RE: PT Mystery - PT Datasheets

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Mccauley, Daniel H by way of Terry Fritz <teslalist-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>


Here are the datasheets etc... for the GE Potential transformers.  Perhaps
this information may be of help.

http://www.geindustrial-dot-com/multilin/products/transfrm/indvolt.pdf

http://www.geindustrial-dot-com/multilin/products/transfrm/guide.pdf

http://www.geindustrial-dot-com/multilin/products/transfrm/applinfo.pdf


The Captain


 > I just got a GE JVM-5 1500 VA 14,400/120 PT that's
 > doing strange things. At first I thought it was
 > defective, since I only measured 6 kV out with 120 in.
 > I was using a WaveTek 27 XT and a WaveTek HV probe.
 > After much playing, I determined that this thing
 > appeared polarized compared to my pig and my nst. My
 > HV probe has a black ground and a probe. Neither my
 > nst nor my pig care which side is connected to which
 > bushing. I always get a good reading. However my PT is
 > different:
 >
 > The PT has two studs on top and one on the side.
 >
 >    1        2
 > __|________|__
 > |            |
 > |            |
 > |    PT      |
 > |            |-3
 > ---------------
 >
 >
 > When I connect the probe ground to 1 I get 12.9 kV on
 > 2 and 17.5 kV on 3.
 >
 > When I connect the probe ground to 2 I get 5.8 kV on 1
 > and 6.3 kV on 3.
 >
 > When I connect the probe ground to 3 I get 17.8 kV on
 > 2 and 13.8 kV on 3.
 >
 > I was feeding it 121.1 v in.
 >
 > Any ideas why my 27XT set for AC with a HV probe
 > appears to be polarized? Does anyone know what the
 > three studs go to?
 >
 > thanks
 > Adam
 >