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Amplitude frequency calibration system and method of current sensor

A current sensor and calibration system technology, which is applied in the field of measuring instruments, can solve problems such as insufficient current accuracy and power measurement accuracy, and achieve the effects of meeting high-precision measurement requirements, removing the effect of variable ratio, and improving calibration efficiency

Inactive Publication Date: 2018-06-29
INNO INSTR (CHINA) INC
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Problems solved by technology

[0004] The amplitude-frequency calibration system and method of the current sensor of the present invention solve the technical problem of insufficient current accuracy and power measurement accuracy caused by the amplitude measurement error introduced by the current sensor when the current measuring instrument uses the current sensor to measure the current

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  • Amplitude frequency calibration system and method of current sensor
  • Amplitude frequency calibration system and method of current sensor

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Embodiment Construction

[0051] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0052] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar extensions without violating the connotation of the present invention, so the present invention is not limited by the specific implementations disclosed below.

[0053] see figure 1 and figure 2 , Amplitude-frequency calibration system of current sensor, including: current signal source, current measuring instrument, controller. The current measuring device has at least two current measuring channels. After the current signal line of the...

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Abstract

The invention provides amplitude frequency calibration system and method of a current sensor. A current signal line of a current signal source is connected with a first current measurement channel ofa current measurement apparatus, then passes through a coil of a to-be-calibrated current sensor and returns to the current signal source; a current output end of the to-be-calibrated current sensor is connected to the current measurement apparatus; the current signal source outputs a first current signal; the to-be-calibrated current sensor generates and outputs a second current signal under excitation of the first current signal; the current measurement apparatus samples the first current signal and the second current signal, and performs fitting to obtain a transfer function of the to-be-calibrated current sensor; an amplitude frequency response function is determined; and the frequency of the measured second current signal is substituted into the amplitude frequency response function to obtain an amplitude attenuation coefficient, so as to calibrate the current amplitude of the to-be-calibrated current sensor. The technical problems of insufficient current accuracy and power measurement accuracy, resulting from the amplitude measurement error introduced by the current sensor when the current measurement apparatus measures current by using the current sensor, are solved.

Description

technical field [0001] The invention relates to the field of measuring instruments, in particular to an amplitude-frequency calibration system and method for a current sensor. Background technique [0002] In instruments with current measurement functions such as ammeters and power measuring instruments, current sensors must be used to measure large currents that exceed the measurement range of the instrument. However, due to its working principle and structure, the current amplitude will attenuate, and the amplitude error introduced by the current sensor will greatly reduce the accuracy of the current parameters measured by the measuring instrument. [0003] Since the measurement error of the current sensor has an important impact on the high-precision current measuring instrument in power fault diagnosis and power monitoring, it is necessary to calibrate the amplitude measurement error of the current sensor. Most of the current amplitude-frequency calibration methods use ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00G01R35/02
CPCG01R35/005G01R35/02
Inventor 李楚元
Owner INNO INSTR (CHINA) INC
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