Electroslag furnace transformer excitation inrush current suppression device and method

Abstract

The invention discloses a magnetizing inrush current suppression device and method for an electroslag furnace transformer, belongs to the field of magnetizing inrush current suppression devices and methods, and aims to solve the problems of maloperation of a transformer protection device caused by magnetizing inrush current, induction of operation overvoltage, damage to electrical equipment and insufficient system safety caused by lack of tripping protection. Comprising an isolation transformer, a first photoelectric isolation module, a second photoelectric isolation module, a communication module, a man-machine interface module and a main control module, the isolation transformer, the first photoelectric isolation module and the second photoelectric isolation module are respectively connected with the main control module, the communication module and the man-machine interface module are respectively connected with the main control module, and the main control module calculates a closing angle and sends a closing instruction. The system is protected by judging the load side voltage and the voltage constant value and judging the power side current and the overcurrent protection constant value, damage to electrical equipment caused by overvoltage can be prevented, and the safety of the system is guaranteed through a tripping protection function.

Description

technical field [0001] The invention relates to the technical field of excitation inrush current suppression, in particular to an electroslag furnace transformer excitation inrush current suppression device and method. Background technique [0002] The inductance coil with a ferromagnetic magnetic circuit, because of its compliance with the law of flux linkage conservation, will generate a gradient magnetic bias and an alternating steady-state magnetic flux related to the phase angle of the sudden increase in the applied voltage when the applied voltage suddenly rises. , the bias may lead to offsetting the original remanence, or may increase the original remanence to make the magnetic circuit saturated. If the magnetic circuit is saturated, the excitation reactance will drop sharply, and then a large value of the excitation inrush current will be generated. Therefore, controlling the level of residual magnetism caused by the sudden rise of the externally applied voltage and ...

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Problems solved by technology

[0015] In order to limit the excitation inrush current of the transformer to a certain range and prevent the system from tripping without fault due to the large excitation inrush current of the transformer, the invention provides a device and method for suppressing the excitation inrush current of the transformer in the electroslag furnace, which can solve the problem of power supply caused by the large excitation inrush current of the transformer. The fault-free tripping of the system affects the normal production and smelting of the electroslag furnace, resulting in abnormal product quality and large economic losses.

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