
140 SEBU8219-01
Reference Information Section
Reference Materials
Circulating Cu
rrent – Circulating current is the flow
of current between two or more generators that are
working in parallel. Circulating current is also the flow
of current bet
ween two or more generators that are
parallel with a utility line.
Conduct – Con
ducting relates to allowing the flow of
current.
Constant Vol
tage Regulation – Constant Voltage
Regulation is one of the two methods of voltage
regulation. In order to maintain the line voltage,
Constant vol
tage regulators allow the field to be
forced to the saturation point. This allows the engine
to be overloaded. On large block load applications,
theenginem
ay not recover.
Continuity – Continuity provides a path for current
flow.
Control – A control is a device that controls another
device. A c
ontrol is also a circuit that controls a
device.
Cross Curr
ent Compensation – Cross current
compensation is a method that is used for reactive
power equalization.
Current Transformer (CT) – A current transformer
is used to step down higher line current.
Direct Current (DC) – Direct current is current flow
that moves in only one direction in a given circuit.
Damping – Damping refers to decreasing the
amplitude of a signal.
De-energized – A de-energized input refers to
stopping the current that is going to a component.
Distribution Winding – Distribution windings go
from one end of the core to the other end of the
core. The
se windings are arranged in groups that are
located in several slots.
Droop – Dr
oop refers to a decrease.
Excitation – Excitation is controlled direct current
(DC) that
is used to make a magnetic field.
Energized – An energized input refers to activating
adevice
.
Electrostatic Charge – Electrostatic charge is
electri
city that is caused by induced voltage and
stored charge.
Exciter
– An exciter supplies direct current (DC) to
the field windings of the generator.
Field – A field is
a magnetic line of force that
surrounds a conductor. This force is caused by
current flow in the conductor.
Field Windings – Field windings are many turns of
wire that are wrapped around an iron core. When
direct curre
nt (DC) flows through the field windings,
a magnetic field is produced. This magnetic
field is
comparable to the magnetic field of a bar magnet.
Flashing – Flashing is a process of putting direct
current from an external source into the field
windings. Th
is process causes the generator to
produce an output voltage.
Flux – Flux is
magnetic lines of force.
Frequency – Frequency is the number of cycles
that are com
pleted in a one second period. The unit
of frequency is the Hertz (Hz). One hertz is equal to
one cycle per second.
Full-Wave Rectifier – Afull-waverectifier changes
the positive phase and the negative phase of
alternati
ng current to direct current.
Gain – Gain relates to the ratio of input magnitude to
output mag
nitude.
Gate – A gate is an electronic part of a controlled
rectifier (
thyristor).
Generate – The production of electricity.
Grounded – A device is grounded by making
a connection to ground. A device could also be
grounded
by making a connection to a component
that is connected to ground.
Hertz (Hz
)–Hertz is the unit of measurement for
frequency. One hertz is equal to one cycle per
second.
Humidity – Humidity is the water content that is
present in the air.
Impedance – Impedance is the resistance to
alternating current.
Impulse Modulation – Impulse modulation changes
the following characteristics of a wave: amplitude,
frequen
cy, and phase. This is accomplished by
impressing one wave on another wave that has
constant properties.
Induce – This refers to the transfer of power from
one device to another device. The transfer is done
via a mag
netic field or via an electric field.