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 TM 55-1905-223-24-3
GLOSSARY - CONT
DEFINITIONS - CONT
EXCITER STATOR
The stationary member of the exciter which serves as the
exciter field producing the magnetic field from the direct
current supplied by the automatic voltage regulator.
FIELD
That part of the generator and exciter which, when supplied
with direct current, will produce a magnetic field. The exciter
serves as the generator field.
FREQUENCY
The number of complete cycles of alternating current per unit
of time. Typically, frequency is expressed in cycles per
second or Hertz (Hz).
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.
Glossary 4
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