变频器在应用中当接入低压配电网路时，变压器容量大于变频器容量10倍，三相电压不平衡，电源侧接有功率因数补偿电容及晶闸管整流装置等，这些均干扰变频器的正常运行，以致损坏变频器，下面对这些情况分别做一些讨论。变频器接入低压配电网路，当配电变压器容量大于500kVA， When the inverter is connected to the low-voltage distribution network in the application, the capacity of the transformer is more than 10 times the capacity of the inverter, the three-phase voltage is unbalanced, the power supply side is connected with a power factor compensation capacitor and a thyristor rectifier, which all disturb the inverter Normal operation, so as to damage the inverter, respectively, to do some discussion of these situations. Inverter access to low-voltage distribution network, when the distribution transformer capacity is greater than 500kVA,