Table 13 (Cont.): Variables that can be included in the .STD file.
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
file 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 coefficients of the voltages and currents
of the three-phase system.
Asymmetry coefficient, Ka:
Homopolar component to direct component ratio in an unbal-
anced system.
𝐾𝐾
𝑎𝑎
% =
|
𝑈𝑈
0
|
|
𝑈𝑈
𝑑𝑑
| 100
𝐾𝐾
𝑑𝑑
% =
|
𝑈𝑈
𝑖𝑖
|
|
𝑈𝑈
𝑑𝑑
| 100
𝐾𝐾
𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶
=
�
1 +
𝑒𝑒
1 +
𝑒𝑒 �
𝐼𝐼
1
𝐼𝐼
𝑒𝑒𝑒𝑒
�
2
� 𝑛𝑛
𝑞𝑞
�
𝐼𝐼
𝑛𝑛
𝐼𝐼
1
�
2
40
𝑛𝑛=2
𝐶𝐶𝐶𝐶
=
�𝑈𝑈
𝑝𝑝𝑖𝑖𝑝𝑝𝑝𝑝
�
|
𝑈𝑈
𝑅𝑅𝑅𝑅𝑅𝑅
| 100
Ecuación 1:
Asymmetry coefficient.
Unbalance coefficient, Kd:
Reverse component to direct component ratio of an unbalanced
system.
𝐾𝐾
𝑎𝑎
% =
|
𝑈𝑈
0
|
|
𝑈𝑈
𝑑𝑑
| 100
𝐾𝐾
𝑑𝑑
% =
|
𝑈𝑈
𝑖𝑖
|
|
𝑈𝑈
𝑑𝑑
| 100
𝐾𝐾
𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶
=
�
1 +
𝑒𝑒
1 +
𝑒𝑒 �
𝐼𝐼
1
𝐼𝐼
𝑒𝑒𝑒𝑒
�
2
� 𝑛𝑛
𝑞𝑞
�
𝐼𝐼
𝑛𝑛
𝐼𝐼
1
�
2
40
𝑛𝑛=2
𝐶𝐶𝐶𝐶
=
�𝑈𝑈
𝑝𝑝𝑖𝑖𝑝𝑝𝑝𝑝
�
|
𝑈𝑈
𝑅𝑅𝑅𝑅𝑅𝑅
| 100
Ecuación 2:
Unbalance coefficient.
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.
𝐾𝐾𝐾𝐾 − 𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓
=
� �
𝐼𝐼𝐼𝐼
ℎ
𝐼𝐼𝐼𝐼
𝑅𝑅𝑅𝑅
�
2
ℎ
2
∞
ℎ
=1
=
1
𝐼𝐼𝐼𝐼
𝑅𝑅𝑅𝑅
2
� 𝐼𝐼𝐼𝐼
ℎ
2
∞
ℎ=1
ℎ
2
Ecuación 3: K-factor
Where:
46
CVM-A1000 - CVM-A1500
Instruction Manual
Содержание CVM-A1000
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