NATURE AND ORIGIN OF TRANSIENTS. 3
in generator, line, and load does not represent the entire phenome-
non. While electric power flows over the line A, there is a magnetic
field surrounding the line conductors, and an electrostatic field
issuing from the line conductors. The magnetic field and the
electrostatic or "dielectric " field represent stored energy. Thus,
during the permanent conditions of the flow of power through the
circuit Fig. 3, there is electric energy stored in the space surround-
ing the line conductors. There is energy stored also in the genera-
tor and in the load; for instance, the mechanical momentum of the
revolving fan in Fig. 1, and the heat energy of the incandescent
lamp filaments. The permanent condition of the circuit Fig, 3
thus represents not only flow of power, but also storage of energy.
When the switch ft 5s open, and no power Hows, no energy is
stored in the system* If we now close the switch, before the
permanent condition corresponding to the closed switch can occur,
non. While electric power flows over the line A, there is a magnetic
field surrounding the line conductors, and an electrostatic field
issuing from the line conductors. The magnetic field and the
electrostatic or "dielectric " field represent stored energy. Thus,
during the permanent conditions of the flow of power through the
circuit Fig. 3, there is electric energy stored in the space surround-
ing the line conductors. There is energy stored also in the genera-
tor and in the load; for instance, the mechanical momentum of the
revolving fan in Fig. 1, and the heat energy of the incandescent
lamp filaments. The permanent condition of the circuit Fig, 3
thus represents not only flow of power, but also storage of energy.
When the switch ft 5s open, and no power Hows, no energy is
stored in the system* If we now close the switch, before the
permanent condition corresponding to the closed switch can occur,
Fig. 3,
the stored energy has to be supplied from the source of power; that
w» for a short time power, in supplying the stored energy, flows not-
only through the circuit, but also from the circuit into the space
surrounding tin* conductors, etc. This flow of power, which sup-
plier the energy stored in the permanent condition of the circuit,
munt eoMo as soon as the stored energy has been supplied, and
than in a transient.
w» for a short time power, in supplying the stored energy, flows not-
only through the circuit, but also from the circuit into the space
surrounding tin* conductors, etc. This flow of power, which sup-
plier the energy stored in the permanent condition of the circuit,
munt eoMo as soon as the stored energy has been supplied, and
than in a transient.
Inversely, if wo disconnect some of the load L in Fig. 3, and
thereby reduce the* flow of power, a smaller amount of stored
energy would correspond to that lesser flow, and before the
condition** of the circuit can become stationary, or permanent
(corrtwpondinp; to the lessened flow of power), some of the stored
energy him to bo returned to the circuit, or dissipated, by a
thereby reduce the* flow of power, a smaller amount of stored
energy would correspond to that lesser flow, and before the
condition** of the circuit can become stationary, or permanent
(corrtwpondinp; to the lessened flow of power), some of the stored
energy him to bo returned to the circuit, or dissipated, by a
Than the tranwent is the result of the change of the amount of
stored energy^ required by the change of circuit conditions* .and