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 TM 55-1905-223-24-5
GLOSSARY - CONT
GENERATOR ROTOR
-
The rotating member of the generator.
GENERATOR STATOR
-
The stationary member of the main generator which supplies the
three-phase output power to the load.
GLYCOLS
-
A group of chemicals used to lower the freezing point of water.
GOVERNOR
-
A device which controls engine speed and thus the generator output
frequency.
GROUND
-
A connection, either accidental or intentional, between an electrical
potential and the earth or some conducting body serving in place of the
earth.
HEAT SINK
-
A device which absorbs heat from electrical devices such as diodes
and SCRs and dissipates the heat to the surrounding air.
HERTZ
-
A term equivalent to cycles per second (see frequency).
HUNTING
-
Oscillation in frequency or in voltage where steady-state conditions
are not reached, particularly after a load transient change.
INSULATION
-
A non-conductive material such as rubber or plastic intended to
prevent current from flowing. Technically, insulation is any material
which resists the flow of current.
INSULATION RESISTANCE
-
A measure of the ability of insulation to prevent current from flowing. A
megohmmeter is used to measure the resistance in millions of ohms
between the windings and metal frame of a generator to determine the
insulation resistance of the windings.
ISOCHRONOUS
-
As it applies to engine governors, maintaining constant steady-state
speed regardless of the load within the rating of the engine. Thus, a
generator set is said to be isochronous if the frequency remains the
same regardless of load.
LINE-TO-LINE-VOLTAGE
-
The voltage between any two phases of a multi-phase system.
-
A high range high voltage ohmmeter. By measuring the current flow
caused by the applied voltage, insulation resistance can be
determined.
OHM
-
The unit of measure of electrical resistance. One ohm of resistance
will allow a current of one ampere to flow with an applied potential of
one volt.
Glossary 4
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