High-sensitivity miniaturized current detection system

Abstract

The invention relates to the technical field of current detection in a high-voltage power transmission line, and provides a high-sensitivity miniaturized current detection system. The system comprisesa light source, an optical fiber current sensor and a detector, wherein the optical fiber current sensor is composed of an input light-guide fiber, an input lens, an input polarizing film, a magneto-optical material wrapped by a gold film, an output polarizing film, an output lens and an output light-guide fiber; when the current on the to-be-measured high-voltage transmission conductor is measured, the light source emits non-polarized light, the non-polarized light is input into the optical fiber current sensor and transmitted to the detector through the optical fiber, the magnetic field intensity B is calculated through the Faraday magneto-optical effect and the Malus theorem, and the current intensity I of the to-be-measured conductor is calculated according to the Biot-Savart theoremand the magnetic field intensity B. The problems that a current detection method in the prior art is large in size, heavy in weight and prone to being interfered by exciting current, and the current detection methods in the prior art are all not high in detection sensitivity are solved.

Description

technical field [0001] The invention relates to the technical field of current detection in high-voltage transmission lines, in particular to a high-sensitivity miniaturized current detection system, which uses optical fiber sensing technology to quickly detect current in wires, and is suitable for real-time detection of high-voltage transmission line current. Background technique [0002] Current detection methods commonly used in the prior art include the following methods: [0003] Shunt: The principle of the shunt is simple, and it is usually used in low-frequency and small-amplitude current measurement, but when it is applied to high-frequency and large-value current measurement, a large error will occur. [0004] AC current transformer: AC current transformer has a simple sensing principle and high precision. However, AC current transformers are only suitable for AC current measurement within thousands of amperes. If the measured current is too large, the excitation c...

AI Technical Summary

Problems solved by technology

Its disadvantage is that it is larger in size, higher in price, and needs the support of external power supply, etc.

[0006] Hall current sensor, Hall current sensor is a commonly used current measuring device, it uses Hall elements as the sensing unit, and realizes the measurement of current through the magnitude of the magnetic field generated by the measured current, which is applied to the measurement of large flow , but the device has the disadvantages of large size and heavy weight

[0007] To sum up, the current detection methods in the prior art have the disadvantages of large volume, heavy weight, and being easily disturbed by the excitation current, and the current detection methods in the prior art also have low detection sensitivity

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