Short-network compensation device

Product introduction

According to the capacitor installation location, there are generally three types of reactive power compensation for the submerged arc furnace: high-voltage reactive power compensation at the high-voltage side and medium-voltage side of the furnace transformer, and direct compensation at the low-voltage side and short-circuit side of the furnace transformer. High and medium voltage side reactive power compensation has obvious effects on improving the power supply condition of the high voltage side and increasing the operating power factor. However, it is powerless to reduce the reactive power loss of the short network at the low voltage side, and it is powerless to increase the output of the transformer and improve the three-phase imbalance caused by the layout of the three-phase short network. For submerged arc furnaces, the generation of reactive power is mainly caused by the arc current. If compensation is performed on the low-voltage side, a large amount of reactive current will flow directly through the loop formed by the low-voltage side capacitor and the arc, instead of passing through the short network, transformer and power supply network before the compensation point. While improving the power factor, the active power output of the transformer can be increased, and the reactive power consumption of the transformer and the short network can be reduced. At this time, the reactive power consumption of the short network is compensated locally, and the reactive current does not flow through the transformer. While improving the power factor, the loss of the transformer and the short network is reduced, and the active output of the transformer is also increased. The power input from the transformer to the furnace will increase. At the same time, under the appropriate compensation mode, the three-phase imbalance caused by the layout of the three-phase short network can be improved, Thus, the power center, thermal center and furnace center of the electric furnace coincide, the crucible of the electric furnace increases, and the heat distribution is reasonable, so as to improve the reaction conditions, improve the output and quality, and reduce the unit power consumption and raw material consumption. In addition, the short network compensation should also consider the harmonic factor to absorb the harmonic, reduce the harmonic content entering the transformer and other users' electrical systems, and prolong the service life of the equipment accordingly.

Product features

  (1) Large installation capacity

  (2) Low voltage

  (3) High current

  (4) High harmonic current during operation

  (5) Harsh environment (high temperature, dust, etc.)

  (6) The inrush current is too large during switching, which is not suitable for frequent switching

  (7) Split phase compensation is adopted to improve the three-phase imbalance

Application field

       Reactive power compensation of high reactive power equipment such as submerged arc furnace and calcium carbide furnace.