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An analog disconnection fault detection method, system and acquisition device

A technology of disconnection fault and detection method, which is applied in the direction of measuring device, measuring circuit, continuity test, etc., can solve the problems of low detection efficiency and inaccurate detection of analog disconnection fault, achieve high detection efficiency and improve stability and reliability, reducing the risk of malfunction

Active Publication Date: 2021-06-04
XUJI GRP +4
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Problems solved by technology

[0004] The purpose of the present invention is to provide an analog disconnection fault detection method, system and acquisition device, which are used to solve the problems of inaccurate detection and low detection efficiency of analog disconnection faults in relay protection devices in the prior art

Method used

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  • An analog disconnection fault detection method, system and acquisition device
  • An analog disconnection fault detection method, system and acquisition device
  • An analog disconnection fault detection method, system and acquisition device

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Embodiment Construction

[0024] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0025] Embodiment of a kind of analog disconnection fault detection system of the present invention:

[0026] An analog disconnection fault detection system, such as figure 2 As shown, the system includes AC transformer plug-in, backplane and mining protection plug-in. The acquisition and protection plug-in includes AD pre-filter circuit, AD chip, FPGA, CPU and corresponding peripheral circuits and power supply. The AD chip is connected to the FPGA through the SPI interface, and the FPGA is connected to the CPU through the LBC bus. The AC transformer plug-in and the safety plug-in realize the interconnection of analog input and output through the plug-in connector and the backplane. The input analog quantity of the acquisition and protection plug-in is connected to the analog input terminal of the A / D chip after passing through the AD pre-filt...

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Abstract

The invention provides an analog disconnection fault detection method, system and acquisition device, which generates fault analog signals, performs analog-to-digital conversion on the input signals of each analog channel and the fault analog signals, and collects each analog fault at a set sampling frequency. The data after analog-to-digital conversion of the measurement channel; read the converted data, and use the sampling data of the disconnection fault analog signal as the reference value to judge whether the sampling data of each analog The sampling data of the measurement channel is compared with the reference value, and the data collected by the same analog-to-digital conversion channel for two adjacent samplings is compared for the difference. If the difference obtained by the two times of difference is less than the corresponding set value , it is judged that the analog channel has an analog disconnection fault. The invention has strong real-time performance, high detection result accuracy and high detection efficiency, reduces the risk of misoperation caused by analog disconnection, and improves the operation stability and reliability of the relay protection device.

Description

technical field [0001] The invention belongs to the field of relay protection automation of electric power engineering, and in particular relates to an analog disconnection fault detection method, system and acquisition device. Background technique [0002] With the advancement of the times, the rapid development of science and technology, the new chip technology and the great progress of computer network technology have promoted the intelligence of substation automation. With the emergence of mechatronics equipment such as intelligent switches and photoelectric current and voltage transformers , The relay protection device has been in continuous development. At present, the relay protection device generally adopts the modular plug-in method. The AC transformers are gathered together to form the AC transformer plug-in, and the AD sampling circuit and the CPU are gathered together to form the sampling and protection plug-in. The AC transformer plug-in and the sampling and pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/54G01R31/58
CPCG01R31/50
Inventor 王振华黄旭吕玄兵葛维春周东杰于同伟赵会彬李籽良宋一丁卢岩王全海郑志勤郭震王刚曹昆
Owner XUJI GRP
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