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Registered Member #818
Joined: Mon Jun 04 2007, 08:00AM
Location:
Posts: 2
If i parallel two 12KV NSTs to run at 24KV from the secondary output will it re-enter the transformers at 24KV and ruin them? If so, how can i prevent this?
Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
If you parallel two 12kV30mA NSTs, you wil get 12kV60mA. Putting the two in series will give you 24kV but this is not advisable as the insulation within the transformer is not built to withstand that voltage.
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
There are two ways you can see if they are phased correctly:
You can power both of them up with a variac and see if you can draw an arc between the terminals of NST1 and NST2. If you can't then you should connect them together for one terminal, and connect the other two for your second terminal. Of course, the power if off when you do this.
You can also connect a voltmeter between the terminals of NST 1 and 2 and slowly power them up with a variac. If they are phased correctly then the voltage difference will be small, like 0 to 100v. If you have them connected out of phase then the voltage will rapidly increase as you increase the variac.
Be careful as most voltmeters don't go above 750v AC and you will blow your meter if you increase your variac too much. Each volt going in converts to 130v coming out for a 15kv NST, so this means you only have to turn the variac up to 6v before blowing the meter.
Registered Member #477
Joined: Tue Jun 20 2006, 11:51PM
Location: Seattle, WA
Posts: 546
Just use the draw-an-arc approach to phasing NSTs. There's no reason to bother with any other method.
If you were phasing pole pigs, the bring-it-up-slowly-with-a-variac approach is warranted, but use a reversed NST or something to transform the 14-15kV back down to 0-120V for your meter. Don't connect your DMM to the output of your NST or pig. That is just begging to wreck your DMM ... maybe you!
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Primary Circuit issues
