I wanted to get your opinion of this situation.
We have an electric substation that was built in the late 1950's early 1960's. It is a steel structure with an exposed copper IPS bus on top. The voltage is 12,470 wye/7200.
Two years ago we had a lightning strike at the station. It damaged one...
This week we had an interesting situation here that still has some of us scratching our head. We have an industrial customer that is supplied by two parallelled pad mounted transformers. The primary voltage is 12,470/7200 GND-Y. the secondary is 480/277 GND-Y. Both transformers were installed...
I have been asked to consult on a new generator installation that is having startup problems. They have already fried two DC displays.
The system is installed at a primary metered facility that is fed 12470 from the utility. The feed has been re-routed to feed thru a 1500 kVA, 12470 GY to 480...
One of our customers has requested fault current data for the secondary side of their transformer bank. They have a Y-Delta, 240 volt, three phase, four wire service, with two 50 kVA and one 75 kVA, 7200 to 120/240 transformers. The center tap of the 75 kVA provides the load side neutral. My...
Is there a way to test distribution transformers for winding faults using a meter or a thumper(Hi-pot) device? Our linemen typically test for winding faults by inserting a smaller sized fuse, re-energizing the transformer, and waiting to see if the fuse will hold. The problem is, with our...
