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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$6 THE DISEASES OF
it has the same effect as a short-circuit between the
copper of the winding, which has already been con-
sidered above.
Two-Ph.ase Winding.—Two-phase armatures have
two independent windings, displaced one from another
by a half of the pole-pitch and connected together
at the neutral point. Three-phase alternators have
three windings, displaced by two-thirds of a pole-pitch.
While, practically, two-phase generators are always
connected, as above mentioned, in one point—the
neutral point—three phase-windings are connected in
two different ways.
Three Phase Star Conneetion.—Fig\ 27 repre-
sents the more usual star method of connection.
Here the three ends of the windings are united at the
neutral point. The voltage between 3 and 2 is equal
Fig. 27.
to the voltage between 2 and 3, and also between 1
and 3. This faet must be noticed as differing from