Problems with current transformers in measuring current
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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 surface of the distribution cabinet, at the on-site operation panel, and on 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.
It depends on whether the power consumption of the entire circuit is within the power supply capacity of the transformer; if so, it is possible in principle. It is recommended to prioritize models with higher power, 1A rating, and cables made of copper with a cross-sectional area of at least 2.5 square millimeters. When connecting so many components in series, be sure to pay attention to safety; it is recommended to connect bidirectional clamping diodes in parallel across the secondary side of the transformer for protection.
As long as it does not exceed the allowable load on the CT secondary side； The allowable load on the CT secondary side for 1A is much higher than that for 5A, so it is recommended to choose 1A