An AC intrusion fault alarm and anti-maloperation device

Abstract

The invention relates to the technical field of power detection, in particular to an alternating-current intrusion fault warning and maloperation prevention device. Aiming at resistive alternating-current intrusion, an appropriate capacitive load is input between a direct-current power bus and the ground automatically according to an intrusion alternating-current voltage amplitude in order to reduce the intrusion alternating-current amplitude of an alternating current power source into a direct-current power supply system, and accordingly risks of protection maloperation caused by alternating-current intrusion faults of the direct-current power supply system can be reduced. The alternating-current intrusion fault warning and maloperation prevention device is applicable to monitoring of alternating-current intrusion faults of direct-current power supply systems at different voltage classes of 220V / 110V / 48V and the like in substations or power plants and can be used for detection of various alternating-current intrusion faults in a range of 0-285V, warning time is shorter than 0.2s, and recording of alternating-current waveforms and intrusion waveforms is realized; equipment operation reliability of the substations or the power planes can be improved beneficially, maloperation is prevented, and serious and major accidents are reduced.

Description

technical field [0001] The invention relates to the technical field of electric power detection, in particular to an AC intrusion fault alarm and anti-maloperation device. Background technique [0002] The DC power supply system is a system that provides power supply for the protection. Its stability and reliability directly affect the working conditions of the protection. Among them, the AC intrusion into the DC power supply system is one of the main faults that affect the stability and reliability of the DC power supply system. , it can directly lead to protection misoperation, resulting in serious system failure. [0003] Judging from the current situation, there are currently many technical solutions related to devices, patents, and periodicals for alarming and line selection of AC intrusion into DC power supply systems in China. For example: (1) Name: Alarm device for AC intrusion into DC power supply for substations, patent application number: CN201220534548.0, public...

AI Technical Summary

Problems solved by technology

[0005] First, most of the current products or technical solutions only have the function of monitoring and locating the faults of the AC intrusion into the DC power system;

[0006] Second, so far, there are basically no products that have taken anti-maloperation measures to reduce the risk of malfunctions in case of AC intrusion into DC power system failures.

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