Hello
I have a closet with two double doors. There’s a 3mm gap between the doors and a 10mm gap down the bottom. I have a few fans mounted above the doors in the wall.
Ambient air is always 2-3deg cooler than inside the closet due to some electrical equipment I have running in there.
I have 2...
I have a power network, two parallel generators which feed 2 parallel delta-wye transformers with a bus tie inbetween, from 690V to 33kV. These two transformers feed a bus which a whole bunch of 33kV/690V DELTA-WYE transformers hang off for distribution.
There was a fault the other day at the...
I am trying to purchase a starter for a very small single phase motor (.14kW). I have come across some schneider starters, but I am unsure what the difference is between these two...
Thanks for your reply. My question was however clarification on why they use phase voltage when they're calculating at the load end, total fault current that the transformer can deliver.
Hi,
I'm trying to perform a short circuit fault calculation on this transformer and load I have when a 3 phase bolted short (worse case) occurs.
The transformer specs are below:
Z(transformer)=5%, Z(cable)= .00306 + j.0027, Delta/Star 6.6kV/400V
I can understand calculating the short circuit...
I have a 45kW VSD drive with pf of .9 and FL amp of 75A, I have a 350m run from the MCC to the VSD itself and I'm trying to calculate what size cable I need so that I don't exceed the specified voltage drop of 3%. The line-line voltage where the motor is to be placed is 400V and the cable...