Power is the same regardless of delta or Wye.
From the end user view the main difference is having one wild leg that is only a 220v power feed and a neutral at the center of one winding for 110v from it to the other 2 legs. Yes you have three phase power but the loading is very unbalanced whereas a wye will give 220 across each of the 3 legs and/or 110v from any leg to the center-point neutral.
Assuming a balance load 3-phase equation is V*average current of the 3 legs (or just pick the highest current one)*1.73= Watts
ref https://en.wikipedia.org/wiki/Three-phase_electric_power
Topic: Delta vs WYE 3 Phase Electrical Service - page 2. (Read 1726 times)
I've got a question regarding Delta vs WYE 3 Phase service.
If I understand WYE correctly with 200amp 120/208 service, that would give me 208V x 200A x 1.732 = ~72kW available power. Each hot leg would be 120V x 200A = 24kW x3 legs = 72kW.
Can someone tell me how that equation works out for Delta service? I have 240 volts between each of the phases, 120 volts to ground on 2 legs, and 208 volts to ground on 1 leg. Is the equation 120V x 200A x 2 + 208V x 200A? That equals 48kW + 41.6kW = 89.6kW when adding the phases separately? How does that translate to 3 phases when trying to calculate total kW?
Unfortunately the building where I'm at has Delta 3 Phase so I'm trying to understand how much power is available with that service.
I appreciate any feedback and/or corrections of my calculations.
If I understand WYE correctly with 200amp 120/208 service, that would give me 208V x 200A x 1.732 = ~72kW available power. Each hot leg would be 120V x 200A = 24kW x3 legs = 72kW.
Can someone tell me how that equation works out for Delta service? I have 240 volts between each of the phases, 120 volts to ground on 2 legs, and 208 volts to ground on 1 leg. Is the equation 120V x 200A x 2 + 208V x 200A? That equals 48kW + 41.6kW = 89.6kW when adding the phases separately? How does that translate to 3 phases when trying to calculate total kW?
Unfortunately the building where I'm at has Delta 3 Phase so I'm trying to understand how much power is available with that service.
I appreciate any feedback and/or corrections of my calculations.
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