Alternating-current machines by Sheldon Samuel

Author:Sheldon, Samuel
Language: eng
Format: epub
Publisher: New York, D. Van Nostrand
Published: 1908-03-25T05:00:00+00:00

Fig. 128.

THE TRANSFORMER.

183

cases are led to a porcelain block on which are four screw-connectors and a pair of brass links, allowing the coils to be arranged in series or in multiple according to the pressure of the line to which they are to be connected. From this block two wires run through suitably bushed holes outside the case.

A two-phase four-wire system can be considered as two independent single-phase systems, transformation being accomplished by putting similar single-phase transformers in the circuit, one on each phase. If it is desired to tap a two-phase circuit to supply a two-phase three-wire circuit, the arrangement of- Fig. 129 is employed. Fig- «g. By the reverse connections

two-phase three-wire can be transformed to two-phase four-wire. An interesting transformer connection is that devised by Scott, which permits of transformation from two-phase four-wire to three-phase three-wire. Fig. 130 shows the connections of the two transformers. If one

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