Question

If one line conductor of a three phase line is cut the load is then supplied by?

Answer 1

In a balanced three-phase system, the conductors need be only about 75% the size of conductors for a single-phase two-wire system of the same KVA rating. This helps offset the cost of supplying the third conductor required by three-phase systems.

If a magnetic field is rotate through the conductors of a stationary coil then a single phase alternating voltage can be produced. 

Answer 2

Answer:

it will behave just like the 1-phase supply only.

Basically saying that the 3 phase supply will replicate the 1 phase supply 3 times is a false taken.

the 1 phase supply is between 1 line- & Neutral.

the 3 phase supply we obtain is not like measured between 3 lines-Neutral (like (R-N = 220) + (Y-N = 220) + (B-N = 220) = 660 IS WRONG).

Rather the supply we get in 3 phase is measured between either of the two Lines wise ( R-Y or Y-B or B-R) & at a time one isn't in action.

So calculating the voltage between 2 lines is like adding the two voltage source, but the point to make note is they all are 120 phase shifeted to each other (i.e. either lead or lag by 120 degrees in a Sine wave corrsp. to them).

Now if you connect any two of the 3 lines it will behave just like the 1-phase supply only. It will Run to give you o/p but with loaded configuration & will go on heating the windings finally burning your appliance to fumes.