Ingeteam INGECON SUN EMS Manual De Configuración página 60

Configuration manual
Current transformers with a precision class that allows for current measurement with an error
below that established by precision class 0.5 are also accepted.
S : Precision power ( VA )
n
This setting describes the capacity of the transformer to make the current run around the
secondary through a load, maintaining the precision class. The power consumed in the current
transformer secondary must be calculated in VA (bear in mind the sum of wiring and the A65+
Wattmeter in this calculation).
The standardized power closest to that calculated should be selected. The standardized power
must be higher than that calculated.
The following ratio must be met for correct operations:
Ingeteam does not guarantee the precision and correct functioning of the strategy configured in
the EMS energy manager if this ratio is not met.
Isolation level
Current transformers providing an isolation level of ≥ 1 kV must be used.
Take into account the environmental operating conditions of the installation for
the settings defining the features of a current transformer.
The secondary circuit of an operational current transformer must never remain
open-circuited.
Application note:
S : Power consumed in the A65+ Wattmeter expressed in VA. The power dissipated by the
w
wattmeter for a nominal current I
For currents other than 5 A, the power consumed by the Wattmeter associated to the
measurement can be obtained as:
S : Power consumed by the wiring in the current transformer secondary in VA. This can be
c
calculated as:
The cable impedance is considered at an ambient temperature of less than 40 °C.
60
S ≥ S
n
(See application note)
= 5 A is S = 0.3 VA per phase.
n w
S = I 2 x Z , where Z = 0.3 VA / (5 A)2 = 12 mΩ
w w w
S = I
c
+ S
c w
2 x Z
c
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AAX2026IQM05_B.docx