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 TM 55-1905-223-24-3
GLOSSARY - CONT
DEFINITIONS - CONT
ISOCHRONOUS
As it applies to engine governors, maintaining constant steady-
state speed regardless of the load within the ratingof 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.
An instrument for measuring electrical resistance.
PARALLEL OPERATION
The method by which two or more generators having the same
voltage and frequency characteristics are connected to a
common load.
PHASE
The windings or an ac generator into which a voltage is
induced. In a three-phase system, there are three sets of
windings, each set having a voltage alternating within it exactly
one-third of a cycle after the one ahead of it because of the
physical arrangement of the coils.
PITTING
Corrosion attack in localized areas, resulting in the formation
of tiny cavities.
POLARITY
An electrical term which indicates the direction in which current
flows in a conductor. In a direct current system, current
constantly flows in the same direction. In an alternating
current
system, current changes direction as the polarity of the ac
voltage source changes.
RECTIFIER
A device used to convert alternating current to direct current.
A
diode is one of several devices which act as rectifiers.
An electromechanical device having a magnetic coil which,
when energized, opens or closes several sets of contacts.
RESISTANCE
Opposition to the flow of current.
RESISTOR
A component which possesses resistance.
Glossary 5
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