Hi all,

I have a doubt regarding the class of power analyzer with its respective CT.

From my understanding, if we have a power meter with class0.5 for V&I and class1.0 for kW & kWh, in order to obtain class1.0 for kW & kWh, we must use a class 0.5 CT. kindly correct me.

However, i do see that there is power meter that comes with class 0.5 for V&I and class 0.5 for kW & kWh. If we use the same class0.5 CT , how do we get a class0.5 kW & kWh? Is it so that we need to use a class 0.2 CT in order to get a class 0.5 kW & kWh?

I have an enquiry saying that if we are using a direct meter(without CT) then class 1.0 for kW & kWh is acceptable. However, if we are using an indirect meter(with CT) then the minimum class must be 0.5 for kW & kWh. the reason behind this is that with direct meter there will be less error compared to those with CT. Is there such thing?

Pardon me for my ignorance as I have not much background in electrical engineering.

Thank you.