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SMART DLM
For currents other than 5 A, the power consumed by the wattmeters associated with the
measurements can be obtained as:
S
= I
2
x Z
w
w
S
: The power consumed by the current transformer secondary wiring in VA. It can be calculated as:
c
The cable impedance must be considered at an ambient temperature of at least 40ºC.
Insulation level
The current transformers used must provide an insulation level of ≥ 1 kV.
When setting the parameters to define the characteristics of a current transformer, consider the
environmental operating conditions of the installation.
The secondary circuit of a current transformer in service, must never be open-circuited
ABW2012IQM01_E.docx
, where Z
= 12 mΩ. For example: S
w
S
= I
2
c
= I
2
x Z
= 5
2
x 0.012 = 0.3VA
w
w
x Z
c
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