Just got a quote two months ago for a 25MVA. A little over a million and a quarter, with a 130 week lead time.
Our last one was ~$650k+, but that was pre covid
We only use pole ground mouldings on poles in certain areas of our system that is more prone to copper theft. Its like putting a lock on something, a dishonest man that steals will cut the lock. In our case, remove the moulding.
Copper clad steel is a better deterrent. Harder to cut and has no...
Three phase line. We have a fuse on A phase which feeds all customers where the line splits to the east to residences.
a 70V4E on the B phase tap that goes about two miles before it has the first customer where it drops to single phase and feeds quite a few customers.
We have a 35V4E on the C...
The second picture is taken from about 40’ away. Could be the distribution is just above the camera view…
Theres also a distribution line in the picture running parallel with the transmission.
Have to agree with David here. In the first picture, is that a distribution line perpendicular and under the transmission line?
I would want something to short out before transmission lines fell on distribution lines.
@energyfit….
I wasnt trying to be hateful, just letting you know another position.
I work for a utility and we do NOTHING for anyone backfeeding to our facilities for free. We charge for everything they need or require. Its pretty much standard practice across utilities
Just a thought here..
You’re running this generator to backfeed to the utility and get paid for your production?
What incentive does the utility have to correct an issue that affects only you?
Offer to pay for the balancing and see if they are willing to do it then.
Couple of things..
A 13.2 xf on a 13.8 system (or vice versa) would produce voltages at 230V or 250V. Not 270 or 280
Maybe a 13.2 Xf on a 14.4 system? That would make the voltages that high, but it wouldnt have went high all the sudden. It would have been high at installation and should have...
You guys install this bushing?
Is there a lot of paint on the mounting flange of the transformer?
As others have said, check your method and make sure your grounded.
Most winding temperature gauges are out of calibration. I wouldn't trust it as there are too many variables at play. Tap position, loading, calibration, etc…
When is the last time the oil temp guage has been tested and calibrated?
There really isn’t a way that i know of to test or calibrate a...
Understand also you can inadvertently change the vector group by wiring the generator outputs to the secondary side of the step up transformer simply by connecting it with the wrong rotation.
so connecting it ABC X1,X2,X3 will be YNd11, connecting it ACB X1, X2, X3 will result in YNd1
They should all be interconnected.
Connect the pole ground with the neutral wire on the pole, and run a tail from the mainline neutral through the neutral bushing in the transformer.
That sounds good, but then how do you protect the miles of line with insulators at each pole?
You make transformers bulletproof, then they start shooting interrupters, bushings, regulators, reclosers, breakers.. the list goes on and on.
Question is.. how high you want your energy costs for...
There was another attack on a North Carolina power distribution station three weeks prior to this latest incident: Another North Carolina power substation was disabled before the Moore County attack https://www.newsobserver.com/news/local/article269...]
Yes. But that area had an extensive...
We recently retired a station transformer. It was 1943 model.
Breaker and regulator changes, with good maintenance on switchgear, motor operators, and interrupters should last well beyond 30 years.
What types of pollutants are in the area?
“Very humid” conditions only shouldn’t blow fuses.
They don’t blow when it rains I’m assuming? The rain washes the pollutants away.
