Can three ammeters be connected in series on the secondary side of a current transformer?
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Can three ammeters be connected in series on the secondary side of a current transformer? Three ammeters are installed respectively on the distribution cabinet panel, the on-site operation column, and the control panel in the control room. In this situation, for the secondary side of the current transformer, is it better to have a current of 5A or 1A? The current transformer is installed in the motor circuit of the distribution cabinet.
As long as it does not exceed the allowable load on the CT secondary side
This is related to the capacity of the current transformer, the diameter of the cables, the distance between them, as well as the rated current on the secondary side. Generally, for a current transformer with a capacity of 15 VA, it’s no problem to connect 3 meters within a distance of 100 meters. It’s better if the secondary side current is 1 A, because when the capacity of the current transformer is the same, a lower secondary current allows for a larger load resistance, which in turn enables a greater distance between the devices or more meters to be connected in series