Rehash.

[wtdoor67]

Memory check. We had a severe washout (flood) on the Wa****a. It took about 10 spans of overhead, 4 wire 7620/13200 out. River crossing and the whole 9 yards.

All that was left was the REC line which ran over our dead section of line. It was 14.4/24.9 and still good.

Our dead section of line served about 2 or so 3 phase banks and about 6 single phase (residences). Going back with the original line etc. was out of the question. This happened the evening of a weekday. The only thing thought of was building about a mile of line. We were out there of course, 2 foremen and 2 linemen. Yours truly had a brain storm and with another hand (the other lineman) we saved the pwr. co.'s sorry ass on this little matter. We didn't even get an attaboy. What did we do? No there was no portable or anything of that nature. We didn't even have acess to Swamprat.

[slimdalineman]

did u change out all the transformers to 14.4 and jumper up to the 14.4/24.9 that ran over your dead line?

[wtdoor67]

That would have entailed probably re-insulating quite a bit of line and of course changing out all those pots.

We hadem back on just before daylite the next morn. We had a bunch of other crap going on to. Pretty good storm and rain.

[topgroove]

I suppose you could build a three phase bank on the 14.4/24.9 and use the secondary to backfeed a bank of 100kva's on the 7620/13200. you'ld have to build two banks but if each crew each did one it wouldn't take that long.

[Trbl639]

I suppose you could build a three phase bank on the 14.4/24.9 and use the secondary to backfeed a bank of 100kva's on the 7620/13200. you'ld have to build two banks but if each crew each did one it wouldn't take that long.

X2........

[wtdoor67]

I suppose you could build a three phase bank on the 14.4/24.9 and use the secondary to backfeed a bank of 100kva's on the 7620/13200. you'ld have to build two banks but if each crew each did one it wouldn't take that long.


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Indeed that's what we did. The idea was put forth by myself and the other lineman. We were in separate vehicles, so that adage of great minds work together is true.

The whole thing was good fortune. We did not have 14.4/24.9 in our system, however we used pots of that voltage in phase to phase applications for some oil field stuff on 13.2 KV. When I mentioned we could do this to the foreman I was riding with he said. Well our boss had always gotten along with this particular REC. Had it been the other REC they would have told us to pound sand. We opened the jumpers on a nearby DE pole thus separating the downed part of the line from that we intended to use. We built a Wye/Wye bank of 480 pots with 14.4/24.9 primary on the REC line. We ran quad across to our step up bank built of 480 pots with 7.6/13.2 pots. Of course they were connected Wye/Wye also. The only thing that ocurred to me, and I didn't mention it, was with this connection the quad would have been subjected to, I guess, 832 volts. I always thought overhead quad and triplex was only rated to 600 volts. It worked though until a contractor came in and rebuilt the downed section. We were so lucky that the rotation came out right and I remember the single phase voltage at one location was 118 volts, which was sufficient.

The REC was intrigued and came out and took pictures of the setup. Prior to disconnecting it all meters in this section were read. Wherever the outage came in the billing cycle I don't know but I guess the REC made a little juice. I thought they were pretty decent through the whole thing.

On an aside a Union contractor did the rebuild and ****ed if an apprentice didn't fall from a pole and severely injured his back. Just a simple cutout and fall. Before the Bucksqueeze. Blimey.

Like I said it was all credited to me and the other hand and we didn't even get a "good job guys" or an attaboy. Such was our management. They loved us.

[johnbellamy]

Atta Boy!!!!!

I was gonna respond but you already told me about that one.

[wtdoor67]

Better late than never.

[rcdallas]

I'll buy you a beer...still WAITING for my book to show up.

[topgroove]

You did a fine job Door! so many times we remarkable things to get the customer back in power that management dosen't appreciate. Thank god the line supervisors in my barn are all ex-lineman.:)

[wtdoor67]

Okay R.C. You've got a 3 pot Wye/Delta bank. Fed by underground, but ending in an overhead bank. You accertain that one of the URD phases is bad.

With the use of amp tongs you go to the bank and although no bank fuses are blown you can tell which phase is dead. You know with only 2 phases feeding, it will be sufficient to handle the load. Step by step, what do you do to quickly restore 3 phase power?

[topgroove]

I don't want to blow it here but RC must build banks like that all the time down in Texas!

[rcdallas]

Okay R.C. You've got a 3 pot Wye/Delta bank. Fed by underground, but ending in an overhead bank. You accertain that one of the URD phases is bad.

With the use of amp tongs you go to the bank and although no bank fuses are blown you can tell which phase is dead. You know with only 2 phases feeding, it will be sufficient to handle the load. Step by step, what do you do to quickly restore 3 phase power?

More or less I'll just make a open wye open delta bank.

BUT you asked for step by step you said QUICKLY restore power...I'm sure it could be done many ways, however I'll run with this, and correct me later.

I'd open up the bank, you never mentioned if it was a 120/240 or not, I'll just say that it is. I'll open up the power pots, then my lighting pot.

Then I'd go to the customers disconnect and open it...now I just saw someone had marked rotation inside the meter base for me, dated 5 months ago. Nice guys.

I'd remove my long tie bus on one side, I'd tape up the floating connection so it can't get into anything on the outside power pot, I'd then take the hot leg and move it over back to my unused bushing on my lighting pot

Close in my lighting, then my power, goto the disconnect check voltage, rotation close the disconnect and call a crew. :)

Really would be nice if it was always a clockwise rotation but nobody seems to care so I won't go into leading and lagging.

Tell me if I missed anything.

[topgroove]

Good job RC:) personally I think the question was a little beneath you! I got the feelling you've built a few open delta banks:cool:

[wtdoor67]

Remember R.C., there's no bad pots in this bank, only one dead phase coming into it. That's why it will work.

First thing is know which phase is dead. Amp tong might tell you.

2nd thing, open all three cutouts. (I used to think about that lighting pot last and first, but unless you're clumsy, don't worry about it)

3rd thing, ground the hi side "floater". Couple of hotclamps and # 6 cu.

4th thing, close the cutouts only on the "hot" phases. That's it.

Don't worry about rotation, it won't change.

Next time you build a 3 pot Wye/Delta bank, ask your crew members to indulge you. When ready to close in, ground the floater and close 2 cutouts only. Any two. Take a reading on the secondary. You'll see.

I did this once on a Wye/Delta bank that was served by underground. The pots were in an enclosure. Couldn't do it very fast because we had to open the enclosure, figure out the dead phase, disconnect it from the pot, shove the URD wire into the clear and then go back and close 2 dip fuses.

Did it on an overhead bank once when changing a blown arrester. Looked a little snakey so I did the aforemention method. No interuption.

[rcdallas]

Good job RC:) personally I think the question was a little beneath you! I got the feelling you've built a few open delta banks:cool:

I am waiting for you to start edumacating me on all the geeky delta stuff. Just got this book in that door said I should get...be prepared to be leaned on once some of this dust settles up in my head. :D

[rcdallas]

Remember R.C., there's no bad pots in this bank, only one dead phase coming into it. That's why it will work.

First thing is know which phase is dead. Amp tong might tell you.

2nd thing, open all three cutouts. (I used to think about that lighting pot last and first, but unless you're clumsy, don't worry about it)

3rd thing, ground the hi side "floater". Couple of hotclamps and # 6 cu.

4th thing, close the cutouts only on the "hot" phases. That's it.

Don't worry about rotation, it won't change.

Next time you build a 3 pot Wye/Delta bank, ask your crew members to indulge you. When ready to close in, ground the floater and close 2 cutouts only. Any two. Take a reading on the secondary. You'll see.

I did this once on a Wye/Delta bank that was served by underground. The pots were in an enclosure. Couldn't do it very fast because we had to open the enclosure, figure out the dead phase, disconnect it from the pot, shove the URD wire into the clear and then go back and close 2 dip fuses.

Did it on an overhead bank once when changing a blown arrester. Looked a little snakey so I did the aforemention method. No interuption.

You know what, I did miss grounding the wye.

I just drew this up from what you said, and from what I'm seeing it would work...the two other pots are back feeding the secondary, leaving the bottom side of the open cutout hot. I can see that working.

Son of a ***** that's brilliant.

[lineman2010]

Right down the road from the RV park I am currently staying in there is a 2 phase system with two cans on one pole. The secondary jumpers run from one can right into the second can. The primary is double dead ended at the pole also and the only thing I can think is that they are changing primary voltages with the two cans. I will have to go take some pictures of it before we are finished with the job. Only about two weeks to go on the job.

[Trbl639]

Right down the road from the RV park I am currently staying in there is a 2 phase system with two cans on one pole. The secondary jumpers run from one can right into the second can. The primary is double dead ended at the pole also and the only thing I can think is that they are changing primary voltages with the two cans. I will have to go take some pictures of it before we are finished with the job. Only about two weeks to go on the job.

Possible but from your explanation, I couldn't say....pictures would be helpful.........

Is there any secondary or service on the low side of the pots? Might just be an open/delta bank........in the south, there is a lot of 2 of 3 phase construction.cheaper than running 3 phase, if the load is not too high...

[lineman2010]

There is no secondary service on the pole. The two jumpers on the secondary side just sweep down from one pot and right up into the other pot. I will get a picture or two take of it tomorrow and post them.

[wtdoor67]

Hike up and look at the transformer labels. Or just ask the local hands.