Fault early-warning system of optical fiber current sensor

Abstract

The invention discloses a fault early- warning system of an optical fiber current sensor. The fault early- warning system comprises a fault monitoring unit and a fault information early warning unit which are connected. The fault monitoring unit is connected with a to-be-detected optical fiber current sensor, monitors state parameters of the to-be-detected optical fiber current sensor, and sends the state parameters to the fault information early warning unit. And the fault information early warning unit performs early warning judgment on each state parameter based on the early warning rule corresponding to each state parameter, and executes a responsive early warning action according to an early warning judgment result to complete fault early warning of the optical fiber current sensor. According to the invention, by demodulating the working states, such as the light source polarization characteristic, the light source output wavelength and the modulation depth of the optical fiber current sensor, of all important devices in the operation process of the optical fiber current sensor and further analyzing the state of the optical fiber current sensor, intelligent state development trend analysis is formed; fault early warning, fault alarming, troubleshooting scheme making and the like are carried out.

Description

technical field [0001] The invention belongs to the technical field of real-time monitoring and fault early warning of current sensors, and in particular relates to a fault early warning system suitable for optical fiber current sensors. Background technique [0002] Current measurement is widely used in power transmission, metallurgy, military, scientific research and other industries, and is a common and important measurement parameter in industrial production processes. Fiber Optical Current Sensor (FOCS) is a passive current transformer based on Faraday's magneto-optical effect principle. It has the advantages of small size, light weight, simple insulation structure, and large dynamic range of measurement. It has been widely used in engineering. However, in its actual operation, the all-fiber-optic current sensor is susceptible to various factors such as temperature, vibration, interference, and optical path loss, especially for photoelectric devices such as light sourc...

AI Technical Summary

Problems solved by technology

However, in its actual operation, the all-fiber current sensor is susceptible to various factors such as temperature, vibration, interference, and optical path loss, especially for photoelectric devices such as light sources, photodetectors, and photoelectric modulators. Aging is prone to occur under the influence of hot and humid environments, resulting in a decrease in measurement accuracy and even failure events, which will cause abnormalities in the control and protection system and seriously affect the safe and stable operation of the converter station

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