Electric Arc Furnace Reactor
In order to stabilize the arc and limit the short-circuit current, a reactance capacity of about 35% of the transformer capacity is needed to be connected in series into the main circuit of the transformer. For large-scale arc furnace transformer, it has reactance value which can meet the needs, without external reactor; for the transformer less than 10MVA, the reactance does not meet the requirements, it needs external reactor at the primary side. The structural characteristics of the reactor are as follows: even though the short-circuit current is passed, the iron core will not occur magnetic saturation.
The reactor can be installed inside the furnace transformer, which is called an internal type; it can also be made into an independent reactor installed outside the transformer, which is called the external type.
Generally, the furnace transformer should be connected in series with the reactor, so that the sum of short-circuit impedance and reactor reactance of transformer can reach 0.33 ~ 0.5 standard value (based on the rated capacity of furnace transformer).
For the furnace transformer with a capacity less than 10MVA, sometimes a series reactor is installed on its high voltage side to reduce short circuit current and stabilize arc. For large capacity furnace transformer, its leakage reactance is large enough, and no series reactor is needed.
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