Current-Potential Links

The principle of electrical energy measurement is to detect the actual current, the actual voltage and the phase shift (power factor). This values are giving us the instantaneous power . The power multiplied by the time is the consumed energy.
Let’s take a look at a terminal block for a direct connected threephase 4 wire meter.
terminal blockThe red arrows are indicating the so-called “I-P links”, one for each phase. By unfastening the two screws the link can be moved to the right side. So there will be no connection between the current- and voltage measurement circuits. This links are only for meter testing purpose with a test bench, as here the voltages and currents are provided individually. (The voltages are connected to the screw on the right side of the link.)
A meter in the field must have all links closed.

Current-Potential Links
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