[Electric engineering.] . § 14 ELECTRIC TRANSMISSION. 67 however, be connected in series as shown at (b), when theprimaries are connected to different phases, forming a kindof three-wire system. The voltage obtained between theoutside wires will not be twice that of one transformer, asin the regular three-wire system. If the voltage of eachsecondary is E, the voltage between the two outside wireswill be E X For example, if each secondary gave100 volts, the pressure between the outside wires would : volts. This is because the E. M. in the two coilsare not in phase. This method
[Electric engineering.] . § 14 ELECTRIC TRANSMISSION. 67 however, be connected in series as shown at (b), when theprimaries are connected to different phases, forming a kindof three-wire system. The voltage obtained between theoutside wires will not be twice that of one transformer, asin the regular three-wire system. If the voltage of eachsecondary is E, the voltage between the two outside wireswill be E X For example, if each secondary gave100 volts, the pressure between the outside wires would : volts. This is because the E. M. in the two coilsare not in phase. This method of connecting up trans-formers is, however, not to be recommended, as the volt-ages on the two sides of the three-wire system are apt tobecome unbalanced. If a three-wire system is desired, it isbest to use the connections shown at (c), where both pri-maries are connected to the same phase. The E. M. inthe two secondary coils are in this case in phase with eachother and the pressure across the outside wires is twice
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