Short-time slowly-varying high-current measuring device based on (printed circuit board) PCB type Rogowski coil

Abstract

The invention discloses a short-time slowly-varying high-current measuring device based on a (printed circuit board) PCB type Rogowski coil, and the short-time slowly-varying high-current measuring device comprises the PCB type Rogowski coil, a sampling resistor and signal receiving equipment, wherein an inertialess link integrating circuit and a variable interval (VI) switching circuit are additionally and successively arranged between the PCB type Rogowski coil and the sampling resistor; and the PCB type Rogowski coil is a PCB type Rogowski coil which is provided with symmetrically arranged wires on two faces and is provided with return wires. The short time slowly-varying high-current measuring device has the advantages that direct currents or low frequency high currents can be detected, the measuring bandwidth of the short time slowly-varying high-current measuring device can reach up to DC swung dash 200kHz, and the deficiencies of a conventional current sensor on the aspect of measurement of the direct currents or the low frequency high currents are eliminated; and since the PCB type Rogowski coil which is provided with the symmetrically arranged wires and is provided with the return wires is adopted by the short time slowly-varying high-current measuring device as a sensing head, complex electromagnetic interferences in a high-current system can be effectively eliminated, and a full-analog signal transmission manner is adopted by the device, so measurement errors can be effectively reduced.

Description

technical field [0001] The invention relates to a current measuring device, in particular to a short-time slowly changing large current measuring device based on a PCB-type Rogowski coil, which is used for measuring a short-time non-periodic slowly changing large current in a complex electromagnetic environment. Background technique [0002] The current linear induction motor adopts the short-term power supply method of segmental work, such as: the linear induction motor used as a propulsion machine for high-power density systems such as maglev trains and electromagnetic launches, and its operating current has a large amplitude (up to tens of kA). , The frequency is low (DC ~ 80Hz), the duration is short (usually a few seconds to more than ten seconds) and the current is a non-periodic signal. Due to the large current amplitude, there is a defect of saturation distortion when using a current sensor with an iron core such as a Hall coil; although the working duration is short...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a method for measuring short-time aperiodic slow-changing large currents in complex electromagnetic environments.

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