Schneider Switch C65H 4P C63 VIGI      Engineer Wang  183-5974-1202

The power grid supplies power to the frequency converter through a three-phase diode rectifier bridge, with a power factor greater than 0.97. Since the diode rectifier bridge only turns on at the peak of the grid voltage to charge the capacitor, the current waveform is a sharp spike with a narrow conduction angle. The supply current contains 6K±1 order harmonics (K=1, 2, 3…), and the harmonic content decreases as the inductance of the incoming line reactance and DC filtering reactance increases. Generally speaking, after adding a reactor, the 5th, 7th, 11th and 13th harmonics still account for 40%, 35%, 25% and 20% respectively.

Schneider Switch C65H 4P C63 VIGI

For occasions where there are other inductive loads on the power supply transformer, a TSC dynamic reactive power compensation device with harmonic filters of various orders can be installed; for workshops that are almost entirely equipped with AC-DC-AC voltage-type frequency converters, since there is no need to compensate for fundamental reactive power, harmonic reactive power needs to be filtered out, and a device with fixed harmonic filters should be installed. In order to prevent over-compensation under light load from boosting the grid voltage, the fundamental wave capacitive reactance provided by the filter should consider harmonic heating and overvoltage issues during design.

Schneider Switch C65H 4P C63 VIGI

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