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Glossary 63230-300-212
April 2001
© 2001 Schneider Electric All Rights Reserved
194
K-factor—a numerical rating used to specify
power transformers for non linear loads. It
describes a transformer’s ability to serve
nonlinear loads without exceeding rated
temperature rise limits.
KYZ output—pulse output from a metering
device where each pulse has a weight assigned
to it which represents an amount of energy or
other value.
LCD—liquid crystal display.
line-to-line voltages—measurement of the rms
line-to-line voltages of the circuit.
line-to-neutral voltages—measurement of the
rms line-to-neutral voltages of the circuit.
logging—recording data at user-defined
intervals in the circuit monitor’s nonvolatile
memory.
maximum value—highest value recorded of the
instantaneous quantity such as Phase A Current,
Phase A Voltage, etc., since the last reset of the
minimums and maximums.
minimum value—lowest value recorded of the
instantaneous quantity such as Phase A Current,
Phase A Voltage, etc., since the last reset of the
minimums and maximums.
nominal—typical or average.
onboard—refers to data stored in the circuit
monitor.
option cards—optional, field-installable
accessories for thecircuit monitor that expand the
I/O and Ethernet communications capabilities
because they can be inserted into slots in the
circuit monitor.
overvoltage—increase in effective voltage to
greater than 110 percent for longer than one
minute.
parity—refers to binary numbers sent over the
communications link. An extra bit is added so that
the number of ones in the binary number is either
even or odd, depending on your configuration).
Used to detect errors in the transmission of data.
partial interval demand—calculation of energy
thus far in a present interval. Equal to energy
accumulated thus far in the interval divided by the
length of the complete interval.
peak demand current—highest demand current
measured in amperes since the last reset of
demand. See also
peak value
.
peak demand real power—highest demand real
power measured since the last rest of demand.
peak demand voltage—highest demand voltage
measured since the last reset of demand voltage.
See also
peak value
.
peak demand—highest demand measured
since the last reset of peak demand.
peak value—of voltage or current is the
maximum or minimum crest value of a waveform.
phase currents (rms)—measurement in
amperes of the rms current for each of the three
phases of the circuit. See also
peak value
.
phase rotation—phase rotations refers to the
order in which the instantaneous values of the
voltages or currents of the system reach their
maximum positive values. Two phase rotations
are possible: A-B-C or A-C-B.
potential transformer (PT)—also known as a
voltage transformer
power factor (PF)—true power factor is the ratio
of real power to apparent power using the
complete harmonic content of real and apparent
power. Calculated by dividing watts by volt
amperes. Power factor is the difference between
the total power your utility delivers and the portion
of total power that does useful work. Power factor
is the degree to which voltage and current to a
load are out of phase. See also
displacement
power factor
.
predicted demand—the circuit monitor takes
into account the energy consumption thus far in
the present interval and the present rate of
consumption to predict demand power at the end
of the present interval.
quantity—a parameter that the circuit monitor
can measure or calculate such as current,
voltage, power factor, etc.
real power—calculation of the real power
(3-phase total and per-phase real power
calculated) to obtain kilowatts.
recloser sequence—a series of voltage sags
caused by a utility breaker opening a number of
consecutive times in an effort to clear a fault. See
also
sag
/
swell
.