High-precision current measurement system based on toroidal magnetic field sensing array

Abstract

Disclosed is a high-precision current measurement system based on a toroidal magnetic field sensing array. Circuit current is measured by adopting the toroidal magnetic field sensing array, the toroidal magnetic field sensing array is composed of a plurality of sensors which are evenly distributed on bases of all vertices of an inscribed regular polygon of a ring, and each base can be driven by arotating motor to rotate by any angle on a plane where the sensing array is located. The high-precision current measurement system based on the toroidal magnetic field sensing array has high capability of resisting adjacent-phase current interference, and the measurement accuracy during primary conductor eccentricity is greatly improved. In the presence of adjacent-phase wire current interference,the number n of the sensors is greater than or equal to 8, when the ratio of a wire spacing to the sensing array is greater than 2.37, the measurement error is smaller than 0.1%, and the accuracy requirement is met; by adopting a novel sensor rotation measurement method, the measurement error during primary conductor eccentricity can be reduced to be smaller than 0.1% from 0.6%, the measurement error during eccentricity is greatly reduced, and therefore the accuracy requirement is met.

Description

technical field [0001] The invention provides a high-precision current measurement system based on a ring-shaped magnetic field sensor array, which is used for real-time and accurate measurement of current signals of transmission lines in intelligent substations. Background technique [0002] Current measurement is very important for judging the operating status of equipment connected to the line. Through the measurement of line current, parameters such as current amplitude, phase, waveform, and harmonic content can be obtained in a timely and accurate manner, which can reflect and evaluate the operating status of line equipment in real time, and then Propose reasonable maintenance or countermeasures. [0003] At present, there are roughly the following methods for monitoring line current: electromagnetic transformers, optical sensors, and air-core coils. Electromagnetic transformers are large in size and heavy in weight, unable to measure DC, and are prone to problems such...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the current line current measurement method is single, the measurement accuracy is not high, and it is generally impossible to measure DC current, the present invention proposes a ring-based magnetic field sensor with simple structure, good reliability, high measurement accuracy and the ability to measure DC. Array high precision current measurement system

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