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Re: Setting up a pole pig's wiring



Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Bart,

Im still a little confused on your meaning of "tap wiring". To me, tap means an intermediate connection to a coil and implies there are two other possible connections on both sides of the coil. If this is how you are using the term, then H1 connects to one side of the HV coil and H2 connects to an intermediate point on the coil and then I'm wondering what the other end of the coil is connected to. I suspect you are using "tap" to mean a connection to the inner winding of the HV coil (H2) and H1 connects to the outer winding of that coil.

I think from what you say, there is only one HV coil that is wound on top of the LV windings. There must be insulation between the LV and HV coils that must standoff a significant voltage, but the breakdown from H2 to LV must be lower than from H1 to LV or core. Is this interpretation correct???

Have people ever had problems not grounding H2, but instead leaving the HV outputs floating???

Gerry R.



Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

H1 is connected to a bushing and one outer hv winding.
H2 is connected to a bushing. The wire from the bushing is the common to the tap. The tap wiring (1 through 5) run down between the LV and HV windings attaching near the bottom of the winding. There is no hv center connection to the core. It's a single winding which is wound around the LV winding. H1 appears to be nearest the inside of the coil, so the H2 would end up towards the outer side nearest the outer core. That's why I referenced H2 to RF ground. However, I doubt it makes any difference which hv bushing runs to the core, otherwise, we probably would have had issues in the past by now.

Two HV coils would make no sense (electrically) for single phase buck-boost transformer (a few hundred volts). My diagram on the pig for the hv side shows a single coil with the tap diagram in the center, however, that doesn't indicate two coils. The taps must be on one end of the winding for the typical few hundred volt taps.

Take care,
Bart

Tesla list wrote:

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Bart,

When you say H2 is the side closes to the core, are you saying the inner winding of the H2 coil goes to the bushing. Could you describe the HV winding geometry?? one coil or two??? and how the inner/outer windings are connected??? My nameplate suggest two HV coils, but if this is the case, it would make no sense to me why the inner winding of one of the coils would be brought out to the HV bushing. Everything you have said would make perfect sense if there was only one HV coil.

Gerry R.