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Under normal circumstances, in order to solve the problem of low power factor of submerged arc furnaces, my country currently uses capacitance compensation to solve the problem. Usually reactive power compensation is performed on the high voltage side. However, because the high voltage side compensation cannot solve the three-phase balance problem, and because The inductance of the short network accounts for more than 70% of the inductive reactance of the entire system, so the high-voltage end compensation does not reduce the inductance of the short network system and improve the short network power factor. The purpose of increasing transformer output is only meaningful to the power supply department.

Therefore, at present, some units have adopted high and low voltage simultaneous reactive power compensation measures on new furnaces to solve the above problems. Compensation at the short network end can greatly improve the power factor of the short network end and reduce power consumption. The large amount of reactive power consumption and imbalance of the side short network, taking into account the effective improvement of power factor and implementing reactive in-situ compensation technology transformation, is technically reliable and mature, and economically speaking, input and output are proportional of. On the low-voltage side of the submerged arc furnace, the reactive power compensation is implemented on the low-voltage side of the short-circuit reactive power consumption and the three-phase imbalance caused by the inconsistent layout length, whether in terms of improving power factor, absorbing harmonics, or increasing production and reducing consumption , Both have incomparable advantages over high pressure compensation. However, due to the high cost and the harsh working environment, the service life is greatly affected. At the same time, the reactive power compensation at the low-voltage end of the short network also brings about the increase of harmonics. Therefore, measures must be taken to suppress the 3-7th harmonics. As a result, the investment is increased, the investment recovery period is lengthened, and the follow-up maintenance costs are high, and the overall benefits are not good. Generally only suitable for new furnaces.