Measuring device and measuring method of reverse small current in direct current distribution system

Abstract

The invention discloses a measuring device and a measuring method of a reverse small current in a direct current distribution system. The measuring system comprises a signal acquisition system, a signal conditioning system and a data processing system which are mutually connected; the direct current is tested through the combination of a current divider and a Rogowski Coil; the Rogowski Coil is output to an integrator; when an analog integrator and a digital integrator are selected respectively, the system is slightly different; the measuring method is as follows: when in a steady state, the current divider is used for measuring current; when the current is less than a set value, the current divider and the Rogowski Coil are combined to measure small current value, namely, the value measured by the current divider is used as an integral initial value, the Rogowski Coil measures a change rate of the current, the current rate is integrated by the integrator so as to obtain current variable quantity, the current variable quantity is added to the integral initial value so as to obtain a small current value, if the value is less than 0, a control signal is output, and if the value is larger than 0, the measurement is continued. A stable current and the reverse small current in the direct current circuit can be measured precisely; and the measuring device has the advantages of wide measurement range, high precision, rapid response speed, strong overload ability, high linearity, small size and convenience for installation.

Description

technical field [0001] The invention relates to the technical field of direct current measurement, in particular to a measuring device and method for reverse small current in a direct current power distribution system. Background technique [0002] With the development of my country's economy, the modernization level of electric power, industry, transportation and other industries is getting higher and higher, and more and more regions and departments apply DC power, such as power generation and distribution systems, tractors in cities and mines, electrified tracks, chemicals, Metallurgy and defense industry, etc. [0003] With the application of direct current more and more widely, the structure of direct current grid is also more and more complex, forming a ring network structure. The ring network power supply can greatly improve the defects of single power supply and comprehensively improve the voltage quality of the user end; and when a certain part of the line fails, it...

AI Technical Summary

Problems solved by technology

The structure of the DC comparator is complex, the volume is large, and it is easily affected by the ring mirror, which does not meet the requirements of low cost and miniaturization

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