
142 SEBU8219-01
Reference Information Section
Reference Materials
Regenerative P
ower – Regenerative power works
against primary power.
Reset – A reset
returns a switch to a ready condition.
In addition, a reset returns a circuit to a ready
condition.
Residual Magnetism – Residual magnetism is a
small amount of magnetism that is remaining in a
device after
excitation is removed.
RFA – An RFA is a rotating field assembly.
Rotating Rectifier – A rotating rectifier is mounted
to a plate on a generator shaft. This plate then rotates
with the gene
rator shaft.
Rotor – A rotor is the rotating windings of a
generator.
Saturable Reactor – A saturable reactor has
characteri
stics that are similar to a valve. As the load
change s, a valve opens in order to give more current
totheoutputoravalveclosesinordertogiveless
current to t
he output.
Saturated – A device has been saturated when
thedeviceh
as been magnetized in excess. When
saturation occurs, a large increase in current results
in a small increase in magnetic force.
SCR – An SCR is a silicon controlled rectifier. An
SCR is a semiconductor.
SE – An SE generator is a self-excited generator.
An SE generator uses a small part of the generator
output to
provide excitation current back to the
generator. An SE generator uses residual magnetic
field for start-up.
Semiconductor – A semiconductor is a component
such as one of the following components: a
transist
or, a diode, and a thyristor. Semiconductors
have electrical characteristics that are between a
conductor and insulation.
Series Boost – A series boost is an attachment that
allows generator output to continue for a short time
during a
line failure. This allows the circuit breaker
to trip in sequence.
Short – A
short is an undesired electrical connection
that exists between two or more components.
Shutdow
n–A shutdown occurs when the engine is
stopped. This shutdown can occur manually or this
shutdown can occur automatically.
Simultaneous – A simultaneous occurrence refers
to two actions that happen at the same time.
Solid-State – A
solid-state component is an
electrical component that has no moving parts.
Stator – Astat
or is the windings of a generator that
do not rotate.
Surge – A surge
is a sudden increase in voltage or
current.
Tap – Atapisac
onnection at the midpoint of a
circuit. From this tap, power is taken from the circuit.
Transfer – At
ransfer refers to moving something
from one point to another point. A transfer also refers
to converting something from one state to another
state.
Transient Peak Voltage – A transient peak voltage
is a high volt
age condition of limited duration.
Turn-on – When a device is turned on, the device is
activated o
r the device is started.
Varistor – A varistor is a device that loses resistance
as voltage i
ncreases.
Voltage Droop Resistor – A voltage droop resistor
is a variabl
e resistor. This resistor is used to control
the change of voltage. This can occur when a
generator is paralleled with another generator. This
canalsooc
cur when the generator is paralleled with
a utility.
Voltage Le
vel Rheostat – A voltage level rheostat
gives a range of control that is used when the voltage
output level is adjusted.
Voltage Regulator – A voltage regulator is a circuit
that senses the generator’s output voltage. The field
coil curr
ent is automatically adjusted in order to
maintain the desired output.
Voltage S
pike – A voltage spike is a brief high
voltage.
Volts per
Hertz Regulation – Under block loading
conditions, the Volts per Hertz Regulation provides
fast recovery. This regulation maintains close voltage
control o
ver the normal load range. This regulation
also produces a rapid response of the generator set.
This control is maintained by matching the generator
output t
o the engine performance.
Windings – Windings are layers of wire on a core.
Wiring – Wiring relates to the wires of a circuit.
Wound – W
ound refers to being circled.