Glossary 63230-3 00-212
April 2001
©200 1 Schneider Electric All Rights Reserved
194
K-factor—anumerical rating used to specify
powert ransformersfor non linear loads. It
describes a transformer’sability to serve
nonlinearloads without exceeding rated
temperaturerise limits.
KYZ output—pulse outputfrom a metering
devicewhere each pulse has a weight assigned
to it which representsan amount of energy or
other value.
LCD—liquid crystaldisplay.
line-to-line voltages—measurement of the rms
line-to-linevoltages of the circuit.
line-to-neutralvoltages—measurement of the
rms line-to-neutralvoltages of the circuit.
logging—recordingdata at user-defined
intervals inthe circuit monitor’s nonvolatile
memory.
maximum value—highestvalue recorded of the
instantaneousquantity such as Phase A Current,
Phase A Voltage,etc., since the last reset of the
minimums and maximums.
minimum value—lowestvalue recorded of the
instantaneousquantity such as Phase A Current,
Phase A Voltage,etc., since the last reset of the
minimums and maximums.
nominal—typical or average.
onboard—refersto data stored in the circuit
monitor.
option cards—optional,field-installable
accessoriesfor the circuitmonitor that expand the
I/O and Ethernet communicationscapabilities
because theycan be inserted into slots in the
circuit monitor.
overvoltage—increase in effective voltage to
greaterthan 110 percent for longer than one
minute.
parity—refersto binary numbers sent over the
communicationslink. An extra bitis added so that
thenumber of ones in the binary number is either
evenor odd, depending on your configuration).
Usedt o detecterrors in the transmission of data.
partial intervaldemand—calculation of energy
thus farin a present interval. Equal to energy
accumulatedthus far in the interval divided by the
length of thecomplete interval.
peakdemand current—highest demand current
measured in amperessince the last reset of
demand. See also
peak value
.
peakdemand real power—highest demand real
power measuredsince the last rest of demand.
peak demand volt age—highestdemand voltage
measuredsince the last reset of demand voltage.
See also
peak value
.
peak demand—highest demandmeasured
since the lastreset of peak demand.
peak value—of voltageor current is the
maximum or minimumcrest value of a waveform.
phase currents (rms)—measurementin
amperes of the rms current foreach of the three
phases of the circuit.See also
peak value
.
phase rotation—phase rotations refers to the
order in which theinstantaneous values of the
voltagesor currents of the system reach their
maximum positivevalues. Two phase rotations
are possible: A- B-C or A-C-B.
potential transformer(PT)—also known as a
voltagetransformer
powerf actor(PF)—true power factor is the ratio
of real powerto apparent power using the
complete harmonic contentof real and apparent
power.Calculated by dividing watts by volt
amperes. Powerfactor is the difference between
thetotal power your utility deliversand the portion
oftotal power that does useful work. Powerfactor
is the degree towhi ch voltageand current to a
load are out of phase.See also
displacementpower factor
.
predicteddemand—the circuit monitor takes
into account theenergy consumption thus far in
the present intervaland the present rate of
consumptionto predict demand power at the end
of the present interval.
quantity—a parameterthat the circuit monitor
can measure or calculatesuch as current,
voltage,power factor, etc.
real power—calculationof the real power
(3-phase total andper-phase real power
calculated)to obtain kilowatts.
recloser sequence—aseries of voltage sags
caused by a utilitybreaker opening a number of
consecutivetimes in an effort to clear a fault. See
also
sag
/
swell
.