System and method for monitoring gas and temperature in transformer oil based on pure optical fiber sensing

Abstract

The invention discloses a system and method for monitoring gas and temperature in transformer oil based on pure optical fiber sensing. The system comprises a sensor, an internal optical fiber, a penetrating device, a flange plate, an external optical fiber and a monitoring host; the sensor and the internal optical fiber which installed in a traction transformer form an integrated body; and a sensor probe is installed at a measuring point and is connected to the penetrating device installed on the flange plate through the internal optical fiber; the flange plate is mounted on the wall of the traction transformer; the exterior of the penetrating device is connected to the monitoring host for analysis and diagnosis through an external optical fiber mounted outside the traction transformer; the monitoring host monitors, analyzes and diagnoses the temperature change of each monitoring point of the traction transformer and the concentration content of hydrogen in the oil, and uploads monitoring data and diagnosis results to an integrated automation system or an auxiliary monitoring system in a substation. According to the system and method of the invention, the number of the parts and the size of the whole system can be decreased; a pure optical fiber technology is adopted to realize maintenance-free operation; and through comprehensive analysis and diagnosis of the temperature and the hydrogen content, the false alarm rate is reduced, and the data validity and real-time performance are improved.

Description

technical field [0001] The invention relates to the technical field of on-line monitoring of traction transformers, in particular to a system and method for monitoring gas and temperature in transformer oil based on pure optical fiber sensing. Background technique [0002] For rail vehicles, the traction transformer is one of the most important equipment and the core part of the entire electric traction system. Its normal operation or not has a great impact on ensuring the stable operation of rail vehicles such as locomotives and high-speed rail. There are several different monitoring principles for on-line monitoring of oil-immersed traction transformer status. The most commonly used ones are gas and water content monitoring in oil, internal partial discharge monitoring, iron core grounding current and so on. At present, the most widely used online monitoring equipment for traction transformers is the temperature measurement of gas in the traction transformer oil and optica...

AI Technical Summary

Problems solved by technology

However, the optical fiber temperature measurement reflects the real-time temperature measurement, and it cannot play a preventive monitoring role for latent faults.

However, gas-in-oil monitoring products that can detect latent faults do not have real-time performance, so it is necessary to combine the measurement data of the two

However, in the existing online monitoring system, these online monitoring data are still in the stage of decentralized monitoring

One monitoring quantity corresponds to one monitoring device, one device corresponds to one system, and each system is independent of each other, without any information interaction with the computer monitoring system, forming islands of information, so that online monitoring does not play its due role. Not only lack of real-time and effectiveness, but also because of the lack of relatively professional and comprehensive diagnosis, the false alarm rate has been high

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