High-current sensor calibration method based on curve fitting method

A calibration method and sensor technology, applied in the direction of instruments, measuring electrical variables, measuring devices, etc., can solve problems such as lack of calibration, affecting work efficiency, and damage to test benches, so as to achieve good applicability, ensure measurement accuracy, and high measurement and calibration The effect of precision

Inactive Publication Date: 2015-01-21
TIANJIN RES INST OF ELECTRIC SCI
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Problems solved by technology

[0003] High-current sensors are widely used, but the calibration lacks certain norms and operation standardization and unified steps, which has caused great obstacles to the operator in the actual calibration process, not only affecting work efficiency, but also causing many test benches to be more complicated. The difference error is large, and even cause damage to the test bench

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  • High-current sensor calibration method based on curve fitting method
  • High-current sensor calibration method based on curve fitting method
  • High-current sensor calibration method based on curve fitting method

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Embodiment 1

[0055] Submitting Unit: Tianjin Tianchuan Electronic Control Equipment Testing Co., Ltd.

[0056] Device Name: High Current Sensor

[0057] Model specification: CWT150B

[0058] Factory number: 28479-25073

[0059] Production unit: PEM

[0060] Calibration date: June 26, 2014

[0061] Calibration location: Measuring room of Tianjin Tianchuan Electronic Control Equipment Testing Co., Ltd.

[0062] Output current range: 0-30KA, this example chooses to measure the full current value of 300A ~ 1000A as the calibration point

[0063] Output current accuracy: ±5%

[0064] Transformation ratio: 0.2mV / A

[0065] Ratio accuracy: ±1%

[0066] ⑴Appearance and accessories inspection

[0067] The shape and structure of the large current sensor should be intact. Switches, buttons, buttons, etc., are flexible and reliable in operation, with clear signs and no loose or mechanical damage to exposed parts. Its nameplate or shell should indicate its name, model, serial number, date of ...

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Abstract

The invention relates to a high-current sensor calibration method based on a curve fitting method. The high-current sensor calibration method includes the steps of (1) appearance check, (2) electricity check, (2) voltage withstand testing, (4) insulation resistance check, (5) selection of a calibration point, (6) intrinsic error measurement and (7) relative error measurement. The high-current sensor calibration method is good in adaptability, a high-current source method or a calibration small resistance method can be adopted respectively for measurement and calibration according to relative errors, and the two methods are high in measurement and calibration precision. By means of the curve fitting method, a measurement result is obtained indirectly. The high-current sensor calibration method solves the problem that high-current sources are not sufficient when ultrahigh currents are measured, and guarantees measurement precision.

Description

technical field [0001] The invention belongs to the field of electric appliance detection equipment, in particular to a large current sensor calibration method based on a curve fitting method. Background technique [0002] Large current sensor is a device that converts large current into small voltage output according to a certain ratio, such as Rogowski coil, current comparator, Hall transformer, etc., so as to realize real-time measurement of large current. [0003] High-current sensors are widely used, but the calibration lacks certain norms and operation standardization and unified steps, which has caused great obstacles to the operator in the actual calibration process, not only affecting work efficiency, but also causing many test benches to be more complicated. The difference error is large, and even cause damage to the test bench. Therefore, an urgent problem to be solved is to seek a calibration method for large current sensors with better applicability. Contents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00
Inventor 穆生乐李洁平国亚磊李昕孙宁李颖
Owner TIANJIN RES INST OF ELECTRIC SCI
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