ykee,
Actually, the transformer is at the output of the inverter and static switch. The inverter runs on a 540 volt battery plant. The bypass breaker bypasses the static switch from the 480 volt input bus around the inverter and static switch to feed the transformer directly. The transformer...
I have a pair of 21 year old 50 KVA UPSs that are going to be replaced with a pair of new 150 KVA units. The input is 480 3 phase, the output is 120/208 to a pair of 42 position panels (one panel per UPS, 2/0 cable 100 feet away. The load on each UPS is 16 KVA (UPS-1: A phase=48amps, B...
I am looking for a source in the USA for .25 inch wide toothed pulleys and toothed belts to drive a .25 inch shaft on a 10 turn potentiometer for position of a multi turn shaft. Rotation speed is less than .25 RPM.
Also looking for a belt that if cut and layed out flat would look like a...
OK, NOW we're seeing the big picture!!!!! Thanks Wirechief for the great screen shots of what I was trying to picture in my mind!!!! THIS IS PERFECT!!!!! I hope you don't mind, I will share this screenshot for anyone who wants to see it....
download and open the word document to see the...
rbulsara, thank you ..... that is what I was confused about!!! I was thinking of setting up a test with some 120/208 three phase, a couple of PTs and a scope and playing with it to get a clear picture in my mind of what is really going on in this kind of configuration...
Thank you one and all...
I should know this, but..... my home is on it's own transformer it's fed with two phases of a three phase 12 KV system. Since the high side of the transformer is fed with two phases 120 degrees out of phase, how does it make 120/240 single phase? the primary (high side) of the xformer...
Thanks, I work for the local Irrigation District (also electric power and domestic water provider for city of 200,000) but no one in the irrigation dept. really knows pumps, the ones that did retired is the last several months!!!!! Kind of a common thing going on around here!!! With the last...
From what I have learned about part wound motors in the past week plus my own experience with my old ag well pump, contactor number 1 should close (start windings) and pump should start to turn for 3 to 5 seconds then contactor number 2 should close and the motor will speed up to its running...
Good in electronics and telecom, new to BIG 3 phase motors!!
I have an ag well pump.... 100 Horsepower 480 3 phase "part wind" (6 wire) motor with a "starter" (just 2 big contactors really) one has a phnumatic time delay adjustable from 0 to 40 seconds(as found set to 0.1 seconds)unit is 12...
