Wiring diagrams of electrical apparatus and installations (1913)
McGraw-Hill · New York, McGraw-Hill Book Company · leaf 198
Fig. 302. Fig. 303. Fig. 302.—Two single-phase wattmeters connected to a two-phase circuit with instru-ment transformers. Fig. 303.—Two single-phase wattmeters connected to measure three-phase power. … .ZIX -^C^ Fig. 304. Fig. 305. Fig. 304.—Two single-phase wattmeters connected to a three-phase circuit with instru-ment transformers. Fig. 305.—Two single-phase wattmeters connected to a four-wire three-phase circuitusing series transformers. Series transformers are always used for this connection.…
Electric wiring
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