Table 13 (Cont.): Variables that can be included in the .STD le.
Variables Units
Tariff
T1-T2-T3
Total Tariff
No. of hours of the active tariff
hours
Cost
COST
CO
2
Emissions
kgCO
2
Some of the variables in the �STD le require an explanation:
PST Flicker:
The device records the value obtained during the logging period (PST Flicker). The PLT value
will be calculated by the device.
Harmonics:
CVM-A measures and records the average individual harmonic distortion rate (up to the 63th
harmonic) and the voltage and current THD value (up to the 40th harmonic).Each log corre-
sponds to a block of 10 cycles, within the recording period.
Unbalance:
The device calculates the asymmetry and unbalance coefcients of the voltages and currents
of the three-phase system.
Asymmetry coefcient, Ka: Homopolar component to direct component ratio in an unbal-
anced system.
% =
|
|
|
|
100
=
1 +
1 +
=
|
|
100
Ecuación 1: Asymmetry coefcient.
Unbalance coefcient, Kd: Reverse component to direct component ratio of an unbalanced
system.
% =
|
|
|
|
100
% =
|
|
|
|
100
=
1 +
1 +
=
|
|
100
Ecuación 2:Unbalance coefcient.
K-factor, Transformer power reduction factor:
The device calculates the K-factor according to the IEEE C57�110. The K-factor is a factor
that is used to calculate transformer power reduction.
=
=
1
Ecuación 3: K-factor
Where:
46
CVM-A1000 - CVM-A1500
Instruction Manual
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