Low-voltage side voltage regulating and dynamic compensating device for electric arc furnace

Abstract

The invention relates to a voltage regulation and dynamic compensation device on the low-voltage side of an arc furnace, which comprises a high-voltage wireless telegauge, a high-voltage switch cabinet, a controller, a contactor, a compensating capacitor, a booster transformer and an arc furnace transformer. The device is characterized in that a booster transformer is arranged on the low-voltage side of the arc furnace transformer, the compensating capacitor is installed on the high-voltage side of the booster transformer, current and voltage signals on the high-voltage side of the arc furnace are gathered through a current transformer in the high-voltage wireless telegauge and a voltage transformer in the high-voltage switch cabinet, the gathered signals are sent into the control to be processed, and switching signals are sent to the contactor in stages to control the switching of the compensating capacitor; and a load is connected between the booster transformer and the arc furnace transformer. The device solves the problem of the reactive compensation from the source of the reactive load, improves the compensation efficiency, greatly reduces the physical volume of the compensation device, and reduces the cost for the system and the floor space.

Description

technical field [0001] The invention relates to the technical field of reactive power compensation, in particular to a voltage regulation and dynamic compensation device at the low-voltage side of an electric arc furnace. Background technique [0002] The proportion of reactive power load in the traditional electric arc furnace is too large, resulting in the following unfavorable situations: [0003] 1. The load of the working transformer is nearly doubled compared with the actual active load, which makes the copper loss of the transformer nearly double, and the iron loss also increases suddenly. Seriously shortened. [0004] 2. The line loss is nearly doubled (line loss ΔW=I 2 Rt, R--line resistance). [0005] 3. The terminal (working terminal) voltage is reduced, prolonging the product production cycle, affecting product quality and increasing production costs. [0006] 4. The workload of the main transformer of the substation and the switchgear of the substation are i...

AI Technical Summary

Problems solved by technology

[0002] The proportion of reactive power load in the traditional electric arc furnace is too large, resulting in the following unfavorable situations:

[0003] 1. The load of the working transformer is nearly double that of the actual active load, so that the copper loss of the transformer is nearly doubled, and the iron loss is also increased suddenly. severely shortened

[0004] 2. The line loss is nearly doubled (line loss ΔW=I 2 Rt, R--line resistance)

[0005] 3. The terminal (working terminal) voltage is reduced, prolonging the product production cycle, affecting product quality and increasing production costs

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