Generators!!

ohh sorry... i mean to say NOT CONNECTED IN DELTA?

Who says they aren't?

Perhaps because for a given load, the currents are higher in delta, and copper is expensive and heavy?

Whether connected delta or wye, the same amount of copper (in principle) is required for a given kVA rating. Insulation thickness and other factors may have a second order effect on how efficiently the copper can be used.

Bill

-- Fermez le Bush--about two years to go.

--------------------------------------- They aren't. Probably more are connected Y.

Capacitive impedances between conductor and ground are relatively high so ground faults in a delta machine can result in appreciable current at the fault point- chewing holes in the iron and the conductor but low enough not to be easily detected. If you do have a fault it is better to be able to detect it quickly and clear it quickly. In addition there is some actual cost advantage to a Y connection- particularly at higher voltages.

All in all, the choice is made on the basis of actual experience.

| On Mar 27, 11:30 pm, "Ali" wrote: |> Why the electrical generators are always connected in delta? | | ohh sorry... i mean to say NOT CONNECTED IN DELTA?

Why would they need to be? You could have the generator wired in Star/Wye and the load wired in Delta.