SU73418A1 - Method for automatic control of electric arc furnaces, in particular, steel-smelting - Google Patents

Description

The invention relates to upgraded. Designing automatic electric motor controllers for controlling electrodes of electric arc furnaces.

In cymecTiiyiouMx circuits of electromachine regulators, the measured and adjustable parameters are current and voltage in the controlled phase of the pump. The presence in these schemes of a special} K) winding of the excitation (feedback winding), which is connected to the engine children carrying out the test electrode circuit, does not give the necessary effect of stabilizing the control process, since the adjustment of the control characteristics of the adjustable electric furnace is not unaccounted for.

According to the invention, in order to ensure the ratio of the gain of the regulator during the entire melting process, a donor parameter is used, which is a derivative of the current from the controlled phase of the furnace over time, proportional to the penetration distance between the electrode and the metal in the bath. current at each time of melting.

For noluchein derivative; In accordance with the invention, the current strength of the current time suggests that the rototrol (Fig. 1) and the amplitude generator (Fig. 2) be switched on to include an additional transformer / (circuits; 1 case, for one elec- trode).

The primary winding is the donor of the hoio transformer 1 and is connected to a transformer;) at the current 2 measure :; bilayer) or rim 3. With the secondary winding connected in series with the excitation winding 6 at the price of the brushes of the motor 7 not interfering with the electrodes, C5i is required. The amount of time produced by the current is short. The current representing the algebraic sum of the current derivative of time and magnitude, 1 of the proportional speed of the e-electrodes, creates a current that corresponds to the output current equal to the algebraic sum of the values, nponopiiH of normal currents and a nanooptic H. pei-lirail oh phase of the furnace.

Into the adjustments included in the circuits, co-operatively 4 and shupertiruk; nijy od yupoluneriodnn {5

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allow adjustment of the current in the secondary winding of the auxiliary transformer and feedback winding.

Subject invention

Claims (3)

1. A method for automatic regulation of electric arc furnaces, in particular, steel-smelting, in which the current and voltage in an adjustable phase serve as the measured parameters acting through an electromechanical amplifier (tin rototrol, regullex and amplicin) This is due to the fact that, in order to ensure the constant of the regulator's gain coefficient during the entire smelting process, an additional parameter is used as the derivative of the current in the controlled phase and by time proportional to the derivative of distance .mezhdu m Ferrous materials and electrode current at each instant of melting, and this derivative is fed to the motor terminals, the gate electrode is performed movement. 2. Device for implementing the method pop. 1, so that in order to obtain the derivative of the furnace current over time, an additional transformer is used, the primary winding of which is connected to the current transformer terminals in the controlled phase through a full-wave rectifier and is removed from the secondary winding the required value of the derivative. 3. The form of the device according to claim 2, which means that the secondary winding of the additional transformer is included in the brush circuit of the motor that moves the electrode, in series with the excitation winding of the electromechanical amplifier, so that the current in this winding is the algebraic sum of the magnitude of the derivative of the current strength with respect to time and the magnitude proportional to the speed of movement of the electrode creates a flow acting opposite to the resulting flow equal to the algebraic sum of Ichin, .. porschyunalnyh about current and voltage in the phase-controlled furnace. LG 73418 K Zazon Nis g pogai awning five