| 摘要 |
<p>1. An arrangement for the electrode regulation of an arc furnace which is fed from a transformer and has an impedance regulator for each electrode, which controls the assigned setting element for the level adjustment of the electrode or of each of the electrodes in rotary-current arc furnaces, having a measuring element for supplying a magnitude proportional to the electrode voltage (U) measured between the secondary connecting terminal of the transformer and the furnace case and for supplying a magnitude proportional to the electrode current (I), where the operating points of predetermined characteristics of the furnace operation respectively assigned to a voltage stage of the furnace transformer can be stored as a theoretical impedance value (z*) in the cells of a digital store (1) provided for each electrode, where the theoretical impedance value (z*) of the respectively selected cell, which permanently occurs at the output of the store, is fed to the pulse regulator by a digital-to-analogue converter (8) and the voltage stage of the furnace transformer or the number of the characteristics and the assigned theoretical impedance values can be fed into the storage cells of the digital store (1) by means of numerical adjuster (2 or 3, 5, 6), characterised in that change-over switches (S2, S3) are provided which in their one position feed freely selectable magnitudes for the electrode voltage and the electrode current to a divider (7), and in their other position feed magnitudes which are proportional to the actual values of electrode voltage and electrode current to said divider, and the divider (7) determines theoretical impedance values (z*) from these magnitudes which can be fed to the store (1) as digital magnitudes and which can be alternatively input into the store in place of the stored theoretical impedance value with the aid of a further switch (T4), and that in order to correct the theoretical analogue impedance value (z*) predetermined in this manner a correction element (22) is provided which can be connected and disconnected by means of a change-over switch (S4) which can be manually operated.</p> |
