Separation measurement method for zero point and measurand of open-close current sensor
A technology of current sensor and measurement method, applied in the direction of measuring electrical variables, measuring devices, measuring only current, etc., can solve the problem that the actual size of leakage current in the pipeline cannot be reflected, and achieve convenient installation, simple operation, and improved accuracy. Effect
Active Publication Date: 2021-10-19
珠海多创科技有限公司
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However, since the leakage current in the pipeline and the zero point of the sensor both appear as DC voltage signal output at the output end, that is, the actual measurement result of the sensor is the superposition of the two, so it cannot reflect the actual size of the leakage current in the pipeline, which gives accurate judgment The corrosion of the pipeline has brought adverse effects, so it is necessary to separate the same vector signal superimposed on the output end of the open sensor to improve the accuracy of pipeline leakage current measurement and realize accurate judgment of pipeline corrosion
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[0014] In order to make the above and other objects, features and advantages of the present invention more obvious, the following specifically cites the embodiments of the present invention, which are described in detail as follows.
[0015] Current sensors work on the principle of electromagnetic induction, and the output of the sensor is directly related to the magnetic circuit of the iron core. For closed current sensors, due to the fixed magnetic circuit, the zero point of the sensor is relatively stable, and the error is small; for open-close current sensors, after each opening and closing, the magnetic circuit will change with the change of the air gap, the sensor The zero point of the sensor will also change accordingly, so in actual measurement, if the measured current is not zero, the zero point of the sensor and the output of the measured current cannot be distinguished during measurement, which will affect the accuracy of the measurement.
[0016] For this reason, t...
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The separation measurement method of the split current sensor zero point and the measured, including the following steps: first measurement: install the split current sensor on the measured conductor, after the installation is completed, power on the sensor, and record the output of the split current sensor at this time Voltage and the output scale of the split current sensor; secondary measurement: change the output scale of the split current sensor, and then record the output voltage of the split current sensor and the output scale of the split current sensor; calculate the split type according to the following formula Current sensor zero point U 0 And the current I of the conductor under test: the measuring method of the present invention can separate the same vector signal superimposed on the output end of the sensor, effectively improving the accuracy of the measurement results, thereby accurately judging the corrosion of the pipeline and equipment of the ship .
Description
technical field [0001] The invention belongs to the technical field of electronic power equipment monitoring, and in particular relates to a method for measuring a direct current signal of a pipeline or equipment by using a current sensor. Background technique [0002] The opening and closing structure of the opening and closing current sensor can be conveniently installed on-line, which meets the continuous power measurement requirements of the equipment, so it is widely used in the power system, especially in some special occasions, such as the installation of ship pipelines. The detection of leakage current can judge the corrosion of the pipeline by detecting the magnitude of the tiny current in the pipeline by the current sensor. However, since the leakage current in the pipeline and the zero point of the sensor both appear as DC voltage signal output at the output end, that is, the actual measurement result of the sensor is the superposition of the two, so it cannot ref...
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IPC IPC(8): G01R19/00
CPCG01R19/0053G01R19/0092
Inventor 范群国白咪陈荣郑若麟罗耀龙
Owner 珠海多创科技有限公司