Double-face symmetric wired printed circuit board (PCB) type Rogowski coil

Abstract

The invention discloses a double-face symmetric wired printed circuit board (PCB) type Rogowski coil. The Rogowski coil comprises a PCB board, wherein the PCB board is provided with N internal diameter guide holes and N external diameter guide holes; the N internal diameter guide holes are uniformly distributed along the circumference of radius r; the N external diameter guide holes are uniformly distributed along the circumference of radius R; the circumference of the radius r is concentric with the circumference of the radius R; wired copper foils penetrate through the N internal diameter guide holes and / or the N external diameter guide holes in turn and are symmetrically arranged on the two faces of the PCB board along the radius direction; a loop line ring is wound on a wired copper foil on one face of the PCB board; and the radius Rh of the loop line ring is greater than the radius R. The double-face symmetric wired PCB type Rogowski coil provided by the invention has the advantages of high parameter consistency, reproducibility and anti-interference capacity, guarantees a stable mutual inductance coefficient, can conveniently improve the accuracy, can be used as a current sensing head for current measurement under a complex electromagnetic environment, and is easy to produce in batches.

Description

technical field [0001] The invention belongs to current transformers, in particular to an induction coil used for a sensing head of a current transformer. Background technique [0002] The Rogowski coil is a hollow coil with a special structure, which is widely used as the induction coil of the sensing head of the current detection tool of the current transformer. It has good linearity, wide measurement dynamic range, no core saturation phenomenon, output signal isolation, simple structure and The insertion loss is small and so on. [0003] The mutual inductance coefficient M between the Rogowski coil and the measured current-carrying conductor is the main parameter that determines the accuracy and sensitivity of the sensing head. The manufacture of high-precision Rogowski coils with stable mutual inductance coefficients must meet the following conditions: constant coil density, constant skeleton cross-sectional area, and coil cross-section perpendicular to the central axis...

AI Technical Summary

Problems solved by technology

This type of PCB-type Rogowski coil has simple wiring and high precision, which overcomes the shortcomings of traditional wire-wound Rogowski coils with large dispersion, but the direct-connected copper foil wiring does not form a symmetrical ring structure, and the plane where the single-turn coil is located does not completely pass through the center. axis, it is also easy to cause large dispersion; there is no loop setting, and the anti-interference performance is poor, especially the interference magnetic field perpendicular to the plane of the PCB board, which has a great impact on the performance of the sensor head

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