A method and system for judging the insulation state of a power cable
A technology of insulation status and power cables, applied in the electrical field, can solve problems such as interference and threshold judgment misjudgment, and achieve the effects of eliminating noise, improving accuracy, and facilitating maintenance
Active Publication Date: 2020-05-19
HUAZHONG UNIV OF SCI & TECH
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[0005] In view of the defects of the prior art, the purpose of the present invention is to solve the technical problem that the existing power cable insulation state judgment method is interfered by the external environment, and the threshold judgment is prone to misjudgment
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[0050] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0051] The invention discloses a method and system for judging the insulation state of a power cable based on a magnetic modulator, including: digital filtering for the zero drift problem of the magnetic modulator; performing fuzzy clustering on the filtered data; using the cluster center point and the distance from the origin The coordinates of the farthest point are used to calculate the insul...
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The invention discloses an insulation state judging method and system of a power cable. The method comprises the following steps: preforming digital filtering on a zero drift problem of a magnetic modulator; performing fuzzy clustering on the filtered data; and calculating an insulation degradation probability of each power cable line by using a clustering center point and coordinates of a farthest point away from the origin. The digital filtering of the zero drift problem of the magnetic modulator comprises the following steps: calculating n initial basic value; performing arithmetic averageon the base values and a measured value; updating the basic value data; and performing Kalman filtering. According to the insulation state judging method based on the magnetic modulator proposed by the invention, the high frequency noise can be filtered based on the Kalman filtering, the low frequency fluctuation noise can be effectively filtered based on the basic value filtering, the measurementerror caused by the zero drift of the magnetic modulator can be efficiently removed, and meanwhile, the insulation degradation probability of the power cable is provided to accurately judge the insulation state of the power cable.
Description
technical field [0001] The present invention relates to the field of electrical technology, and more specifically, to a method and system for judging the insulation state of a power cable. Background technique [0002] The magnetic modulator is a high-precision current sensor based on the principle of magnetic modulation, which can be used to measure the leakage current of the power cable line, so as to judge the insulation status of the power cable. However, there are currently two problems that have not been well resolved: 1) The leakage current of a power cable with good insulation is generally at the microampere level. When measuring microampere-level DC current, the magnetic modulator has zero drift. In addition, due to the random error of measurement and the uncertainty factors brought by the environment, the accuracy and stability of the measurement are greatly disturbed. 2) At present, the judgment of the insulation state of power cables is mainly based on the thres...
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IPC IPC(8): G01R31/12G01R31/08
CPCG01R31/083G01R31/085G01R31/088G01R31/1272
Inventor 黄煜彬杜步阳郝嘉睿周磊姚雅涵李弘毅
Owner HUAZHONG UNIV OF SCI & TECH