Sampling monitoring device used for electromagnetic compatibility test and sample monitoring method
An electromagnetic compatibility and monitoring device technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of low accuracy, low efficiency, and lack of distortion counts, etc., and achieve high accuracy and high work efficiency. Effect
Active Publication Date: 2017-11-07
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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Problems solved by technology
[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a sampling monitoring device for electromagnetic compatibility tests, and solve the problem that the sampling monitoring device in the prior art relies on Technical problems such as low accuracy of manual judgment, low efficiency, inability to monitor analog quantities, and lack of statistics on the number of distortions
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[0024] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0025] Such as figure 1 As shown, the sampling monitoring device used for electromagnetic compatibility test includes: sampling selection switch for sampling data type selection, discrimination circuit for waveform distortion discrimination, counter for statistics of waveform distortion times, signal for measured object The collected data message interface, transformer interface and AC module interface and a display for displaying distortion times and waveform distortion discrimination coefficients.
[0026] A photoelectric conversion circuit and a decoding circuit are also connected between the data message interface and the D / A conversion circuit. The digital interface of the measured object ...
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The invention discloses a sampling monitoring device used for electromagnetic compatibility test. A sampling selection switch selects a sampling data type. A band-pass filtering circuit filters the sampling waveform output by the sampling selection switch to output a fundamental waveform. A subtraction circuit carries out subtraction on the sampling waveform and the fundamental waveform to acquire deviation waveform. A peak detection circuit detects the peak value of the fundamental waveform. An adjustable proportional circuit calculates the waveform distortion discrimination threshold according to the peak value, which is output by the band-pass filtering circuit, of the fundamental waveform and a waveform distortion discrimination coefficient output by a discrimination coefficient adjustment circuit. A comparison circuit compares the deviation waveform and the waveform distortion discrimination threshold. If the deviation waveform is greater than the waveform distortion discrimination threshold, a counter adds one. The invention further discloses a sampling monitoring method. The method can automatically analyze and discriminate the sampling waveform by setting the waveform distortion discrimination threshold without manual intervention in the whole process. The method has the advantages of high working efficiency and accurate discrimination result.
Description
technical field [0001] The invention relates to a sampling and monitoring device for electromagnetic compatibility tests, and also relates to a sampling and monitoring method for electromagnetic compatibility tests, belonging to the technical field of power system protection and control. Background technique [0002] As an important part of the power grid, the sampling of AC quantities such as current and voltage is closely related to the safe and reliable operation of the power system. In view of the complex electromagnetic environment on site, the anti-interference ability of the sampling link is particularly important. Therefore, EMC testing has become an indispensable key item in the process of R&D, production, and commissioning of related equipment, and it runs through all stages of material selection, module testing, machine testing, and system testing. Waveform quality is an important indicator of EMC testing. When electromagnetic interference such as electrical fast...
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Login to View More IPC IPC(8): G01R29/04G01R31/00
CPCG01R29/04G01R31/001
Inventor 李帅陈福锋龚世敏赵谦
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD