A kind of electric current test method that tmr and rogowski coil combine

Abstract

The invention discloses a combined current testing method of TMR and Rogowski coils, using TMR (tunnel magneto resistance, Tunnel Magneto Resistance) sensors to measure steady state (medium and low frequency) and Rogowski coils (Rogowski coils) to measure pulse power current (medium and high frequency) signals Composite, to realize the full frequency band test of pulse power current; firstly, calculate the parameters, select the cable with the corresponding specification according to the measured current range, and calculate the distance between the TMR sensor and the cable; then install each component; then install the current test device System-level calibration is performed to obtain the sensitivity of the device; finally, the calibrated device is connected to the system under test, and the signals measured by the two sensors are compounded and processed. Through the design of electromagnetic shielding structure, compounding of TMR and Rogowski coils, and system-level calibration, the frequency of current testing is broadened and the effectiveness of current testing is improved.

Description

technical field [0001] The invention relates to a current testing method for combining a TMR and a Rogowski coil, in particular to a method for using a fully enclosed current testing device for combining a tunnel magnetoresistive sensor and a Rogowski coil, optical fiber charging and optical fiber data transmission, and belongs to the technical field of current testing . Background technique [0002] Pulse power current testing is an important direction in the field of current testing. Accurate testing is of great significance to the improvement of pulse power supply technology, quality improvement, and system safety testing. Current testing involving industries has become an indispensable key content in the field of testing technology. The pulse power current has the characteristics of wide frequency and large magnitude. The complex electromagnetic environment in the test environment needs to be reasonably designed in order to accurately test the pulse power current. [00...

AI Technical Summary

Problems solved by technology

The resistance shunt test needs to disconnect the measurement line, and the electrical isolation between the test system and the measured object cannot be achieved; the current transformer is affected by the iron core and cannot complete the test of a large current; the Hall sensor is easy to magnetic saturation, and the measurement Small range; Rogowski coil is the current mainstream current test sensor, no hysteresis effect, no magnetic saturation trouble, high measurement frequency, large range suitable for pulse current test, but because Rogowski coil is based on Faraday's law of electromagnetic induction and Ampere's loop law Therefore, the actual measurement of the Rogowski coil test is not suitable for the current with too low test frequency, which leads to the inaccurate data of the low-frequency magnetic field measured by the Rogowski coil

[0005] The existing Rogowski coils with low-frequency characteristics measure low-frequency current through circuits and software to restore low-frequency signals according to high-frequency characteristics, and the reliability of the measured data cannot be guaranteed.

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