Wiring diagrams of electrical apparatus and installations (1913)
McGraw-Hill · New York, McGraw-Hill Book Company · leaf 60
-200 V- •==• Ground Fig. 78.—Auto-transformer used as a balance coil for deriving of five-wire sjstem from a. two-wire system. 46 WIRING DIAGRAMS OF ELECTRICAL APPARATUS Ai- Bi- A2- B2- > > ummmmmm Kloo v^i-ioo V* -200 V- imm^mwMwm Ground -100 V^ -100 V» -200 V- FiG. 79.—Two five-tap… … Fig. 80.—Step-by-step potential regulat-ing transformer. By throwing the switchat the bottom, the transformer can be madeto boost or lower the line voltage. See Figs.74 and 75.
Electric wiring
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