A kind of control method of current transformer residual magnetism degaussing device

Abstract

The invention discloses a control method of a current transformer residual magnetism demagnetization device, and belongs to the field of demagnetization equipment. The current transformer residual magnetism demagnetization device comprises an access end which is used for being electrically connected with a current transformer, an analog quantity acquisition module, a central control module, a safety control module, a power supply module and a shorting contact, an adjustable resistor and an adjustable inductor which are controlled by a peripheral drive circuit. The central control module is connected with a human-computer interaction interface. The control method comprises a self-checking and parameter setting stage and a demagnetization stage and process control and the relevant judgment algorithm included in the two stages. Current transformer residual magnetism demagnetization can be realized without power disconnection of the current transformer, and the control method is safer and more reasonable in actuation process in comparison with conventional demagnetization equipment.

Description

technical field [0001] The invention relates to the field of degaussing equipment, in particular to a control method of a circuit transformer residual magnetization demagnetization device, which is used for eliminating the residual magnetism of the circuit transformer iron core. Background technique [0002] Due to the inherent hysteresis of ferromagnetic materials, when the EHV system fails, the strong primary short-circuit current contains a relatively high non-periodic component. When the primary short-circuit current is transmitted to the secondary side through the current transformer, Because the transfer characteristic is different from the AC periodic component, the magnetic flux generated in the iron core cannot be completely balanced by the secondary current. When the fault is eliminated, part of the magnetic flux generated by the non-periodic component will exist in the iron core of the circuit transformer for a long time in the form of residual magnetism. Secondl...

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Problems solved by technology

However, the reality is that when an instantaneous fault occurs in the system, the system has resumed normal operation after re-closing to remove the fault. If the equipment is powered off to deal with the residual magnetism of the current transformer, it is not allowed by the condition-based maintenance of the current power grid operation. of

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