The Diseases Of Electrical Machinery
Forfatter: Ernst Schulz
År: 1904
Forlag: E. & F. N. SPON, Ltd.
Sted: London
Sider: 84
UDK: 621.311
Edited with a preface, by Silvanus P. Thompson
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74 THE DISEA SES OF
is 142 volts, the two single-phase transformers must
be built for 100 volts. With star-connected three-
phase transformers, with a voltage of 173 volts be-
tween lines, the separate transformers must be built
for 100 volts. If the line voltage is 1000 volts, each
of the star-connected transformers must be of 577
volts. If the transformers are connected in mesh, the
line voltage is equal to the voltage of a single trans-
Fig. 40.
former. In Figs. 30, 36 and 37, the various voltages
have been inserted.
Two-phase and three-phase transformers can, how-
ever, also be built by combining mechanically in one
system a corresponding number of single-phase trans-
formers. Numerous firms have built three-phase
transformers as in Fig. 38. These are three-leg core
transformers. The difference between them and the
single-phase shell-type (Fig. 33) is, that the section of
the three legs is the same, and that all the three are