
SEBU8219-01 141
Reference Information Section
Reference Materials
Interference –
Interference is an unwa nted mixture
of electrical signals. Interference is usually associated
with electrical noise.
Instrumentation – Instrumentation is a group of
instruments that are used for measuring a system
function.
Insulated – An insulated device is a device that is
covered with
a nonconductive material.
kVA – This is the abbreviation for Kilovolt Amperes.
kVA is a term t
hat is used when electrical devices
are rated. In order to calculate a device’s kVA rating,
multiply the rated output (amperes) by the rated
operating vo
ltage.
KVAR – Kilovolt Amperes Reactive is abbreviated as
KVAR. KVAR i
s associated with the reactive power
that flows in a power system. Reactive power does
not load the generator set’s engine. Reactive power
will cause
thermal loss in the generator.
KVAR Regulation – KVAR Regulation is one of the
two method
s that are used to regulate the reactive
power output. Regardless of the generator’s real
power output, the voltage regulator causes the
generator
to produce a constant value of KVAR. In
this case, the generator’s power factor will change
when the generator’s real power output changes.
KVAR regu
lation is used when the generator is
connected in parallel with an infinite bus (utility) and it
is not possible to change the system voltage.
Kilowatts (kW) – Kilowatt is the electrical rating of
the generator. One kilowatt equals 1000 watts. Actual
power is
measured in kilowatts.
Lead – Aleadisawire.
Line Voltage – Line voltage is the output voltage
of the generator that is measured between the
generat
or leads (phases).
Lock In – Lock in occurs when a contact closes in
order to
keep a device in an energized state.
Lock Out – Lockout occurs when a contact opens in
order to
keep a device in a de-energized state.
Magnetic – A magnetic device is a device that has
the cha
racteristics of a magnet.
Magnification – Magnification refers to the
enlarg
ement of an item.
Module – A module is an assembly of electronic
compon
ents and electronic circuits.
Moisture – Moisture is the presence of water.
Oscillation – O
scillation is the flow of electricity that
periodically changes direction and/or magnitude.
Permanent Mag
net (PM) – A permanent magnet
supplies the initial magnetism that is required to start
a PMPE generator.
Permanent magnet pilot excited (PMPE) – A
PMPE generator receives power for the voltage
regulator fr
om a pilot exciter. A PMPE generator
consists of a permanent magnet and a pilot exciter.
PF Regulatio
n–PF Regulation is one of the two
ways to regulate the reactive power output. PF
regulation is used when the generator is connected
in parallel w
ithaninfinite bus (utility) and it is not
possible to control the system voltage.
Phase Windi
ng – A phase winding is a group of
generator stator coils. Electric power for one phase
of the load is induced in the phase winding.
Polarity –
Polarity is the positive characteristics or
the negative characteristics of two poles.
Power Factor (PF) – Power factor is the ratio of
apparent power (kVA) to total power (kW). The power
factor rep
resents the portion of the current that is
doing useful work. Power factor is expressed as a
decimal number between 0 and 1.
Pulsating – Pulsating relates to the characteristics
of current that are similar to mechanical vibration.
Radio Suppression – Radio suppression reduces
the amplitude of radio frequency interference.
Reactive Droop Compensation – Reactive Droop
Compensation is one of the two methods that are
used for r
eactive power equalization. In reactive
droop compensation, the voltage regulator causes an
individual generator output to change in proportion
to the re
active current. This reactive current is
measured with a current transformer.
Reactiv
ePower –Reactive power flows back and
forth between the inductive windings of the generator.
These windings are part of the electrical load. The
reactiv
e power does not perform any useful work in
the electrical load. The reactive power only applies
load to the generator. This limits the generator’s
capaci
ty.
Reciprocating – Reciprocating motion is motion
that fir
st moves in a straight line in one direction. The
direction of this motion then varies by 180 degrees.
Rectifi
er – Arectifier is a diode circuit that converts
alternating current (AC) to direct current (DC).