Rogowski coil based on coaxial cable framework

Abstract

The invention discloses a Rogowski coil based on a coaxial cable framework. The Rogowski coil is manufactured by taking a coaxial cable from which a shielding layer is removed as a framework, taking a core wire of the coaxial cable as an unrolling wire, and uniformly winding the framework with an enameled wire. The obtained coil is arranged in an insulating bush. An active differential integrating circuit is taken as an integrating unit, and an external power supply is used for supplying power, so that a measurement frequency band of the Rogowski coil can be expanded effectively, and a current differential signal output by the Rogowski coil is reduced. A signal processing unit is used for transmitting data to a protection channel and a metering system through an output interface circuit. The Rogowski coil has high flexibility, is provided an opening, can be suitable for various complex application fields, is low in cost, is easy to manufacture, is easy for realizing mass production, and has high consistency. By adopting the Rogowski coil, high-accuracy measurement of steady-state signals and rapid response to transient signals can be realized, nanosecond high-amplitude pulse current can be measured, and very high temperature stability and vibration resistance are achieved.

Description

technical field [0001] The invention belongs to the technical field of pulse power, and more specifically relates to a Rogowski coil based on a coaxial cable skeleton. Background technique [0002] Rogowski coil, also known as air core transformer (AirCoilTransformer) or magnetometer (Potentiometer), because it has no direct electrical contact with the measured current loop, wide frequency band, low output power, simple structure, and good linearity , and easy to communicate with the computer, it has become the first choice sensitive device for high-voltage on-site measurement of AC, transient and pulse and other large currents of different natures. Rogowski coils can be divided into two types: self-integrating and external integrating. When the voltage drop on the total resistance of the loop is much smaller than the voltage drop on the self-inductance of the coil, the Rogowski coil works in the self-integrating state, and the self-integrating Rogowski coil generally works ...

AI Technical Summary

Problems solved by technology

[0003] The traditional magnetic core Rogowski coil is affected by the magnetic core, which has problems such as narrow frequency band and magnetic saturation. At the same time, due to the influence of the magnetic core on the volume, its use conditions are limited; the hollow Rogowski coil does not have the problem of magnetic saturation, and the measurement frequency bandwidth is wide , large dynamic measurement range, simple structure, small size, light weight, low cost, but also has disadvantages that cannot be ignored, such as low toughness, small output signal, low signal-to-noise ratio, etc.

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