An AC intrusion fault alarm and anti-maloperation device
A fault alarm and AC intrusion technology, which is applied to fault locations, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve problems such as reducing the risk of misoperation, and achieve the goal of reducing protection misoperation The effect of risk, convenient investigation, high economic benefit and social benefit
Active Publication Date: 2018-11-20
GUANGXI POWER GRID CO LIUZHOU POWER SUPPLY BUREAU +1
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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.
Method used
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[0028] In order to better understand the present invention, the present invention will be further described below in conjunction with accompanying drawing:
[0029] like figure 1 As shown, an AC intrusion fault alarm and anti-maloperation device includes a sampling isolation unit, an amplification filter unit, an AD sampling unit, a main processor MCU unit, a display unit, an alarm output unit, a storage unit, a capacitance control unit, and a capacitance output unit. unit; the sampling isolation unit is connected to the amplification filtering unit; the amplification filtering unit is connected to the AD sampling unit; the AD sampling unit is connected to the main processor MCU unit; the display unit, the alarm output unit, the storage unit, the capacitor The control unit is connected with the main processor MCU unit respectively; the capacitor output unit is connected with the capacitor control unit; the sampling isolation unit includes a voltage division sampling module and...
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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...
Claims
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IPC IPC(8): H02H9/04G01R31/40G01R31/08
CPCG01R31/08G01R31/40H02H9/04
Inventor 吴激勇陈炜智龙玉忠陈丕雅黎永华王亚叶青超刘卫程建建王娟徐玉凤李永祥陈华寿叶风杰
Owner GUANGXI POWER GRID CO LIUZHOU POWER SUPPLY BUREAU