Current sensor DC resistance detection method and device
A technology of current sensor and detection device, applied in measurement devices, instruments, measurement of electrical variables, etc., can solve the problems of high cost of dual power sources, difficult quantitative analysis of DC content, and inability to adjust DC components, so as to reduce measurement errors and impedance. Easy to match effect
Active Publication Date: 2019-08-16
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +2
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[0004] The present invention proposes a current sensor anti-DC performance detection method and device to solve the problems that the DC component cannot be adjusted in the half-wave current detection method, the DC content is difficult to quantitatively analyze, and the cost of the dual power supply of the DC ratio superposition scheme is too high
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[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0029] like figure 1 As shown, a current sensor anti-DC performance detection device includes a current booster 1, wherein the current output by the voltage source is adjusted by the voltage regulator, and then passes through the current booster 1, and the voltage regulator and the current booster 1 once The small current is amplified into a large current, and the size of the primary current can be adjusted. The output range of the current booster 1 directly affect...
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The invention provides a current sensor DC resistance detection method and device. The device comprises a strong current generator, the strong current generator rectifies primary side full-wave AC aspositive half-wave current and negative half-wave current; the positive half-wave current branch is serially connected with a first rectification diode and matching impedance, the impedances of the positive half-wave branch and the negative half-wave branch are adjusted to mutually match through the matching impedance, so that the rectified positive half-wave and negative half-wave are basically symmetric; and the negative half-current current branch comprises AC overlaid with the DC component. The AC-DC environment with adjustable DC proportion is constructed by only using single AC power supply, namely the strong current generator, and the current sensor DC resistance detection is accomplished; the output current is sampled through a standard resistor, and the mutual inductor ratio difference and angular difference can be accomplished by using a Fourier analysis method, thereby accurately evaluating the DC resistance of the current sensor.
Description
technical field [0001] The invention relates to the technical field of electrical measurement, in particular to a method and device for detecting the anti-DC performance of a current sensor. Background technique [0002] The continuous increase of nonlinear loads in the AC grid, the geomagnetic current under the influence of geomagnetic storms, and the increase of high-voltage DC transmission lines will all generate DC components in the primary-side AC grid. The DC component in the primary current makes the iron core operating point of the conventional single-core current transformer easily enter the saturation region, which makes the secondary current of the current transformer seriously distorted and leads to inaccurate measurement. At present, it is found that some illegal electricity stealers steal electricity through half-wave rectification of distribution network lines. The DC component in the half-wave current seriously affects the transmission characteristics of low-...
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IPC IPC(8): G01R35/02G01R35/00
CPCG01R35/007G01R35/02
Inventor 李敏靳绍平肖霞单鹏刘明杨爱超吴宇胡琛宋宏天王浔李东江
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST