Looking forward to input!
In summer 2008 we commissioned a 20/27/33 MVA, 115-25 kV, Delta-Wye substation transformer. Subsequently we have had 3 differential trip events on the unit and have yet to determine the cause. Except for thes ethree events the transformer has otherwise been in...
I am looking into the purchase of sag tension software. To date seems the options are:
SAG10
ETAP
PLS-CADD
Appears that Sag10 might be the best option. The full PLS-CADD version is a bit pricey, so I would like to get responses from folks who have experience with either of these or all...
Have any of you experienced copper corrosion as a result of sewer gases? I have been made aware of a lift station installation that is about 1 to 2 months old that has had several (as in 5 or more) pump breakers "burn up" as I am told. One of the breakers was off and flashed over to ground...
In reviewing the standard I notice that the Isc used for the calcs appears to be infinite source. For those of you that have done the TDD calcs, do you use the infinite source or use the actual when it is available?
Just wondering what the intent of the standard is in this regard.
Thanks
Alan
I have been getting info from a customer as follows. They have a unit that is supposed to draw 17 to 18 amps at single phase 480 volts. The facility is served 4 wire 480/277 Y 2500 amp service. Service voltage is about 490 and 480+ at the unit. The current measurement on each of the lines...
For the Utility Guys Here:
I have an issue where a fairly large (480 volt, 1200 kW) customer feels they have voltage regulation issues. PF averages 75 to 80%. The customer is served from 2 miles of 336 Al. OH line at 25 kV and a 2500 kVA padmount tx. We have recorded the voltage on 2...
I have a friend that works for a Co-op and is looking for someone to train/certify one of their crews for 115 kV bare hand bucket work. He says the truck has already been certified. The location is in North Carolina. Anybody have a contact or source. I have searched the internet with no...
