238 



ELECTRICAL ENGINEERING 



the e.m.f. between lines A and B is 



BAB = e!-e 2 = V3 E Q sin (6 + 30) , effective value E AB 



the e.m.f. between lines B and C is 



e BC =e 2 -e3 = V3Eo sin (0-90), effective value E B c 



the e.m.f. between lines C and A is 



g CA = e 3 d = V% E Q sin (0 210), effective value EGA 



FIG. 206. 



the current in line A is 



IA = ii = IQ sin (0 $), effective value /A = 7^ = //; 



V2 



the current in line B is 



/ 



tj8 = 4 =/o sin (6 120), effective value IB = p- = Ii', 



V2 

 the current in line C is 



i c = i 3 = I sin (S - - 240), effective value 7 C = -y=. = /^. 



The effective values of these quantities are all shown in the vector 

 diagram in Fig. 206. 



