32 ELECTRIC DISCHARGES, WAVES AND IMPULSES,
If the current ii is zero, we get the starting of the alternating
current in an inductive circuit, as shown in Figs, 16, A, B, (>. The
starting transient is zero, if the circuit is closed at the moment
when the permanent current would he zero (Fig* 1GB), and is a
maximum when closing the circuit at the maximum point of the
permanent-current wave (Fig, 1(KV). The permanent current and
the transient components are shown dotted in Fig. 10, and the
resultant or actual current in drawn linen.
current in an inductive circuit, as shown in Figs, 16, A, B, (>. The
starting transient is zero, if the circuit is closed at the moment
when the permanent current would he zero (Fig* 1GB), and is a
maximum when closing the circuit at the maximum point of the
permanent-current wave (Fig, 1(KV). The permanent current and
the transient components are shown dotted in Fig. 10, and the
resultant or actual current in drawn linen.
Fig, 10. — Single-onorgy Starting TnwHiimt of Alt<Mrnatinj(*<nsmwt < Circuit.
18- Applying the preceding to the* starting of it huianml
three-phase system, we see, in Fig, 17A, that hi general the three
transients ii°, if, and ia° of the three thrw-phaw cmrnmtH /if i*f 4
are different, and thus also the shape of the three* rewiltant
currents during the transition period. Starting at the moment
of zero current of one phase, %, Fig. 17/1, then* in no tronniont for
this current, while the transients of the other two current*, 4
and is, are equal and opposite, and near their maximum value.
Starting, in Fig. 17C, at the maximum value of on* ournmt /a,
we have the maximum value of transient for thi» current 4°, white
the transients of the two other currents, % and i$» are equal, have
three-phase system, we see, in Fig, 17A, that hi general the three
transients ii°, if, and ia° of the three thrw-phaw cmrnmtH /if i*f 4
are different, and thus also the shape of the three* rewiltant
currents during the transition period. Starting at the moment
of zero current of one phase, %, Fig. 17/1, then* in no tronniont for
this current, while the transients of the other two current*, 4
and is, are equal and opposite, and near their maximum value.
Starting, in Fig. 17C, at the maximum value of on* ournmt /a,
we have the maximum value of transient for thi» current 4°, white
the transients of the two other currents, % and i$» are equal, have