
GL.6
SEL-734 Meter
Instruction Manual
Date Code 20090730
Glossary
Input Conditioning
—
Math Operators
Input Conditioning
The establishment of debounce time and assertion level.
Instantaneous Meter
Type of meter data presented by the SEL-734 that includes the present values
measured at the meter ac inputs. The word “Instantaneous” is used to
differentiate these values from the measurements presented by the demand,
energy, and other meter types.
IRIG-B
A time code input that the meter can use to set the internal meter clock.
Jitter
Time, amplitude, frequency, or phase-related abrupt, spurious variations in
duration, magnitude, or frequency.
K
e
or KYZ Output
Constant
A pulse constant for the KYZ outputs of a solid-state meter, programmable in
unit-hours per pulse.
K
h
or Watt-hour Constant
The number of watt-hours represented by one revolution of the disk in
electromechanical meters—also called the Disk Constant. For a solid-state
meter, K
h
is essentially meaningless since there is no disk. However, ANSI
C12.10 requires that K
h
be displayed on the faceplate.
K
t
or Test Constant
The number of watt-hours represented by one test pulse in a solid-state meter.
The test pulse is usually provided by an IR LED or a contact output.
K-factor
A measure of the effect of harmonic load currents used for derating equipment
(transformers), as described in ANSI/IEEE C57.110. The larger the K-factor
the greater the harmonic heating effects. A K-factor of 1.0 indicates a linear
load (no harmonics). K-factor is the summation of the square of a particular
harmonic current multiplied by the square of the harmonic number. K-factor
transformers have additional thermal capacity, design features that minimize
harmonic current losses, and oversized thermal connections.
KYZ Output
A three-wire (Form C contact) output from a metering device to drive external
control or recording equipment. Each pulse or transition represents a
predetermined increment of energy or other quantity.
L/R
Circuit inductive/resistive ratio.
Latch Bits
Nonvolatile storage locations for binary information.
LED
Light-emitting diode. Used as indicators on the meter front panel.
LMD
SEL Distributed Port Switch protocol.
Logical 0
A false logic condition, dropped out element, or deasserted control input or
control output.
Logical 1
A true logic condition, picked up element, or asserted control input or control
output.
Low-Level Test Interface
An interface that provides a means for interrupting the connection between the
meter input transformers and the input processing module and allows inserting
reduced-scale test quantities for meter testing.
Maintenance Testing
Testing that confirms that the meter is measuring ac quantities accurately and
verifies correct functioning of auxiliary equipment and scheme logic.
Math Operators
Operators that you use in the construction of math SEL
OGIC
control equations
to manipulate numerical values and provide a numerical base-10 result.
Содержание SEL-734
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