Method for optimizing harmonic metering characteristics of Rogowski coil type electronic current transformer

Abstract

The invention relates to a method for optimizing harmonic metering characteristics of a Rogowski coil type electronic current transformer. The method includes the step of firstly, obtaining determining factors of coil inner-resistance, coil self-inductance, coil stray capacitance of a Rogowski coil; calculating the coil inner-resistance, coil self-inductance, coil stray capacitance of the Rogowskicoil according to each decision factor; and then quantitatively analyzing the influence of inherent parameters such as internal resistance, self-inductance and stray capacitance of the Rogowski coilon the harmonic transmission characteristic of the electronic transformer, providing technical support for process improvement, and carrying out process optimization t on the internal resistance, thecoil self-inductance and the coil stray capacitance according to the output characteristic under the corresponding higher harmonic condition. The inherent parameters of the Rogowski coil are optimizedthrough process improvement. The metering accuracy and reliability of the electronic current transformer can be improved when the frequency changes, the problem that inherent parameters of a Rogowskicoil affect the metering accuracy of the current transformer when the frequency changes in the prior art is solved, and the operation reliability of the current transformer in an intelligent substation is improved.

Description

technical field [0001] The invention relates to a method for optimizing the harmonic measurement characteristics of a Rogowski coil type electronic current transformer. Background technique [0002] The Rogowski coil type electronic current transformer has the characteristics of good measurement linearity, large dynamic range, and no magnetic saturation, and is widely used to meet the digital application requirements of smart substations. Scholars at home and abroad have conducted in-depth research on the sensing principle and structural design of Rogowski coil current transformers, the influence of distributed parameters, and group modeling calculation methods, integration methods, and the design and performance improvement of merging units, which has promoted its practical application process. These studies have shown that Rogowski coil current transformers have good steady-state and dynamic measurement performance from the perspective of measurement principles and structu...

AI Technical Summary

Problems solved by technology

[0003] The Rogowski coil is mainly composed of a ring coil that is evenly wound on a non-ferromagnetic skeleton (usually rectangular and uniform in cross section). Under the condition of high-order harmonic measurement, the internal resistance, self-inductance, stray capacitance, etc. Both the inherent parameters and the structural parameters of the external integral circuit have a certain impact on the output accuracy of the electronic current transformer, thus affecting the measurement accuracy and reliability of the power system

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