Ingeteam INGECON EMS Manager Manual De Instalacion Y Uso página 44

Ingeteam
The following ratio must be met for correct operations:
(See application note)
Ingeteam does not guarantee the precision and correct functioning of the strategy configured in the INGECON EMS
Manager if this ratio is not met.
Isolation level
Current transformers providing an isolation level of ≥ 1 kV must be used.
Bear the environmental operating conditions of the installation in mind in the parameters defining
the features of a current transformer.
The secondary circuit of an operational current transformer must never remain open-circuited.
Application note:
Sw: Power consumed in the A65+ Wattmeter expressed in VA. The power dissipated by the Wattmeter for a nominal
current In = 5 A is Sw = 0.3 VA per phase.
For currents other than 5 A, the power consumed by the Wattmeter associated to the measurement can be obtained
as:
Sc: Power consumed by the wiring in the current transformer secondary in VA. This can be calculated as:
The cable impedance is considered at an ambient temperature of less than 40 °C.
44
Sn ≥ Sc + Sw
Sw = I x Zw, where Zw = 0.3 VA / (5 A)
2
Sc = I
= 12 mΩ
2
x Zc
2
AAX2022IQM01_ - Installation and Operation Manual
Appendix 2: Current Transformer