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open delta bank
single bushing pots - lighting pot hooked up normal, power pot X3 bushing hooked to X3 on lighting pot and X1 voltage will be what? regular wild leg voltage (208v-215v)? fault? a freind of mine and I disagree on the output on this build just throwing it out there to other linemen.
Are both transformers the same polarity? If not I am guessing 120 volts.
Last edited by Lineman North Florida; 11-21-2011 at 03:58 PM.
yes both are additive (regular distribution), let's 50KVA lighting pot and 10KVA power pot
single bushing pots?
You kind of lost me with the term single bushing,on the high side,19.9?Why would you even try that if you knew the correct way.Or are you saying both pots have different polarities,and if so maybe try rolling the high sides.Personally ive only had one instance where pots were different polaritys.and that was ,if i remember right a 167kva 2 bushing pot and a 3 bushing pot,i may be wrong ?But wait,,i think i got you now,,,,,,,,,,i think you would blow a fuse wiring it that way,x3 tied to another x-3 you would cause it to buck.Originally Posted by Redbeard3261
If they are both additive or subtractive you can not connect both X3s together you will blow a fuse.
That's what I meant, I was thinking that maybe 1 was additive and the other subtractive.
Along those same lines, once after a major hurricane we got in a bunch of transformers from a bunch of different company's, it was about 2:00 AM and I had a desroyed 2 pot bank so I built a new one, closed it in and some of my co-horts started laughing and said I had messed that one up as we had some outrageously high voltage on the kitty leg, we had the meter pulled as was our policy, I told them that the bank was built right as at that time I had probably built over a hundred of em, well sure enough the voltage was off the chart, I asked if anybody checked the polarity of the pot that came from somewhere else and no one had. I went back up and there it was on the back side of the pot ( a dual voltage switch ) at that time I knew it was a subtractive pot and I had wired the bank for two additive pots therefore I had the X1 on the additive tied to the X1 on the subtractive pot, I fixed it on the secondary side and wired it X1 to X3 as I figured it would be easier for someone to spot than swapping 1 of the topsides and might keep someone from making the same mistake I made.
Do you guys use single primary bushing pots on an open delta 2 pot bank?
I always thought you had to use double bushing transformers?
The high side of all of our pots are 2 bushing.
correct me if im wrong
Usually on our 12 kv pots there are 2 primary bushings,while our 34.5 system transformers are single bushing pots on the high-side,the case ground is considered the other bushing ,understand ?OR ground.
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