Broadband low-current measurement device based on isolated PCB-type Rogowski coil

Abstract

The invention discloses a broadband low-current measurement device based on an isolated PCB-type Rogowski coil. The measurement device comprises the isolated PCB-type Rogowski coil, an integral circuit, an amplifying circuit and a signal receiving device. The integral circuit is a current mode integral unit achieved through a transconductance amplifier. According to the broadband low-current measurement device, measurement of power-frequency or high-frequency high-precision low currents can be achieved, the measurement bandwidth can reach 50-20KHz, the measurement precision can reach 0.5A, and defects of a conventional Rogowski coil in low current measurement are eliminated. According to the broadband low-current measurement device, the isolated PCB-type Rogowski coil serves as a sensing head, the broadband low-current measurement device has the advantages of being easy to install, low in weight, easy to manufacture and the like, and by means of the current mode integral unit achieved through the transconductance amplifier, errors can be effectively reduced and the bandwidth is increased.

Description

technical field [0001] The invention belongs to the field of current measurement, in particular to a broadband small current measurement device based on an isolated PCB type Rogowski coil. Background technique [0002] Traditional current measuring devices mainly use electromagnetic current transformers with iron cores, which not only have large volume, narrow frequency band, and difficulty in explosion-proof insulation, but also cause the core magnetic Louis to saturate easily under high currents, resulting in large errors in measurement results. Therefore, it is difficult to meet the requirements of power system development, and a current measurement device based on other sensing mechanisms must be sought to replace it. As a kind of electronic current transformer, Rogowski coil (hereinafter referred to as Rogowski coil) current transformer has a series of advantages such as wide measurement range, high measurement accuracy, no magnetic saturation, wide frequency range, sma...

AI Technical Summary

Problems solved by technology

[0003] However, the existing Rogowski coils all have shortcomings such as low measurement accuracy and low stability. Most of the Rogowski coil measurement devices are dedicated to the measurement of large currents and high-frequency lightning currents, but ignore the low power frequency commonly used in distribution networks. current measurement

There are few existing Rogowski coil measuring devices that can be used for low-frequency and small current measurement, and they do not have the advantages of easy installation and fabrication, so they cannot meet the needs of production and construction

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