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Consider an ordinary residential 120/240V single phase service. You have _3_ wires that come from the transformer, and you supply your loads with various combinations of those three wires. One of those wires is the neutral, and it is _intentionally_ connected to ground, and is called the 'grounded conductor' or 'neutral'.
WHAT WOULD THE CALCULATIONS BE FOR LINE AND LOAD IF WE HAVE 240V 3-PHASE AND STEP-UP TO 480V IF THE 480V EQUIP. IS RATED FOR 3-PHASE 40 AMPS.I AM USING A 45KVA 3-PHASE TRANSFORMER 480-240V AND REVERSE THE CONNECTION.WHAT SIZE BREAKERS WOULD I NEED ON THE LINE AND LOAD SIDE.THANKS
Please see attached three phase transformer its primary is 480/277V and secondary is 240/120V i.e delta with 120V center tap. Spec sheet says primary connection Delta and secondary connection is delta w/center tap. In addition to attachment please see below link that has wiring diagram of...
You need to look at wiring diagrams for 240/120 3-phase 4-wire connections. This system often goes by several slang name, a popular ones are 'wild-leg' and 'high-leg'. Before we go off into the weeds: what loading will you require? How much 3-phase 240V?, How much single phase 240V, how much single phase 120V?
400 amp 3 phase 120/240 Volt Delta Service. 200 amp 3 PHASE HVAC fused disconnect fed through trough 200 amp single phase MDP The engineer has proposed replacing the MDP 200 amp single phase panel with a 400 AMP 3 PHASE MDP panel without changing the service. The total load for this building is not an issue.
Is it reasonable to run a 3-phase 3-wire circuit from the 208Y switchboard to feed a 208D transformer to connect to the 480Y/277V PV system. The neutral on the PV side isn't current carrying, and used primarily for monitoring. I'm hearing that the delta on the transformer may not sync with the 208Y of the switchboard. Please advise.
If you only need 120/240V single-phase, there is no reason to pay for and install the 3-phase transformer. Connect 480V 2-wire to a 480-120/240V single-phase transformer. Warning: a VFD will generate "50Hz" for a motor but it will be all chopped up and distorted, not a neat sine-wave.
The drawings indicate that I need a 30 amp 3 phase, 4 wire circuit with disconnect switch and thats all. The customer will supply the transformer. My question is do I need over current protection on the secondary side or will the 30 amp 3 phase breaker be sufficent for the primary and secondary of the transformer.
If it's 200A maximum load at 208V 3 phase, that's a 75kVA transformer (with near zero head room), but the only alternative would be a 112.5kVA and run it at <70% loading, which has some efficiency issues. Since it's unlikely that every charger will be at 100% load 100% of the time, I'd stick with 75kVA.
The utility company says it is an un-grounded delta secondary at 480V/3-phase/3-wire system. I asked them to take voltage readings between phase-phase and phase-ground just to make sure it is an un-grounded delta secondary. They sent me back readings for phase-phase at 480V, but phase-ground measured approximately 277V for each leg.