Shunt impedance parameter determining method for measuring transient current

Abstract

The invention discloses a shunt impedance parameter determining method for measuring a transient current, and solves a problem that a conventional miniature impedance determining method cannot accurately measure a shunt impedance parameter because of low measurement precision. The method employs a variable frequency AC current source, a multi-purpose meter, a lock-in amplifier, a reference impedance element, and an RLC analyzer which is used for measuring an impedance angle of the reference impedance element. The reference impedance element should meet requirements that a relative error can be neglected when the RLC analyzer is used for measuring an impedance value and the impedance angle can be obtained accurately. The method provided by the invention provides a solution to a problem that a conventional RLC analyzer or network analyzer cannot precisely determine an impedance parameter of a shunt because the impedance parameter of the shunt is too small. The method can precisely determine the shunt impedance parameters at different frequency points according to a frequency component of the transient current, is good in determining results of the shunt impedance parameters, and is accurate and reliable.

Description

technical field [0001] The invention relates to a method for determining impedance parameters of a shunt used for transient current measurement, and belongs to the field of electrical measurement. Background technique [0002] The shunt is an important current sensor in the field of electrical engineering, and it is often used for large current measurement. When measuring a constant current, the circuit model of the shunt is a resistor, and the resistance value is the calibration value of the manufacturer. When the measured current passes through the shunt, divide the voltage signal output by the shunt by the resistance value of the shunt to obtain the measured current; The state current is a non-constant current whose amplitude changes with time, which can be decomposed into sinusoidal current components of different frequencies. When measuring the transient current, the shunt circuit model is usually a series connection of resistance and inductance, and the resistance and ...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a shunt impedance parameter determination method for transient current measurement, which solves the technical problem that the existing micro impedance determination method cannot accurately measure the shunt impedance parameter due to low measurement accuracy

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