Intelligent protection system for secondary open circuit of current transformer

Abstract

The invention relates to a secondary open-circuit intelligent protection system for a current transformer. The system includes a CT secondary circuit terminal block. A CT secondary circuit terminal block relay switch is installed on the CT secondary circuit terminal block. The output side of the relay switch is connected to an acquisition module. , the output of the acquisition module is connected to the A / D conversion module, the A / D conversion module is connected to the data judgment processing module, and the CT secondary circuit terminal block output threshold is set in the data judgment processing module. When the received signal is greater than the threshold value, the data The judging processing module sends a trigger signal to the relay switch coil to make the relay close, and at the same time, the data judging processing module is connected with the data communication module, and sends the received data to the background monitoring computer. The invention can close the CT secondary circuit when the CT secondary open circuit generates high voltage, eliminate the risk of the iron core overheating and burning the winding, and eliminate the threat brought by the secondary side high voltage.

Description

technical field [0001] The invention belongs to the technical field of relay protection for current transformers in power systems, in particular to a secondary open-circuit intelligent protection system for current transformers. Background technique [0002] Once an open circuit occurs on the secondary side of the current transformer in the power system, it is equivalent to the no-load operation of the step-up transformer, and all the current on the primary side is the excitation current, which significantly increases the magnetic flux density in the iron core. On the one hand, the iron loss increases sharply, and the iron core overheats and even burns out the winding; on the other hand, a high voltage is induced on the secondary side, which may break down the insulation and seriously endanger the safety of people and equipment. Contents of the invention [0003] The object of the present invention is to propose a secondary open-circuit intelligent protection system for a ...

AI Technical Summary

Problems solved by technology

On the one hand, the iron loss increases sharply, the iron core overheats and even burns out the winding; on the other hand, a high voltage is induced on the secondary side, which may break down the insulation and seriously endanger the safety of people and equipment.

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