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Registered Member #54386
Joined: Sat Jan 31 2015, 08:28PM
Location:
Posts: 8
Hey guys,
I was hoping you might be able to help me ID a transformer. And if not, help suggest how I might test to find out what the original specs were close to. I know I can prob feed in a low voltage and measure what I get on the secondary... But what about maximum values to not exceed?
It has two leads from what I think are the primary, who's wires are much much thicker than any mains wiring I have seen. And there is one wire coming from the inside, and a large solder pad centred on the wax paper winding which I think make the secondary. It is at least 3x the size of a big MOT and says EL-COR and A519 on the core and written on it is gv-2710 and possibly an ohm symbol.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
The thick wires are actually the secondary winding in the original use of a potential transformer.
Output ranges are typical 100 to 380 VAC from 10kV on the primary side.
The inner lead from the high voltage primary winding is usually grounded to the core and enclosure.
If we assume its a 10kV to 100V transformer, you should not go above 6V in if you only have a regular DMM to measure the output with, since that would already be 600V.
Registered Member #54386
Joined: Sat Jan 31 2015, 08:28PM
Location:
Posts: 8
No signs of being in oil (not messy). Do you have any suggestions for what I should expect as the resistance and/or inductance for the windings if undamaged? (This guy looks undaged, possibly never deployed)
And the DMM always read a bit higher than the variac's output voltage, suggesting something around 25ish times step down when run forwards. So I guess this is probably meant to be 10KV to 380V step down.
I then immediately substituted it in place of the full-wave rectified (ungrounded secondary) MOT in a GK-71 base-fed HFVTTC (which uses a string of caps for feedback instead of the plates like RateReducer's) operating at 16 MHz. Now I need to find something that can handle the discharge temp better than tungsten, lol.
Is there any way to figure out what safe current I can draw from this thing running it backwards (as a step-up) transformer, especially when feeding it 120V instead of 380?
And the DMM always read a bit higher than the variac's output voltage, suggesting something around 25ish times step down when run forwards. So I guess this is probably meant to be 10KV to 380V step down.
I then immediately substituted it in place of the full-wave rectified (ungrounded secondary) MOT in a GK-71 base-fed HFVTTC (which uses a string of caps for feedback instead of the plates like RateReducer's) operating at 16 MHz. Now I need to find something that can handle the discharge temp better than tungsten, lol.
Is there any way to figure out what safe current I can draw from this thing running it backwards (as a step-up) transformer, especially when feeding it 120V instead of 380?
The current rating is the same with lower voltage, the wire gauge does not magically increase with lower voltage :)
TDU runs two potential transformers in series, both rated 30VA, at 18kW:
These transformers were built for eternity service in high voltage sub stations, they are brutally built.
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Help IDing a HV potential transformer
