Wide-band test device and method for measuring impendence of grounding body
A technology of testing equipment and grounding body, which is applied in the direction of measuring equipment, measuring resistance/reactance/impedance, impedance measurement, etc., and can solve the problem of narrow frequency range of frequency conversion testing equipment
Active Publication Date: 2018-03-06
STATE GRID CORP OF CHINA +2
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[0005] The object of the present invention is to provide a kind of broadband testing device and method for measuring the impedance of the grounding body, to overcome the problem of the narrow frequency range of the existing frequency conversion testing equipment
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[0032] see figure 1 Shown, the present invention is a kind of broadband testing device for measuring ground body impedance, comprises the excitation source based on analog PI regulation, controller (DSP broadband SPWM and signal processing system) based on DSP and human-computer interaction system based on ARM .
[0033] The excitation source based on analog PI adjustment includes AC / DC converter, DC / AC converter, PI regulator, SPWM and comparator; the input end of AC / DC converter is the input end of the excitation source based on analog PI adjustment; AC The output terminal of the / DC converter is connected to the input terminal of the DC / AC converter, and the output terminal of the DC / AC converter is used as the output terminal of the excitation source based on analog PI regulation; the output terminal of the DC / AC converter is connected to the first comparator An input terminal, the output terminal of the given circuit is connected to the second input terminal of the compa...
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The invention discloses a wide-band test device for measuring the impendence of a grounding body. The wide-band test device includes an excitation source based on analog PI regulation. The excitationsource based on analog PI regulation includes an AC / DC converter, a DC / AC converter, a PI regulator, an SPWM, and a comparator. The input end of the AC / DC converter is used as the input end of the excitation source based on analog PI regulation. The output end of the AC / DC converter is connected with the input end of the DC / AC converter, and the output end of the DC / AC converter is used as the output end of the excitation source based on analog PI regulation. The output end of the DC / AC converter is connected with a first input end of the comparator, the output end of a given circuit is connected with a second input end of the comparator, the output end of the comparator is connected with the input end of the PI regulator, and the output end of the PI regulator is connected with the control end of the AC / DC converter. The input end of a controller based on DSP is connected with the output end of the DC / AC converter, and the two output ends of the controller based on DSP are respectively connected with the input ends of the given circuit and the SPWM. The output end of the SPWM is connected with the control end of the DC / AC converter. The output band is as wide as 20Hz to 30kHz.
Description
technical field [0001] The invention relates to the field of ground impedance measurement, in particular to a broadband testing device and method for measuring ground impedance. Background technique [0002] The grounding grid is laid underground and in close contact with the soil. Oxygen, acidic solution, stray current and microorganisms in the soil all have a certain erosion effect on the grounding grid. The characteristics and composition of the soil in different regions are also different, and their corrosion ability to the grounding grid is also different. Therefore, monitoring and sensing the operating status of the grounding grid and its timely maintenance are extremely important to ensure the reliable operation of electrical equipment and the safety of power supply and use. The impedance characteristics of the grounding grid become the only means to characterize and perceive the operating state of the grounding grid. Since there is a large amount of power frequency...
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IPC IPC(8): G01R27/20G01R27/18G01R27/08G05B19/042G05B11/42
Inventor 李志忠刘树林王森吴经锋张鹏高峰申巍王南周艺环张小平王辰曦吴子豪
Owner STATE GRID CORP OF CHINA