Quantcast Appendix I Glossary - Cont'd -141200441
 

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SHIELD-- A nonconducting coating, paint, or sheet
THERMAL-MAGNETIC TRIP ELEMENT-- A
that is used to beneficially change the current on a
single circuit breaker trip element that combines the
cathode or anode; normally used with impressed
action of a thermal and a magnetic trip element.
current or other high-potential cathodic protection
THERMOCOUPLE METER MOVEMENT-- A
systems to distribute the current beyond the
meter movement that uses the current induced in a
immediate vicinity of the electrode.
thermocouple by the heating of a resistive element
to measure the current in a circuit; used to measure
SILICON CONTROLLED RECTIFIER PACK-
AGE-- A device that furnishes controlled dc power
ac or dc.
to a device.
THETA
The greek letter used to represent phase
SINE WAVE-- The curve traced by the projection on a
angle.
uniform time scale of the end of a rotating arm, or
THRESHOLD-- The least value of current or voltage
vector. Also known as a sinusoidal wave.
that produces the minimum detectable response.
SOLENOID-- An electromagnetic device that changes
TIME CONSTANT-- (1) The time required to charge
electrical energy into mechanical motion; based
a capacitor to 63.2 percent of maximum voltage or
upon the attraction of a movable iron plunger to the
discharge to 36.8 percent of its final voltage. (2) The
core of an electromagnet.
time required for the current in an inductor to
SOLID STATE-- A class of electronics components,
increase to 63.2 percent of maximum current of
such as transistors, diodes, integrated circuits,
decay to 36.8 percent of its final current.
silicon controlled rectifiers, and so forth.
TOLERANCE-- (1) The maximum error or variation
SPAN-- The distance between two points.
from the standard permissible in a measuring
instrument. (2) A maximum electrical or
SPECIAL FUNCTION-- A unique service performed
mechanical variation from specifications that can
by a system; usually above and beyond the direct
be tolerated without impairing the operation of a
design intent of the system.
device.
STANDARD PRINT-- A standard drawing,
TRACKING-- One object or device moving with or
schematic, or blueprint produced in the applicable
following another object or device.
technical manual or other official technical
publication.
T R A N S D U C E R -- A device that converts a
mechanical input signal into an electrical output
STATUS LOG-- A record of the instantaneous values
signal.
of important conditions having analog values.
TRANSFORMER-- A device composed of two or
STRAY-CURRENT CORROSION-- Corrosion
more coils, linked by magnetic lines of force, used
caused by current flow from a source (usually dc)
to transfer energy from one circuit to another.
through paths other than the intended circuit or by
extraneous currents in the electrolytic solution.
TRANSFORMER, STEP-DOWN-- A transformer
so constructed that the number of turns in the
SYSTEM-- The major functional section of an
secondary winding is less than the number of turns
installation.
in the primary winding. This construction will
SYSTEM INTERRELATION-- Specific individual
provide less voltage in the secondary circuit than in
operations in one system affecting the operation in
the primary circuit.
another system.
TRANSFORMER, STEP-UP-- A transformer so
TACHOMETER GENERATOR-- A device for
constructed that the number of turns in the
converting rotational speed into an electrical
secondary winding is more than the number of turns
quantity or signal,
in the primary winding. This construction will
provide more voltage in the secondary circuit than
TESLA-- The tesla is a measurement of magnetic flux,
in the primary circuit.
equivalent to 1 weber per square meter. One tesla is
equal to 10,000 gauss.
TRIP ELEMENT-- The part of a circuit breaker that
TEST POINT-- A position in a circuit where
senses any overload condition and causes the circuit
instruments can be inserted for test purposes.
breaker to open the circuit.

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