BTT NST
Nik, Fri Feb 16 2007, 02:12AMI have a 7.2kv 35ma NST and it has some quircks, I was wondering if any one has encounterd this before. (it is a "ground fault compliant" xfmr btw")
Lable info:
Allanson
ss935B
Self adjusting for 2kv-9kv load
primary 120v 60hz 110va
sec 7200vrms 35ma
complies with seconday groundfault protection requirements
I can draw an arc that is thick and hot just as expected but as soon as it goes out the nst stops its output. I can't draw anymore arcs until I turn off the unit and then turn it on. If i turn the unit on with the electrodes too far apart (so they wont arc) the unit will not power up.
When rectified (half wave) I can draw an arc and it will go out when i draw it far enough. After the arc is out there will be a corona. I can make the corona stay for as long as i want but if i pull the electrodes too far apart the unit stops all its output and i have to shut it off. If I power the unit up with the electrodes too far apart the unit will not power up and has to be turned off and then on again for an arc to be drawn.
(BTT stands for "balls to this")
Re: BTT NST
Billybobjoe, Fri Feb 16 2007, 02:28AM
I have one of those too - two at first but I traded one. See here:
Billybobjoe, Fri Feb 16 2007, 02:28AM
I have one of those too - two at first but I traded one. See here:
Re: BTT NST
Nik, Fri Feb 16 2007, 04:24AM
Thanks for the link but the NST I have runs at 60hz (output) for sure. The arc makes the same hum as a mot arc and if you were to be holding the insulated part of the wire there is a low frequency "vibration" (capitive coupling I guess). Ill try to get it open in the near future but it is riveted shut for now.
Nik, Fri Feb 16 2007, 04:24AM
Thanks for the link but the NST I have runs at 60hz (output) for sure. The arc makes the same hum as a mot arc and if you were to be holding the insulated part of the wire there is a low frequency "vibration" (capitive coupling I guess). Ill try to get it open in the near future but it is riveted shut for now.
Re: BTT NST
Steve Conner, Fri Feb 16 2007, 01:17PM
I bet it is solid state. Some of the solid state ones modulate their output at 60Hz to get better power factor.
Steve Conner, Fri Feb 16 2007, 01:17PM
I bet it is solid state. Some of the solid state ones modulate their output at 60Hz to get better power factor.
Re: BTT NST
Bjørn, Fri Feb 16 2007, 02:08PM
Steve is right, Google finds Allanson SS935B listed as an electronic (solid state) transformer.
Bjørn, Fri Feb 16 2007, 02:08PM
Steve is right, Google finds Allanson SS935B listed as an electronic (solid state) transformer.
Re: BTT NST
Nik, Fri Feb 16 2007, 10:33PM
It occured to me later today that you were right about it beign solid state. 60hz equipment rarely has corona from an insulated wire. Thank you for your assistance, I'll see what i can do with it.
Nik, Fri Feb 16 2007, 10:33PM
It occured to me later today that you were right about it beign solid state. 60hz equipment rarely has corona from an insulated wire. Thank you for your assistance, I'll see what i can do with it.
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