Electricity background:

　　1) The high-order harmonics generated by the high-voltage 35KV side traction rectifier inverter device, the dominant harmonics are 11th, 13th, 23rd and 25th;

　　2) The natural power factor of the low-voltage side is low, and the reactive power and harmonics fluctuate greatly when the load is working at night;

　　3) The natural power factor of the high-voltage side is relatively high. Due to the long power supply line, there is a phenomenon of reactive power reverse transmission at night when the load is low;

　　Recommended plan:

　　1) In terms of harmonics, the APF active filter is directly connected to the bus bar below 35KV through a step-up transformer to filter out higher harmonics.

　　2) In terms of reactive power compensation, HDVG is connected to the bus bar below 35KV through a 10KV step-up transformer to adjust the power factor in both directions to prevent reactive power reverse transmission.

　　Customer benefits:

　　Reduce the harmonic content to ensure the safe and stable operation of the power supply system in the metallurgical industry;

　　The safety improvement of the power factor can avoid the fines caused by reactive power backward transmission;

　　Energy saving and consumption reduction, reducing harmonic content, avoiding equipment malfunction;

　　reduce manufacturing cost.