1V wiring
Advantages: In the case of reducing the number of secondary cable cores, the third phase (phase B) current is obtained
Disadvantages: Since there are only two current transformers, when one of the phases is reversed, the current in the common line becomes the phasor difference of the other two-phase currents, causing incorrect measurement, and the probability of incorrect wiring is greater; On-site single-phase method to verify the energy meter brings difficulties
2 phase separation wiring
Disadvantages: increase the number of cable cores in the secondary circuit
Advantages: Reduce the probability of wrong wiring, improve the reliability and accuracy of the measurement, and bring convenience to the on-site inspection of the energy meter and check the wrong wiring. It is the first choice for wiring.
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