser

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Re: Loss of voltage on secondary coil
« Reply #2 on: October 06, 2021, 12:36:35 AM »
Dang, I will have to locate another another one. The instructions said the NST would work in GFC for up to 30 minutes which was longer then I needed.  I appreciate the information. It would be nice if someone build high voltage potential transfers without SGFP for low cost. I will have to look into Oil Burner Ignition transformers.   Thank you again.

Offline thedoc298

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Re: Loss of voltage on secondary coil
« Reply #3 on: December 24, 2021, 07:08:48 AM »
Dang, I will have to locate another another one. The instructions said the NST would work in GFC for up to 30 minutes which was longer then I needed.  I appreciate the information. It would be nice if someone build high voltage potential transfers without SGFP for low cost. I will have to look into Oil Burner Ignition transformers.   Thank you again.


I put nst in freezer for 3 to 4 hours, then take some small chisels and go to work. I have did many this way. Takes a couple of hours and have to be very careful not to tear wires. Just remove the unnecessary wiring.
 

Offline 55#sofcopper

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Re: Loss of voltage on secondary coil
« Reply #4 on: September 03, 2022, 03:39:32 PM »
Most of the NSTs that I have come across are really easy to remove the protection. If you take off the top of the NST you will likely see the protection circuit in a separate void without potting material. This is true of TransCo, Franceformer, some Actown, and many others. Even when they are potted,  the main wires you need are usually accessible just under the surface of the potting. Just use your multimeter to find the appropriate wires to pthe primary and bypass the protection circuit.  Make sure you unplug it from everything before you attempt any work on it.

High Voltage Forum

Re: Loss of voltage on secondary coil
« Reply #4 on: September 03, 2022, 03:39:32 PM »

 


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