Current sensor test device and test method

Abstract

The invention provides a current sensor test device which comprises a current source (1), a first power supply (2), a second power supply (3), a standard current sensor (4) and an ammeter (5). The current sensor is used to provide primary side bus current for the standard current sensor and a current sensor (6) to be tested. The winding or passing directions of a current bus on the standard current sensor magnetic core and the magnetic core of the current sensor to be tested are opposite, so that the standard current sensor and the current sensor to be tested have opposite current output directions. The ammeter is used to measure the current sum of the standard current sensor and the current sensor to be tested, wherein some or all of the output current of the standard current sensor and the current sensor to be tested are offset. The accuracy of the current sensor to be tested is judged based on the current sum. According to the invention, the accuracy of the test device is limited only by the accuracy of the standard current sensor; the accuracy and stability of the current source and the ammeter have little influence on a test system; the requirements on the accuracy and the stability of the current source and the ammeter are greatly reduced; and the cost is greatly reduced.

Description

technical field [0001] The invention relates to a current sensor calibration technology, in particular, to a current sensor testing device and a testing method. Background technique [0002] Current sensors are widely used in the fields of industry and electric power. The accuracy of current sensors plays a vital role in the accuracy of test results. At present, the accuracy detection method of current sensors generally adopts the source-meter method: using a standard current source to output A current passes through the magnetic core of the current sensor to be tested, and the output current value of the current sensor to be tested is compared with the theoretical value to obtain the accuracy of the current sensor to be tested. The output terminal of the sensor is connected to the ammeter and measured. The theoretical value is obtained by dividing the current value of the primary side or the busbar by the transformation ratio of the standard current sensor. Since the accur...

AI Technical Summary

Problems solved by technology

When the range of the current sensor is relatively large, the output accuracy of the standard current source with large current is affected by internal heating, and the accuracy and stability are severely limited

The output of the current source has a certain error, and the stability of the output of the current source is generally not very good, and it will change with the internal heating and other conditions, which are all unfavorable factors that affect the measurement

[0003] With the continuous development of current sensors, the accuracy of current sensors is also constantly improving, especially the high-precision current sensors of magnetic modulation and flux gates, whose accuracy can reach 1ppm or even higher, while large current sources generally can only achieve The accuracy of the sensor is about 1‰, and the measurement accuracy of the sensor is much higher than the accuracy that the current source can achieve, making the above source-meter method test scheme no longer feasible

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