Why can't the leakage protection switch be installed on the power input of Schneider apcups

When the leakage protection switch is added in front of the Schneider UPS power supply device, although there is no leakage phenomenon in the ups, the magnetic flux vector formed by the high-order harmonic in the core and the hysteresis effect of the core are unlikely to produce zero similarity. The leakage artifact makes the leakage protection switch trip frequently. Therefore, leakage protection switch cannot be installed on the AC input of Schneider UPS power supply.

When the power supply is normal, the rectifier of Schneider UPS power supply will charge the battery and provide the working DC voltage for the inverter. When the mains power is cut off, the battery pack supplies DC working voltage to the converter and outputs standard AC.

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When working in online mode, UPS directly rectifies the AC input power supply. Without power factor compensation, serious harmonics will be caused in the transmission line *.

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During normal operation, the leakage current will not pass through the leakage protection switch circuit except for the working current. At this time, the current amplitude through the zero sequence transformer (detection transformer) is equal, the direction is opposite, and the sum is zero. Flux in the core of the induction transformer. It is also equal to zero, the secondary winding has no output, the automatic switch keeps on state, and the leakage protector works normally. When leakage or electric shock occurs to the protected electrical appliances and lines, there is a ground fault current, so that the current flowing through the detection transformer is not zero, the flux is induced in the transformer core, and the secondary winding has induced the current. After generation, output after amplification, make the leakage release action, push the automatic switch to trip, and achieve the purpose of leakage protection.

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When a leakage protection switch is added in front of Schneider apcups power supply, although UPS has no leakage phenomenon, similar leakage will occur due to the magnetic flux vector formed by high-order harmonic in the core and the hysteresis effect of the core, which cannot be zero. In the illusion, the leakage protection switch often trips. Therefore, the AC input of UPS cannot be installed with leakage protection switch.